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

John Brier johnbrier at gmail.com
Sun Nov 19 19:16:21 UTC 2017

Oh interesting. I didn't consider that. I will see if I can hook the
radio into my laptop directly, or try another recorder, though my
other recorder does 44.1 KHz only, not 48 KHz like the manual says is

Thanks Paul.

73, John Brier KG4AKV

On Sun, Nov 19, 2017 at 2:11 PM, Paul Stoetzer <n8hm at arrl.net> wrote:
> 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
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