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

[Paul Stoetzer]

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

73,

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
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb