Date   

Re: SSTV

Paul Young <paul@...>
 

Here in the UK i hear SSTV on 14.230 most of the day
I upload what I rx live to my website 24/7
 
Paul G0HWC
 
Check out my website  www.g0hwc.com     *Echolink node MB7ICL-L  "381900"*


ARRL/TAPR Digital Communication Conference, Chicago, September 26 - 28

Mark Thompson <wb9qzb@...>
 

 
ARRL, TAPR Prepare for Digital Communications Conference in Chicago, September 26 - 28

 

Aficionados of digital communications are gearing up for the 27th annual ARRL/TAPR Digital Communications Conference (DCC) September 26-28 in Chicago, Illinois. The ARRL/TAPR Digital Communications Conference is an international forum for radio amateurs to meet, publish their work and present new ideas and techniques. Presenters and attendees will have the opportunity to exchange ideas and learn about recent hardware and software advances, theories, experimental results, and practical applications. The DCC is for all levels of technical experience -- not just for the expert. Not only is the conference technically stimulating, it is a weekend of fun for all who have more than a casual interest in any aspect of amateur digital electronics and communications; introductory sessions are scheduled throughout the conference to introduce new technical topics for both beginners and experts.

 

Topics at the DCC include, but are not limited to: Software defined radio (SDR); digital voice (D-STAR, P25, WinDRM, FDMDV, G4GUO); digital satellite communications; Global Position System (GPS); precision timing; Automatic Position Reporting System (APRS); short messaging (a mode of APRS); Digital Signal Processing (DSP); HF digital modes; Internet interoperability with Amateur Radio networks; spread spectrum; IEEE 802.11 and other Part 15 license-exempt systems adaptable for Amateur Radio; using TCP/IP networking over Amateur Radio; mesh and peer-to-peer wireless networking; emergency and Homeland Defense backup digital communications; using Linux in Amateur Radio; updates on AX.25, and other wireless networking protocols.

 

QEX Editor Larry Wolfgang, WR1B, will represent the ARRL at the Conference. He will also be giving a talk "Writing for Publication -- It's Not Rocket Science (Even if You Are Writing About Rocket Science!)." Retired ARRL Chief Technology Officer Paul Rinaldo, W4RI, will also represent the League. Rinaldo will speak on "SDR Outlook."

 

The DCC provides a separate (and lockable) room for participants to bring and show off their latest projects. Tables and power will be provided. Participants are encouraged to bring their own equipment and display for all to see, learn, and ask questions about, as well as a small sign and/or flyer naming and describing their project.

 

D-STAR digital voice and data will be the focus of the DCC Friday evening session. Pioneers and leaders in D-STAR digital voice and data technology will be presenting the technical innovations in D-STAR and how it is being used worldwide. In addition to the Friday evening session, ICOM will be at the DCC demonstrating D-STAR radios in the demonstration room, and TAPR's 70 cm and 23 cm D-STAR digital voice and data repeaters (KT7APR) with Internet gateway will be on the air.

 

Sunday Seminar Speaker Announced

 

Each year, the DCC hosts an in-depth 4 hour seminar on Sunday. Past seminars have included such topics as Software Defined Radios, Spread Spectrum Design and Theory, RD Design and Deployment, PICmicro MCU Design and Development, Packet Radio Networks with Millions or Billions of Stations and others. Seminars are given by experts in their field -- this year is no different. Phil Harman, VK6APH, will present "Software Radio Through the Looking-Glass."

 

Harman, licensed for more than 40 years, has worked on leading-edge RF techniques related to receivers and transmitters. His current passion is the development of fully digital HF radios. Harmon co-writes the Software Defined Radio column in the RSGB Radio Communications journal and also co-authored the SDR chapter in the latest RSGB Handbook. He will guide participants through the basics of SDRs right up to the very latest techniques that digitize signals directly at the antenna socket. Using diagrams and a minimum of math, Harmon will cover such subjects as front end design, mixers, I and Q signals, digital up and down conversion, AGC techniques, noise blanking and high efficiency power amplifiers. The presentation will be highly interactive, so be sure to bring along that question that has been puzzling you for so long!

 

Conference presentations, meetings, and seminars will be held at the Holiday Inn Hotel Elk Grove Village, Illinois. It is highly recommended that participants book rooms prior to arriving. A block of rooms at the special DCC room rate of $89.00 single/double is available; this rate is good until the block is all sold out. The hotel provides a complimentary shuttle to and from O'Hare Airport.

 

Register for the DCC at: www.tapr.org/dcc

 



Re: High speed packet

José A. Amador <amador@...>
 

Going too fast on a serial port is not always a bonus. If there are errors, it is another source of retries, without even reaching the air.

Go only as fast as it makes sense with very few or no errors. YMMV.

Jose, CO2JA

---

Bob Donnell escribi�:

Martin:

I'd bet you were thinking of ISA instead of IDE - and probably the
dual opto-SCC card developed by your countrymen back then.

Ross:

JNOS is probably the most actively maintained version of NET which
became NOS, back in about 1990/1991 time frame. Current versions of
it can be run under either Windows or Linux. JNOS has KISS as one of
its historic interface methods. As long as you have a more modern
serial communications chip in the computer you're using
(16550-compatible) you should be able to configure it to have
adequate communications with the TNC at either 57.6kbps or 115.5kbps,
if the TNC supports it.

The SV2AGW family of programs may also support that fast serial data
rate - I don't have an easy way to check where I'm entering this
email. The AGW Packet Engine (AGWPE) definitly also understands how
to do KISS. My home Airmail station is using a shim to talk to
AGWPE, which is talking to an AEA PK-96 using KISS, which is then
interfaced with the radio.

