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

[Mark L. Hammond]

Great discovery, Hasan.  Nice work.  That is much better copy than I would expect from that antenna system.  

73,

Mark N8MH 

At 11:11 AM 10/5/2018 -0500, Hasan al-Basri wrote:
>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
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