[amsat-bb] Still trying to decode NO-84 (Doppler)

[Joe]

What is that terrible looking signal on the left?
YIKES!

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 3/3/2017 3:05 PM, Fer via AMSAT-BB wrote:
> Bob
> thanks, now no more doppler even in an overhead pass.
> https://www.dropbox.com/s/45mxdbxv0dj4vys/no-84%203mar17.jpg?dl=0
>
> 73 Fer IW1DTU
>
>      On Thursday, March 2, 2017 3:39 PM, Robert Bruninga <bruninga at usna.edu> wrote:
>   
>
>   One thing to remember is that you cannot use normal Doppler correcting
> software that tunes the radio.  The instantaneous radio steps cause Phase
> discontinuities and that completely destroys PSK31.
>
>
>
> The only ways to work well is to only try to decode when the bird is coming
> right at you or right aways from you and the Doppler is not rapidly
> changing.
>
>
>
> *** OR *** use the special PSK31 Doppler uplink correcting program written
> by Andy Flowers found on the PSAT web page… http://aprs.org/psat.html
>
>
>
> Here is his page:
>
> http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
>
>
>
> This software also allows you to run full duplex so that you can uplink
> continuously throughtout the pass and independently receive all downlinks
> at the same time.  The radio does not tune, but your uplink audio
> compensates for the uplink Doppler so that your trace in the downlink
> appears constant to everyone.
>
>
>
> Yes, you can run UHF Radio stepped Doppler correction that steps down in
> the usual 5 KHz steps 4 times during the pass.  You may still loose an
> instant of phase corrupted characters, but only 4 times, not every few
> seconds as the SSB radio would try to do if the computer program was trying
> to compensate the SSB uplink radio.
>
>
>
> That help?
>
> Bob
>
>
>
> *From:* Fer [mailto:mhz4464 at yahoo.com]
> *Sent:* Thursday, March 02, 2017 10:25 AM
> *To:* Mark Lunday; AMSAT BB; Paul Stoetzer; Robert Bruninga
> *Subject:* Re: [amsat-bb] Still trying to decode NO-84
>
>
>
> I am trying too to activate NO-84, 50w on 28.120 MHz with vertical antenna
> or dipole with FLDIGI (saw no difference, still weak), good downlink signal
> on UHF with SDR-14+SpectraVue as panadapter at 10.7 MHz, beacon decoded in
> FLDIGI,  my weak signal  sometime decoded, strong doppler on my signal
> despite I correct both with orbitron/wispdde using only fresh keps and GPS
> computer sync clock.
>
>
>
> Any idea?
>
> 73 Fer IW1DTU
>
>
>
> here some screenshoot link to dropbox
>
>
>
> https://www.dropbox.com/s/ec2i14l62u4ij3w/NO-84%202%20mar17%20uno.jpg?dl=0
>
>
>
> https://www.dropbox.com/s/l1k3a3h8atyys5l/NO-84%202mar17%20due.jpg?dl=0
>
>
>
>
>
>
>
>
>
> On Thursday, March 2, 2017 2:51 AM, Mark Lunday <wd4elg at outlook.com> wrote:
>
>
>
> 0230 UTC pass, saw the bear claw PSK 31 waveform again.  Anyone else able
> to see the PSK dowllink?  I am seeing 7 parallel traces, almost like the
> transmission is overloading the receiver.
>
> Attempting to attach the file to this email with a capture of what my SDR
> receiver is seeing...
>
> On a positive note, APRS is working perfectly on NO84 even at low passes.
>
> Mark Lunday, WD4ELG
> Greensboro, NC  FM06be
> wd4elg at arrl.net
> http://wd4elg.blogspot.com
> SKCC #16439  FISTS #17972
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>
>     
> _______________________________________________
> 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