Perhaps I've not been watching the list carefully - what over-the-air
data rate are you using that makes performing serial communications
at 57.6kbps an advantage? Unless you're sending quite large AX.25
packets (1k or 2k) on a radio link at 38.4kbps, there's probably not
much performance advantage to going that fast. And if your on-air
data rate IS that fast, congratulations!

73

Bob, KD7NM

-----Original Message----- From: digitalradio@yahoogroups.com
[mailto:digitalradio@yahoogroups.com] On Behalf Of martin beekhuis
Sent: Tuesday, September 09, 2008 11:38 AM To:
digitalradio@yahoogroups.com Subject: [digitalradio] Re: High speed
packet

Hello Ross

Here we have already for years running the packetnode using ax25
drivers in linux. http://sharon.esrac.ele.tue.nl (sorry in dutch)
Different speed up to 76800 however we use SCC IDE controlers I think
via the serial port ttyS0 ax0 will do also.

Before we switched from DOS-6.11 to linux we used NOS or NET

No GUI all very basic but reliable from 1987 till now

73 matin pa3dsc


I am looking for a packet program, which I can use to operate my
Symek TNC3S at 57600
but which has the kiss mode. Any one any ideas.

Packet was in favour a few years ago and all the programs I can
find
are very old, dont like the kiss mode,
or cant talk to the TNC3S at 57600.

Regards to all Ross ZL1WN .


------------------------------------

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http://www.obriensweb.com/sked

Yahoo! Groups Links






------------------------------------

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http://www.obriensweb.com/sked

Yahoo! Groups Links

--
MSc. Ing. Jos� Angel Amador Fundora
Profesor Auxiliar
Departamento de Telecomunicaciones
Facultad de Ing. El�ctrica, CUJAE
Calle 114 # 11901 e/119 y 127
Marianao 19390
Ciudad de la Habana, Cuba
Tel: (53 7) 266-3445
Mail: amador at electrica.cujae.edu.cu


SSTV

Fred VE3FAL <flesnick@...>
 

Been monitoring 14.230 all day, heard some SSB up just a bit and was W1AW using voice..

 

Fred

VE3FAL


Re: Noise

José A. Amador <amador@...>
 

It is usually so, but there are also return channels to the headend below 54 MHz in some places.

A loose conector or a broken shield might allow it to leak out.

73,

Jose, CO2JA

--

John Taylor escribi�:

Ron, as a semi direct answer to your question, as a general rule cable tv frequencies typically are well above hf radio. It is not impossible for there to be interference, but generally it will be some other source. One thing to remember with most cable systems is that the line and trunk amps need to be powered and are usualy done through the cable itself with pole mounted power supplies every so often in the system. If there is a connection breakdown somewhere near you, it"could" cause your symptoms. You did provide a clue to your own situation. You mentioned a bucket truck in the area when the noise suddenly stopped and then started again. If he was working at a particular pole, you might try physically walking to that pole and see if you hear any arcing, especially if this is also a power pole carrying primary voltages. It is not uncommon for the insulators to start breaking down due to dirt and grime in the air getting on the insulators and forming a path for the current to travel. This manifests itself frequently as strong intermittant static.
Your noise blanker typically only works on "impulse" noise such as ignition, etc. Have you also eliminated all noise sources in your own home, such as televisions, computers and monitors, etc.?
A great way to chase the source is to take a small portable shortwave receiver with a small antenna and follow the noise to it's source. You can usually get very close very quickly with a little leg work.
Just some thoughts ....
Best of Luck

--- In digitalradio@yahoogroups.com, w4lde <w4lde@...> wrote:

If this question is inappropriate for the reflector I apologize but
as
of last Friday I started to experience significant noise (S-9) on
all
bands from 160 through 15M with the lower frequencies much
stronger. I
thought that it was due to power line noise but it appears to be intermittent in that it completely disappeared last Friday evening
but
once again showed up last Saturday and stayed this way. On the
Ft1000mp
the noise blankers are completely ineffective. At the same time I started having internet problems and the cable company indicated
they
should have the speed issue fixed by Tuesday.

The cables are run on poles until they enter a subdivision which
then
run underground. My question is can cable lines be the possible
problem
to HF frequencies? The power and cable companies have been
installing
new poles and running new lines in the area which initially led me
to
believe it was a power issue however, while I was writing this
email the
noise completely disappeared for a few seconds and then
reappeared. As
I was looking out my window I noticed a cable company buck truck through the woods towards the main road, I am off now to talk to
them
and see what I can discover. Any suggestions?

Thanks for the bandwidth if this question is inappropriate for this reflector.

73 de
Ron W4LDE



------------------------------------

Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

Yahoo! Groups Links



--
MSc. Ing. Jos� Angel Amador Fundora
Profesor Auxiliar
Departamento de Telecomunicaciones
Facultad de Ing. El�ctrica, CUJAE
Calle 114 # 11901 e/119 y 127
Marianao 19390
Ciudad de la Habana, Cuba
Tel: (53 7) 266-3445
Mail: amador at electrica.cujae.edu.cu


Re: Noise

George Csahanin
 

A couple of things from experience...

First, cable internet service does use HF frequencies. I forget which direction is down there, but one is.

Second, your power company is a rare find these days. Ten years back it seems most truimmed the "fixit" guys to cut expenses. I've gone thru it with two power companies now. Time was when all power companies did just that, look for problems. If it is an insulator breaking down, for example, that's current being spent that isn't being billed to anyone. Add up enough of it and its real money to them.

but wideband noise like that may not be power company related. Here at my place I've had that now for a few years, making HF pretty useless. But don't discount wall warts. Most of them now are switchers, and make lots of noise. Just not wideband constant level noise so much. And since the energy bill last year, more to come, the feds now mandate efficiency of those things.

My two cents.

GeorgeC
W2DB


Re: Noise

w4lde
 

Bill,

Thanks for the info, well we have eliminated our home and all others in the neighborhood, wish it was ours or theres, however, on the good side is that I received a call from the Manager of Maintenance from our local power company today and he stated don't worry we will find and fix the problem. We have the equipment to track down the source and it not uncommon for this to happen. We spoke for quite some time and he told me of things they have found and how they fixed it. One was a staple driven through a doorbell chime line to the doorbell switch, another a loss connection from the cable co to there ground, I got a lesson listing. I was taken back since he told me he has two crews whom are 100% assigned to finding and helping with these issues. Wow I thought a power company that really wants to help! Took me back to the good old days of good customer service and stated they would try to get to the problem tomorrow and at the latest on Friday

I have an uneasy felling that it has to do with the local cable company who have been replacing lines the whole week on a main road not to far from me. That's were I find the greatest noise coming from and I am hoping for a quick and easy fix, time will tell.

Keep you and the group posted, one thing I have learned is that digital communications can still get through while SSB and or CW have a tough time with these old ears.

Again thanks for the advice.

73 de
Ron W4LDE


Bill P. wrote:


Having experienced something like this last year, a fried eggs
sizzling noise I tried many recommendations. BTW, our utilities are
underground. Eliminate your house as the source of the problem by
running your rig from a battery and shut off the house circuit
breakers, everything. Don't overlook a bad PC UPS and poor wall wart
power supplies.

Ok, maybe the noise is not in your house, now put your hiking boots on
and walk the neighborhood with headphones, a FT817 and whip antenna.
Someone told me that AM on 138Mhz was best for finding noise, I cannot
be sure of that but I sure did find a lot of weird stuff, houses
making buzzing noises, street intersections with screeching noises
.... It actually became very interesting and confusing. I put many
nights into walking the neighborhood and beyond since none of the
noises I heard to date traveled very far. Suddenly the noise at my
rig went away and never returned. I can only imagine it was a
neighbors electric blanket or fish tank heater ... or maybe something
caught fire and burnt itself out. Anyway, I won't miss poking at
around houses with the whip to seek out electrical noises. Bill k6acj

--- In digitalradio@yahoogroups.com <mailto:digitalradio%40yahoogroups.com>, w4lde <w4lde@...> wrote:

If this question is inappropriate for the reflector I apologize but as
of last Friday I started to experience significant noise (S-9) on all
bands from 160 through 15M with the lower frequencies much stronger. I
thought that it was due to power line noise but it appears to be
intermittent in that it completely disappeared last Friday evening but
once again showed up last Saturday and stayed this way. On the
Ft1000mp
the noise blankers are completely ineffective. At the same time I
started having internet problems and the cable company indicated they
should have the speed issue fixed by Tuesday.

The cables are run on poles until they enter a subdivision which then
run underground. My question is can cable lines be the possible
problem
to HF frequencies? The power and cable companies have been installing
new poles and running new lines in the area which initially led me to
believe it was a power issue however, while I was writing this email
the
noise completely disappeared for a few seconds and then reappeared. As
I was looking out my window I noticed a cable company buck truck
through the woods towards the main road, I am off now to talk to them
and see what I can discover. Any suggestions?

Thanks for the bandwidth if this question is inappropriate for this
reflector.

73 de
Ron W4LDE


Re: Noise

Bill P.
 

Having experienced something like this last year, a fried eggs
sizzling noise I tried many recommendations. BTW, our utilities are
underground. Eliminate your house as the source of the problem by
running your rig from a battery and shut off the house circuit
breakers, everything. Don't overlook a bad PC UPS and poor wall wart
power supplies.

Ok, maybe the noise is not in your house, now put your hiking boots on
and walk the neighborhood with headphones, a FT817 and whip antenna.
Someone told me that AM on 138Mhz was best for finding noise, I cannot
be sure of that but I sure did find a lot of weird stuff, houses
making buzzing noises, street intersections with screeching noises
.... It actually became very interesting and confusing. I put many
nights into walking the neighborhood and beyond since none of the
noises I heard to date traveled very far. Suddenly the noise at my
rig went away and never returned. I can only imagine it was a
neighbors electric blanket or fish tank heater ... or maybe something
caught fire and burnt itself out. Anyway, I won't miss poking at
around houses with the whip to seek out electrical noises. Bill k6acj

--- In digitalradio@yahoogroups.com, w4lde <w4lde@...> wrote:

If this question is inappropriate for the reflector I apologize but as
of last Friday I started to experience significant noise (S-9) on all
bands from 160 through 15M with the lower frequencies much stronger. I
thought that it was due to power line noise but it appears to be
intermittent in that it completely disappeared last Friday evening but
once again showed up last Saturday and stayed this way. On the
Ft1000mp
the noise blankers are completely ineffective. At the same time I
started having internet problems and the cable company indicated they
should have the speed issue fixed by Tuesday.

The cables are run on poles until they enter a subdivision which then
run underground. My question is can cable lines be the possible
problem
to HF frequencies? The power and cable companies have been installing
new poles and running new lines in the area which initially led me to
believe it was a power issue however, while I was writing this email
the
noise completely disappeared for a few seconds and then reappeared. As
I was looking out my window I noticed a cable company buck truck
through the woods towards the main road, I am off now to talk to them
and see what I can discover. Any suggestions?

Thanks for the bandwidth if this question is inappropriate for this
reflector.

73 de
Ron W4LDE


PSK31 o 60M !

Andrew O'Brien
 

Interesting from DX Watch spots, mistake ?


