[amsat-bb] AO-91/92/85 DUV Decode Sovled

[Hasan al-Basri]

Thanks to all of you and the last magic bullet from Terry, ZL2BAC.

Setup:
2m EggBeater at 7', 80' 9913 coax
AirSpy HF+, SDR-Console V3.03
FoxTelem 1.06r patched
VBAudio from SDRC > Decoder

Checked L/R audio, not an issue for me, as I was getting audio in both
channels. I unchecked Left Audio, to be safe. (FoxTelem)

Symptom: Could not decode DUV telemetry, did not see Eye fully open, always
smeared, and no squared off peaks in the freq display of FoxTelem.

Solution
1. Not only is there a high pass filter in the Narrow FM setting of SDRC
V3, but *there is a second HiPass* in :

Receive > Options > Equalizer  ...in the bottom right hand corner, two
check boxes, Equalizer and 25 Hz filter. They were checked since install, I
had never looked at the Equalizer in all these months of use.

Summary Settings That Work:

SDRC: NFM, 12 kHz
Audio Output Slider 60%
CABLE Input (VB-Audio Virtual Cable)
Narrow FM: Highpas OFF
Receive > Options > Equalizer OFF, HPF OFF

FoxTelem Settings: (Aside from my location/call/etc)

Input Screen:
DUV (not Auto)
Input: CABLE Output (VB-Audio Virtual Cable)
View Filtered Audio
Raised Cosine
Cutoff Freq: 200 Hz
Filter Length: 512

Settings Screen:
All Defaults, except:

FoxTelem Calculates Position
Auto Start Decoder when above horizon

Decoder Options:
Upload to Server
Track Doppler (probably not needed as SDRC is doing this and I'm not using
FunCube)
Store Payloads
Fix Dropped Bits
use Long PRM

Debug Options:
Use Native File Chooser
=================================

My one remaining question:

At the finish of this 15 deg pass, I got 53 Frames, 57 Payloads, and
Queued: 53

When does the queued data get uploaded?  It's been half an hour and nothing
has happened and I'm not showing up as a ground station.

Signals were far from outstanding, so I wouldn't say it is hard to get TLM
copied. 15 deg EL on an Eggbeater only 7' off the ground is not a great
pass.   Lots of fades, lots of noise much of the time.

Thanks to all for help. Now I can make a habit og grabbing TLM.

73 N0AN

Hasan