[amsat-bb] Foxtelem and Kenwood TM-V71 signal to noise ratio

Paul Stoetzer n8hm at arrl.net
Sun Nov 19 19:11:11 UTC 2017

Seems likely that some sort of audio filtering is going on in your recorder.


Paul, N8HM

On Sun, Nov 19, 2017 at 2:07 PM, John Brier <johnbrier at gmail.com> wrote:
> I made a cable to tap the 9600 data pin off my Kenwood and I'm trying
> to decode telemetry from AO-91.
> I am having trouble getting a continuously clean reception, so I don't
> expect frames, which I'm not getting, but parts of the reception are
> fine and yet FoxTelem still shows a low S/R of 1.2, 1.5 at best. I am
> wondering if there is still some filtering going on. I notice the
> peaks of the "bits" are not flat like they are supposed to be
> according to the manual:
> https://imgur.com/pfX7cSK
> I am recording the audio off the radio into a Zoom H1 at 48,000 KHz 16bit wav.
> Maybe I should try hooking the radio directly up to a computer into FoxTelem.
> Here is my recording:
> https://www.dropbox.com/s/ineqhoprz50ljl3/2017-11-19_-_1743_UTC_-_AO-91_-_FM05_-_KG4AKV_just_transmissions.wav?dl=0
> Ideas?
> 73, John Brier KG4AKV
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