VE3YXO KA2OEG 5374.8 BPSK31 0237z 08 Sep
VE3YXO K0OD 5374.8 BPSK31 0234z 08 Sep

--
Andy K3UK


Re: Noise

John Taylor <ke5ham3@...>
 

Ron, as a semi direct answer to your question, as a general rule
cable tv frequencies typically are well above hf radio. It is not
impossible for there to be interference, but generally it will be
some other source. One thing to remember with most cable systems is
that the line and trunk amps need to be powered and are usualy done
through the cable itself with pole mounted power supplies every so
often in the system. If there is a connection breakdown somewhere
near you, it"could" cause your symptoms. You did provide a clue to
your own situation. You mentioned a bucket truck in the area when the
noise suddenly stopped and then started again. If he was working at a
particular pole, you might try physically walking to that pole and
see if you hear any arcing, especially if this is also a power pole
carrying primary voltages. It is not uncommon for the insulators to
start breaking down due to dirt and grime in the air getting on the
insulators and forming a path for the current to travel. This
manifests itself frequently as strong intermittant static.
Your noise blanker typically only works on "impulse" noise such as
ignition, etc.
Have you also eliminated all noise sources in your own home, such as
televisions, computers and monitors, etc.?
A great way to chase the source is to take a small portable shortwave
receiver with a small antenna and follow the noise to it's source.
You can usually get very close very quickly with a little leg work.
Just some thoughts ....
Best of Luck

--- In digitalradio@yahoogroups.com, w4lde <w4lde@...> wrote:

If this question is inappropriate for the reflector I apologize but
as
of last Friday I started to experience significant noise (S-9) on
all
bands from 160 through 15M with the lower frequencies much
stronger. I
thought that it was due to power line noise but it appears to be
intermittent in that it completely disappeared last Friday evening
but
once again showed up last Saturday and stayed this way. On the
Ft1000mp
the noise blankers are completely ineffective. At the same time I
started having internet problems and the cable company indicated
they
should have the speed issue fixed by Tuesday.

The cables are run on poles until they enter a subdivision which
then
run underground. My question is can cable lines be the possible
problem
to HF frequencies? The power and cable companies have been
installing
new poles and running new lines in the area which initially led me
to
believe it was a power issue however, while I was writing this
email the
noise completely disappeared for a few seconds and then
reappeared. As
I was looking out my window I noticed a cable company buck truck
through the woods towards the main road, I am off now to talk to
them
and see what I can discover. Any suggestions?

Thanks for the bandwidth if this question is inappropriate for this
reflector.

73 de
Ron W4LDE


Re: High speed packet

Ross <rbiggar@...>
 

Thanks for the comments.
Bob, I have had a Symek TNC3S sitting on the shelf  looking at me for a few years.
So I decided it was time to check it and see if it still worked.
It was used for satellite telemetry downlink high speed.
 
Regards
Ross

Sent: Wednesday, September 10, 2008 7:47 AM
Subject: RE: [digitalradio] Re: High speed packet

Martin:

I'd bet you were thinking of ISA instead of IDE - and probably the dual
opto-SCC card developed by your countrymen back then.

Ross:

JNOS is probably the most actively maintained version of NET which became
NOS, back in about 1990/1991 time frame. Current versions of it can be run
under either Windows or Linux. JNOS has KISS as one of its historic
interface methods. As long as you have a more modern serial communications
chip in the computer you're using (16550-compatible) you should be able to
configure it to have adequate communications with the TNC at either 57.6kbps
or 115.5kbps, if the TNC supports it.

The SV2AGW family of programs may also support that fast serial data rate -
I don't have an easy way to check where I'm entering this email. The AGW
Packet Engine (AGWPE) definitly also understands how to do KISS. My home
Airmail station is using a shim to talk to AGWPE, which is talking to an AEA
PK-96 using KISS, which is then interfaced with the radio.

Perhaps I've not been watching the list carefully - what over-the-air data
rate are you using that makes performing serial communications at 57.6kbps
an advantage? Unless you're sending quite large AX.25 packets (1k or 2k) on
a radio link at 38.4kbps, there's probably not much performance advantage to
going that fast. And if your on-air data rate IS that fast,
congratulations!

73

Bob, KD7NM

-----Original Message-----
From: digitalradio@yahoogroups.com [mailto:digitalradio@yahoogroups.com] On
Behalf Of martin beekhuis
Sent: Tuesday, September 09, 2008 11:38 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: High speed packet

Hello Ross

Here we have already for years running the packetnode using ax25 drivers in
linux. http://sharon.esrac.ele.tue.nl (sorry in dutch) Different speed up
to 76800 however we use SCC IDE controlers I think via the serial port ttyS0
ax0 will do also.

Before we switched from DOS-6.11 to linux we used NOS or NET

No GUI all very basic but reliable from 1987 till now

73 matin pa3dsc


>
> I am looking for a packet program, which I can use to operate my
Symek TNC3S at 57600
> but which has the kiss mode.
> Any one any ideas.
>
> Packet was in favour a few years ago and all the programs I can find
are very old, dont like the kiss mode,
> or cant talk to the TNC3S at 57600.
>
> Regards to all
> Ross
> ZL1WN
> .
>

------------------------------------

Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

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__________ Information from ESET NOD32 Antivirus, version of virus signature database 3429 (20080909) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com


Re: High speed packet

Lee <kd4gcf@...>
 

Have you tried Outpost or Winpack. Outpost is a newer program and
Winpack has some age. The AGWpe software may be needed to bridge these
programs. I will be using a uTNT, in kiss, with AGWpe and Winpack some.

73,
Lee

--- In digitalradio@yahoogroups.com, "Ross" <rbiggar@...> wrote:

I am looking for a packet program, which I can use to operate my
Symek TNC3S at 57600
but which has the kiss mode.
Any one any ideas.

