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@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:
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_-_FM...
Ideas?
73, John Brier KG4AKV _______________________________________________ Sent via AMSAT-BB@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