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Re: VARA-FM Highly Variable Throughput


 

Yes, that looks correct.

> North was using a 8900R with "Rig Blaster Plug and Play" and switched to an FT897D with similar results, using a J-Pole at 10' and later putting it at 25'
> West was using a DRA-100 interface with an Icom 880H. I asked but did not personally verify that he had the radio set to use the 9600 mode. His antenna is a comet GP6 at 50'
> South initially used an FTM400DXR and Digirig with which we were successful, but switched to an FT991 (not "A") later. That, I believe accounts for the South -> North problem as he was using the USB interface in wide mode. It seems reasonable that the acknowledgements, being FSK, would get through OK but the data would not , so north could send but south couldn't. The antenna was repointed when switching the destination between west and north. In retrospect it may have been a little bit off but a 3-el has quite a wide pattern.

We will test again on Wednesday with just the FTM400DXR at south. I have an 880H and a DRA100 (which I've only used so far with an IC-7100) as well and will try to configure it by then to make sure we have the settings correct.

If the issue was with the FT991 then we are still looking for why neither south nor north could receive files from West, but the symptoms seem so similar that it may also be a bandwidth problem at the sending end.

73,
Chris VE3NRT

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