Packet was in favour a few years ago and all the programs I can find
are very old, dont like the kiss mode,
or cant talk to the TNC3S at 57600.

Regards to all
Ross
ZL1WN
.


Re: High speed packet

Bob Donnell <kd7nm@...>
 

Martin:

I'd bet you were thinking of ISA instead of IDE - and probably the dual
opto-SCC card developed by your countrymen back then.

Ross:

JNOS is probably the most actively maintained version of NET which became
NOS, back in about 1990/1991 time frame. Current versions of it can be run
under either Windows or Linux. JNOS has KISS as one of its historic
interface methods. As long as you have a more modern serial communications
chip in the computer you're using (16550-compatible) you should be able to
configure it to have adequate communications with the TNC at either 57.6kbps
or 115.5kbps, if the TNC supports it.

The SV2AGW family of programs may also support that fast serial data rate -
I don't have an easy way to check where I'm entering this email. The AGW
Packet Engine (AGWPE) definitly also understands how to do KISS. My home
Airmail station is using a shim to talk to AGWPE, which is talking to an AEA
PK-96 using KISS, which is then interfaced with the radio.

Perhaps I've not been watching the list carefully - what over-the-air data
rate are you using that makes performing serial communications at 57.6kbps
an advantage? Unless you're sending quite large AX.25 packets (1k or 2k) on
a radio link at 38.4kbps, there's probably not much performance advantage to
going that fast. And if your on-air data rate IS that fast,
congratulations!

73

Bob, KD7NM

-----Original Message-----
From: digitalradio@yahoogroups.com [mailto:digitalradio@yahoogroups.com] On
Behalf Of martin beekhuis
Sent: Tuesday, September 09, 2008 11:38 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: High speed packet

Hello Ross

Here we have already for years running the packetnode using ax25 drivers in
linux. http://sharon.esrac.ele.tue.nl (sorry in dutch) Different speed up
to 76800 however we use SCC IDE controlers I think via the serial port ttyS0
ax0 will do also.

Before we switched from DOS-6.11 to linux we used NOS or NET

No GUI all very basic but reliable from 1987 till now

73 matin pa3dsc



I am looking for a packet program, which I can use to operate my
Symek TNC3S at 57600
but which has the kiss mode.
Any one any ideas.

Packet was in favour a few years ago and all the programs I can find
are very old, dont like the kiss mode,
or cant talk to the TNC3S at 57600.

Regards to all
Ross
ZL1WN
.


------------------------------------

Announce your digital presence via our Interactive Sked Page at
http://www.obriensweb.com/sked

Yahoo! Groups Links


Re: Noise

Graham
 

Ron,

One handy trick, the local 'radio inspcetor' for want of a better
name, passed on to me was ... That the closer you get to the noise
source .. the higher in frequency you can pick it up .. I had a wide
band signal taking all of 145 Mhz out ... finally tracked it down,
using a uhf 'tv' ae and my frg9600 tuned round 800 Mhz with the yagi
I managed to pin point the problem .. a chattering rely in a large
tumble dryer .. the mains cable was raditing ...

I spent ages with a hf and mw set but never managed a good fix,
signals came from all over

G ..


--- In digitalradio@yahoogroups.com, "expeditionradio"
<expeditionradio@...> wrote:

Hi Ron,

Use a portable HF receiver with a whip antenna and walk around,
track
it down by signal strength. This will find the source 90% of the
time.

Take 2 ferrites and call me in the morning...

Bonnie VR2/KQ6XA

--- In digitalradio@yahoogroups.com, w4lde <w4lde@> wrote:
I started to experience significant noise (S-9) on all
bands from 160 through 15M with the lower frequencies much
stronger.
Any suggestions?
Ron W4LDE


Re: High speed packet

martin beekhuis <pa3dsc@...>
 

Hello Ross

Here we have already for years running the packetnode using ax25
drivers in linux. http://sharon.esrac.ele.tue.nl (sorry in dutch)
Different speed up to 76800 however we use SCC IDE controlers I think
via the serial port ttyS0 ax0 will do also.

Before we switched from DOS-6.11 to linux we used NOS or NET

No GUI all very basic but reliable from 1987 till now

73 matin pa3dsc



I am looking for a packet program, which I can use to operate my
Symek TNC3S at 57600
but which has the kiss mode.
Any one any ideas.

Packet was in favour a few years ago and all the programs I can find
are very old, dont like the kiss mode,
or cant talk to the TNC3S at 57600.

Regards to all
Ross
ZL1WN
.


Re: Noise

expeditionradio
 

Hi Ron,

Use a portable HF receiver with a whip antenna and walk around, track
it down by signal strength. This will find the source 90% of the time.

Take 2 ferrites and call me in the morning...

Bonnie VR2/KQ6XA

--- In digitalradio@yahoogroups.com, w4lde <w4lde@...> wrote:
I started to experience significant noise (S-9) on all
bands from 160 through 15M with the lower frequencies much stronger.
Any suggestions?
Ron W4LDE


Noise

w4lde
 

If this question is inappropriate for the reflector I apologize but as of last Friday I started to experience significant noise (S-9) on all bands from 160 through 15M with the lower frequencies much stronger. I thought that it was due to power line noise but it appears to be intermittent in that it completely disappeared last Friday evening but once again showed up last Saturday and stayed this way. On the Ft1000mp the noise blankers are completely ineffective. At the same time I started having internet problems and the cable company indicated they should have the speed issue fixed by Tuesday.

