New VARA HF v4.4.3 released: #VARA


Graham
 

QSP from  VARA site, news of  new  features and  functions .
Some  insight  to the  USAF  adoption ,  round  compression rates 
and BBS  connect  times , 

73-Graham 

Jose EA5HVK

10 Apr 2021, 16:20:45
to VARA HF Modem
good afternoon,
 
New VARA HF v4.4.3 released:
 
The previous release versions of VARA uses a 16-bit hash to resolve the callsign and this has a small but finite chance of getting the call wrong (One in 6553 error rate). John Wiseman detected and reported a case he observed this happening. 
Now this is changed to a 32-bit representation which will essentially eliminate the chance of this happening. 
 
VARA Compression added, which reduces  connect overhead's for weak signal conditions.  Averaged simulation runs showed improvements of a factor of 2 in the Speed Level 1. The improvement becomes more modest as the SNR is improved until Speed Level 6, where compression is not necessary. Messages which already have Winlink applied B2F compression are not compressed.
 
Compression also accelerates dramatically the BBS throughput (using VARA Terminal v1.1.5). 
Thus, BBS Lists are accelerated by 3.0, Forecast messages by 2.6 and MARS Encrypted Data by 1.5. For more info about how use VARA Terminal for BBS MARS connections, contact with Dave AF2HV (Squadron Commander, 22nd AFMARS Trans-Global Communications Digital Operations Military Auxiliary Radio System, USAF)
 
This great feature is active only for the registered users and was added a few days ago to VARA SAT v4.1.0. and , will  be  embodied  in VARA FM soon. 
 
 
 
73's Jose
EA5HVK


Graham
 
Edited

File transfer issues with  V-Chat  version 1-2-4  resolved 

VARA Chat v1.2.5

Data   limit is  now  2MB  per  file  

73-Graham
g0nbd