Re: ROS MF-7 IS OUT THERE ! (And less than 100 Hz wide)


1 Hour data qso 2330>0030 gmt , G0NBD ~ CO2DC , dial set 7055 usb using ROS .. MF-7 the new 100 (98) Hz live qso mode.

No longer can you blame qsb for getting the spelling wrong , this was a crazy qso with 99% to 100% decode at each end due to qsb , one lost sync frame (by me) . and the full char set £$%^ etc !

The catch ? web-sdr ? big power ? no , just looks like the system works , my power 20 watts carrier , CO2DC , just 1 watt later reducing to 250 mW ... (slight jingle in the noise)and 1 error ! = B . captured tx from CO2DC :-

RX7: 23:51 @ 3.3 Hz: G0N!D de CO2DC ok now I am with only 1/4 w i asumme that the mistakes will incrase dramaticaly let me now if this even syncro bk <STOP> -21 dB

Not bad for a ft897-d , and a 35 feet of 2 inch scafold pole home made end fed vertical (pre-amp -off noise showing 5 on the s-meter)

G ,,

--- In, Andy obrien <k3ukandy@...> wrote:

good news, nice to see this mode make good progress.

Andy K3UK

On Sat, May 15, 2010 at 9:53 AM, graham787 <g0nbd@...> wrote:

After a series of successful test transmissions, the latest version of
ROS-3-6-1 (at the moment) now has the MF mode included , this allows live
key board qso's at a data rate close to 500/8 and also has a baud-1 mode
with enhanced s/n performance , transmission via non-linear systems is
possible , though the logic drive of class e/d will still present problems.

To comply with the EU 100 Hz data bandwidth of the 500Khz permits the mode
is coded to occupy less than 100 Hz , the first custom mode to be produced
to enable data communications with in the EU on MF

The first on air qso over 200 miles is listed >\;

Scroll down the page ... and you will see the RX station F4DTL was in Paris
650 Km from myself running 20 watts to 35 ft top loaded vertical and round
325 km from Jim running 100 w to a similar array

Its quite possible that the 100 Hz mode will function well over HF over the
polar paths where psk tends to fail ?

G ..

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