The cables are run on poles until they enter a subdivision which then run underground. My question is can cable lines be the possible problem to HF frequencies? The power and cable companies have been installing new poles and running new lines in the area which initially led me to believe it was a power issue however, while I was writing this email the noise completely disappeared for a few seconds and then reappeared. As I was looking out my window I noticed a cable company buck truck through the woods towards the main road, I am off now to talk to them and see what I can discover. Any suggestions?

Thanks for the bandwidth if this question is inappropriate for this reflector.

73 de
Ron W4LDE


Path simulaitons - WSJT modes

Tony
 

Don,
 
> do you have tests that include JT65 or WSPR or other WSJT modes?  Wolf? 
> de kb9umt Don
 
Yes I have, but not without problems. The JT65 mode requires precise timing on the transmit/receive sequence and it's not easy to duplicate with the path simulator inline. The audio input/output becomes a problem when using one computer as well, even with virtual audio cable.  
 
I think I can overcome the timing issues by running WSJT on two computers. I'll use a time server on both PC's to make sure the timing is accurate. I've used two computers in the past to conduct path simulation tests before I found VAC.
 
The JT6M and FSK441 tests went smoothly since precise timing is not an issue with these two. I've included the results in the path simulations. Made some changes to the path simulator document so I'd appreciate it if you'd discard the old one (see below).
 
I'll add JT65 and WSPR results to the list as soon as I get them.  
 

Tony, K2MO
 
 
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                   September 8, 2008
 

Digital Mode HF Path Simulations

 

Complied by Anthony Bombardiere, K2MO

dxdx@...

 

 

Path Simulator by Moe Wheatley, AE4JY

 

Digital mode Software

Fldigi

Jason

MixW

MMVari

Multipsk

WSJT

 

 

_________________________________________________

 

 

Baseline Sensitivity Test

Minimum SNR

(Directg path - no Ionospheric distortion)

In this test, the minimum SNR is reached when all the data passing through the simulator decodes without error. A direct path was used to establish the baseline SNR for each mode. The "Quick Brown Fox" Pangram was used for each test.

Jason Turbo (Fast)...............-25db
PSKAM10..........................-20db

PSK10............................-18db
Contestia 500/32.................-15db
DominoEX-4 ......................-15db
FEC-31...........................-15db
THROBX-4.........................-15db
MFSK16...........................-14db
THOR11...........................-14db
RTTYM*...........................-13db
Contestia 500/16.................-13db
CW 20 WPM**.......................13db
THOR16...........................-12db
Olivia 500/16 ...................-12db
MFSK31*..........................-12db
Olivia 500/8.....................-10db
PSK31........................... -10db

CHIP-64............................8db
DominoEX-11.......................-8db
MT63 1K...........................-8db
Olivia 500/4..................... -8db
PSK63.............................-7db
Feld Hell.........................-7db

CHIP-128..........................-5db
RTTY 45...........................-5db
PAX2..............................-2db
HFPacket (300baud)................+1db


* Intermittent "bug" with RTTYM MixW Software

** Subjective speed dictates SNR
______________________________________________

 

Ionospheric Simulations

 

Propagation simulators are often used to test the performance of HF communication systems. Although they cannot duplicate the infinite number of complex variations that take place in the real ionosphere, they can mimic the fundamental characteristics of HF path distortion.

Estimating the performance of digital modes on the air can be challenging. The ionosphere is always in flux and conditions can change from one minute to the next. Ionospheric simulator parameters remain constant which makes for a more level playing field when comparing modes.

The effects of multipath and Doppler spread are always present to some degree; even on quiet days. Modes that are less robust will start to show a decrease in throughput as the magnitude of distortion increases.

The path simulations below should help when choosing an alternative mode that's more likely to survive when conditions start to deteriorate. The ionospheric simulations represent moderate to severe conditons for each latitude.

Tony, K2MO

 

 

Simulation: High Latitude

Magnitude: Moderate

Path Delay: 3ms

Frequency Spread: 10Hz

SNR: -8db (weak signal)

Contestia 500/16.................100%
CW 20 WPM........................100%
MFSK16...........................100%
MFSK31**.........................100%
Olivia 500/16....................100%
Olivia 500/8.....................100%
RTTYM 500/32.....................100%
Olivia 500/4......................90%
Feld Hell*........................90%
ThrobX-4..........................70%

Chip-64.......................No Copy

Chip-128......................No Copy

DominoEX 4bd..................No Copy
DominoEX 11bd.................No Copy
FEC-31........................No Copy
PSK31.........................No Copy
Jason Turbo (fast)............No Copy
PSK10.........................No Copy
PSKAM10.......................No Copy
PSK63.........................No Copy
RTTY45........................No Copy
THOR-11.......................No Copy
THOR-16.......................No Copy
MT63..........................No Copy

SNR: +10db (Moderate Signal)

Chip64..........................90%

Chip-128**......................00

Feld Hell*......................90%

Olivia 500/4....................90%

RTTY45..........................90%
ThrobX-4........................70%

DominoEX 4bd................No Copy
DominoEX 11bd...............No Copy
FEC-31......................No Copy
PSK31.......................No Copy
Jason Turbo(fast)...........No Copy
PSK10.......................No Copy
PSKAM10.....................No Copy
PSK63.......................No Copy
THOR-11.....................No Copy
THOR-16.....................No Copy
MT63........................No Copy

*diffuse text - readable
**Intermittent decode problem with Chip-128


_______________________________________________________

 

 

Simulation: High Latitude

Magnitude: Disturbed

Path Delay: 7ms

Frequency Spread: 30Hz

SNR: -3db (weak signal)

Contestia 500/16.................100%
CW 20 WPM........................100%
Olivia 500/16....................100%
Olivia 500/8.....................100%
Olivia 500/4......................95%
RTTYM**...........................95%
MFSK31........................... 90%
MFSK16............................75%
RTTY..............................40%

Chip-64...........................10%

Chip-128**....................no copy
DominoEX-4....................no copy
FEC-31........................no copy
Jason Turbo (Fa...............no copy
MT631K........................no copy
PSK10.........................no copy
PSKAM10.......................no copy
PSK31.........................no copy
PSK63.........................no copy
Thor-11.......................no copy
ThrobX-4......................no copy
Feld Hell....................Readable

SNR: +10db (Moderate Signal)

Olivia 500/4......................100%

Feld Hell*.........................90%

Chip64.............................75%

Chip-128**.........................75%

RTTY45.............................50%
ThrobX-4.......................No Copy

DominoEX 4bd...................No Copy
DominoEX 11bd..................No Copy
FEC-31.........................No Copy
PSK31..........................No Copy
Jason Turbo (fast..............No Copy
PSK10..........................No Copy
PSKAM10........................No Copy
PSK63..........................No Copy
THOR-11........................No Copy
THOR-16........................No Copy
MT63...........................No Copy

* diffuse print - readable
** Intermittent decode problem Chip-128
________________________________________________________

 

Simulation: Mid-Latitude

Magnitude: Disturbed

Path Delay: 2ms

Frequency Spread: 1Hz

SNR: -8db SNR (weak signal)

Contestia 500/16.................100%
MFSK16...........................100%
Olivia 500/16....................100%

Thor-11..........................100%

Thor-16..........................100%
CW 20 WPM.........................90%*
DominoEX 4bd......................90%
Feld Hell.........................90%
MFSK31 ...........................90%
MT63 1K...........................90%
Olivia 500/8......................90%
Olivia 500/4......................90%
RTTYM 500/32......................90%
ThrobX-4..........................90%
DominoEX 11bd.....................80%
FEC-31............................70%
PSK31.............................70%
PSK63.............................50%
PSKAM10...........................50%
Jason Turbo (Fast)................35%
RTTY45............................20%
PSK10.............................20%

Chip-64...........................20%

Chip-128**.........................00

SNR: +10db (Moderate Signal)

DominoEX 11bd.....................100%

Feld Hell*........................100%

FEC-31............................100%

MT63..............................100%

Olivia 500/4......................100%

THOR-11...........................100%

THOR-16...........................100%

ThrobX-4..........................100%

SK63...............................95%

Chip64.............................90%

PSK31..............................90%

PSKAM10............................90%

RTTY45.............................90%

DominoEX 4bd.......................90%

Chip-128**..........................00

Jason Turbo (fast).............No Copy

PSK10..........................No Copy

* diffuse print - readable
** Intermittent decode problem Chip-128

______________________________________________________________

 

Simulation: Low-Latitude

Magnitude: High

Path Delay: 6ms

Frequency Spread: 10Hz

SNR: -8db SNR (weak signal)

Contestia 500/16................100%
MFSK16..........................100%
MFSK31..........................100%
Olivia 500/16...................100%
RTTYM 500/32....................100%
CW 20 WPM........................90%
Olivia 500/8.....................90%
Olivia 500/4.....................90%
Throbx-4.........................70%
Feld Hell.................Poor Copy*

Chip-64......................No Copy

Chip-128.....................No Copy
DominoEX 4bd ................No Copy
DominoEX 11bd................No Copy
FEC-31.......................No Copy
Jason Turbo (Fast)...........No Copy
MT63 1k......................No Copy
PSK10........................No Copy
PSKAM10......................No Copy
PSK31........................No Copy
PSK63........................No Copy
RTTY45.......................No Copy
Thor-11bd....................No Copy
Thor-16bd....................No Copy

SNR: +10db (Moderate Signal)

Olivia 500/4.....................100%

Feld Hell........................90%*

Chip64............................90%

Chip-128.........................??**

RTTY45............................70%
ThrobX-4......................No Copy

DominoEX 4bd..................No Copy
DominoEX 11bd.................No Copy
FEC-31........................No Copy
PSK31.........................No Copy
Jason Turbo (fast)............No Copy
PSK10.........................No Copy
PSKAM10.......................No Copy
PSK63.........................No Copy
THOR-11.......................No Copy
THOR-16.......................No Copy
MT63..........................No Copy

* Characters diffuse difficult to read.

** Intermittent decode problem Chip-128


__________________________________________________________

N.V.I.S.

Near Virtical Incidence Skywave

Simulation: Mid-Latitude NVIS

Magnitude: High

Path Delay: 20ms*

Frequency Spread: 1Hz

 

*NVIS waves penetrate deeper into the ionosphere

than waves that are beamed at low angles. The

increased interaction with the plasma tends to

slow the wave down increasing the time-of-flight.

NVIS sky wave echoes can take up to 20ms to return

and can often mix with ground waves due to the close

proximity of NVIS stations.

Multi-path timing delays of this magnitude can

cause internal timing issues for some digital

modes.

The 20ms path delay used in this simulation is most

likely the worst case scenario.

SNR: +10db

Contestia 500/32.................100%

CW 20 WPM........................100%

MFSK16...........................100%

MFSK31 (MMvari)..................100%

MT63 1K..........................100%

Olivia 500/16....................100%

RTTYM 500/32.....................100%

THOR11...........................100%

THOR16...........................100%

Contestia 500/16..................95%

Olivia 500/4..................... 95%

DominoEX-4 .......................95%

DominoEX-11.......................85%

Feld Hell*....................... 80%

RTTY 45...........................80%

Chip-64...........................75%

DominoEX-22.......................60%

THROBX-4..........................60%

PSK31.............................10%

PSK63.............................10%

FEC-31............................nil
PSKAM10...........................nil

PSK10.............................nil

ARQ Modes (Unproto)

ALE400............................10%

Pax...............................nil

Pax-2.............................nil

HFPacket (300baud)................nil

HFPacket (300baud)................nil

* Hellschreiber Text Ghosting - difficult to read print

 

 

 

 

__________________________________________________________

 

 

ARQ Modes

Minimum SNR Test

(Direct Path no Ionospheric distortion)

PAX (UNPROTO)...................-11db

ALE400 (UNPROTO).................-8db

PAX2 (Unproto)...................-7db

HF Packet (300 baud Unproto).....+1db

 

_______________________________________________

 

 

Simulation: High-Latitude

PathSim Title: Moderate

Magnitude: Moderate

Criteria: Complete Pangram Decode

(*)Indicates partial decode

Partial Decode Criteria: => 50% decode

 

ALE400 (Unproto).............-1db / -6db*

PAX (Unproto)................-4db / -10db*

PAX2 (Unproto)...............+2db / 0db*

HF Packet (Unproto 300bd)......NO DECODE

*Partial Decode

___________________________________________________

 

Simulation: High-Latitude

PathSim Title: Disturbed

Magnitude: High

Criteria: Complete Pangram Decode

(*)Indicates partial decode

Partial Decode Criteria: =>50% Copy

 

ALE400 (Unproto)...............Incomplete / +2db*

PAX (Unproto)..................NO DECODE

PAX2 (Unproto).................NO DECODE

HF Packet (Unproto 300bd)......NO DECODE

 

___________________________________________________

 

Simulation: Mid-Latitude

PathSim Title: Disturbed

Magnitude: Low

Criteria: Complete Pangram Decode

(*)Indicates partial decode

Partial Decode Criteria: => 50% Copy

ALE400 (Unproto)...............-2db / -6db*

PAX (Unproto)..................-4db / -10db*

PAX2 (Unproto).................+1db / -2db*

HF Packet (Unproto 300bd).........NO DECODE

 

_____________________________________________________

Simulation: Low-Latitude

PathSim Title: Disturbed

Magnitude: High

Criteria: Complete Pangram Decode

(*)Indicates partial decode

Partial Decode Criteria: =>50% Copy

 

ALE400 (Unproto)................0db / -5db*

PAX (Unproto)...................0db / -6db*

PAX2 (Unproto)....................NO DECODE

HF Packet (Unproto 300bd).........NO DECODE

 

 

 

 

 

_________________________________________________________________

 

RSID and Video I.D.Tests

(MutliPSK Software by F6CTE)

 

Minimum SNR (no Ionospheric distortion)

RSID......... -25db

Video ID..... -2db

High-Latitude Moderate

RSID............No Decode

Video......Partial Decode*

* Difuse text difficult to read regardless of SNR

 

 

High-Latitude Disturbed

RSID........No Decode

Video.......No Decode*

*Text completely difuse

 

 

 

Mid-Latitude Disturbed

RSID........-25db

Video....... +3db

 

 

Low-Latitude Disturbed

RSID........No Decode

Video.......Partial Decode*

* Difuse text difficult to read regardless of SNR

 

 

__________________________________________________________

WSJT Modes

 

Minimum SNR

(direct path - no ionospheric distortion)

In this test, the minimum SNR is reached when all WSJT messages are extracted from each sequence. A direct path was used to establish the baseline SNR.

 

JT65A*...........-30db**

JT6M.............-12db

FSK441............-3db

WSPR*............-30db**

 

*Difficult to evaluate - mode timing issues. 

**Estimated minimum SNR 

 

Ionospheric Simulations

 

The FSK441 mode is intended for high speed VHF/UHF meteor scatter. It is NOT suitable for HF. JT6M was specifically designed for meteor and ion-scatter on the 6 meter band.

The following tests show the robust characteristics of JT6M. Throughput was determined by the percentage of error-free text decoded in all 5 WSJT messages.   

 

 

High-latitude Moderate

(-8db SNR)

JT6M.............100%

 

High-latitude Disturbed

(-3db SNR)

JT6M..............75%

Mid-latitude Disturbed

(-8db SNR)

JT6M.............100%

Low-latitude Disturbed

(-8db SNR)

JT6M.............100%

 

 

 

 

 

 

 

 

 

 

 

 
 
 


High speed packet

Ross <rbiggar@...>
 

I am looking for a packet program, which I can use to operate my Symek TNC3S at 57600
but which has the kiss mode.
Any one any ideas.
 
Packet was in favour a few years ago and all the programs I can find are very old,  dont like the kiss mode,
or cant talk to the TNC3S at 57600.
 
Regards to all
Ross
ZL1WN
.
 
 


Re: fldigi qrz.com look up

Stelios Bounanos <digradio@...>
 

Hi Graham,

On Mon, 08 Sep 2008 18:31:48 -0000, "Graham" <g0nbd@hotmail.com> said:
Thanks for the link, Stelios, I'n not quite sure of the final
situation, I know i can access via digipan or dm780, however are 'you'
using a differant service from qrz ?, as nither of the other packages
need a user name or pass word ?
is there a problem over access rights ?
Before version 2.0, fldigi was able to look up callsigns by "screen
scraping" the QRZ html pages (which is _possibly_ what digipan and dm780
do now -- I really don't know).

Later, QRZ changed its web page format and its owner also made it clear
that he neither approved of screen scrapers, nor would he make any
particular effort to accommodate them. At the time, we were planning to
use XML for an unrelated purpose and so, rather than try to play
catch-up, we wrote a client for QRZ's XML access interface.

The XML insterface is a bit faster and has so far worked without fault.
It does require a user account and paid subscription as described here:

http://online.qrz.com/


73,
Stelios, M0GLD.