[amsat-bb] PSAT PSK31 experimental software

[David W0DHB]

Thanks Joe I forgot BB would wrap line.
This one works also
https://www.dropbox.com/s/r6ywkczcf95o3f2/NO84.wav?dl=0 

Base equipment is
10m SSB Transmitter with the ability for TX audio being fed by Computer
sound card.
70cm FM RX / antenna system capable of copying satellite downlink and able
to feed RX audio to Computer.
Computer with Windows/Mac , DopplerSQF software and software that will demod
PSK31 (Fldigi,Digipan DM780 to name a few)

Software to do downlink doppler tuning is very useful,  but not required.

Dave W0DHB

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Joe
Sent: Thursday, July 16, 2015 4:24 PM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] PSAT PSK31 experimental software

hEDRE i FIXED THAT url ALSO,

*http://tinyurl.com/q3np2sm

Joe
*
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On 7/16/2015 2:57 PM, David W0DHB wrote:
> Andy
>
> Here is a recording of the 1930 pass of NO-84
> https://www.dropbox.com/s/2qtb5d2cm3ktrr0/FM%20435.359944MHz%20%5B12k%
> 5D%207
> -16-2015%2019%2033%2052.wav?dl=0
>
> Bob KO6TZ and I had a successful QSO. My audio was set at 1500 Uplink 
> frequency  of 28.119700 MHz .
>
> The signals seemed to be stable, decoding at my end (DM780 ) was not 
> stellar, I'm running the recording through fldigi, MixW and Digipan to 
> see if it's any better.
>
> Dave W0DHB
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of David 
> W0DHB
> Sent: Thursday, July 16, 2015 8:41 AM
> To: 'aflowers at frontiernet.net'; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] PSAT PSK31 experimental software
>
> Hey Andy
>
> The ability to select soundcard would be helpful. In my setup TX audio 
> is fed by a virtual audio cable set to match the 48K sample rate that 
> DopplerPSK is using.
> Folks using windows should set the recording device side of their 
> soundcard to a 48K sample rate (it usually defaults to 44.1K).
>
> You are correct that the uplink frequency is high, I apply a -300 Hz 
> calibration offset.
>
> Thanks for all your work on this.
>
> Dave W0DHB
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of 
> aflowers at frontiernet.net
> Sent: Thursday, July 16, 2015 6:29 AM
> To: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] PSAT PSK31 experimental software
>
> Bob, Dave;
> That's great.  I'm interested in how well it tracks when the satellite 
> is at a very high elevation and the Doppler is >3 Hz/s.  I suspect the 
> error is going to be mostly in the estimates of the orbital elements, but
we'll see.
> I will try to join you on the pass when I can cobble together an 
> uplink and a downlink in the same place--probably next week sometime 
> after I get back from vacation.
>
> I think you should be able to share a sound device on most OS's, but I 
> have not tried.  I assumed it would work on modern Windows OS's 
> because of the hardware abstraction.  The program appears to run fine 
> on OSX, but I have not tried running CocoaModem or some other software 
> next to it.  Ultimately I could also add a demodulator to the program 
> itself, but that will take some work....I know several hams have 
> separate sound cards for radio stuff, so I may need to add a device 
> selection option in case the system default (or whatever Java picks as the
default) isn't what you want.
>
> The audio frequency displayed in DopplerPSK is the audio frequency 
> being send to the radio, not what you should expect in the passband of 
> your downlink receiver. The LO on PSAT is apparently a bit below 28120 
> KHz, so if your radio was tuned to 28120 USB (suppressed carrier 
> frequency) you would expect to be a bit higher than 2000Hz in the FM
passband:
>
> http://www.urel.feec.vutbr.cz/esl/files/Projects/PSAT/P%20sat%20transp
> onder%
> 20WEB%20spec02.htm
>
> In general, if you want to be lower in the passband I would lower your 
> transmitter RF frequency rather than the audio frequency going to the 
> transmitter.  The reason being that if you have any non-linearity in 
> the audio chain you don't end up transmitting a harmonic higher in the 
> band that might bother someone else.  Of course, you can probably see 
> if this is an issue or not since the satellite also serves as a crude 
> signal analyzer :-) I chose 2000 Hz as a center since at maximum 
> Doppler of around 700 Hz, the
> ~2700 Hz tone should go through the transmitter's IF filter without 
> too much attenuation while keeping all the third harmonics and most of 
> the time the second harmonic above the cutoff of a 3 KHz IF filter.  
> Every radio is a bit different, however.  You may find that the 1500Hz 
> sweep in the program shows you all your passband ripple in your IF 
> filter :-)
>
> Since it works, I'm more motivated to improve the ergonomics of the 
> interface.  Much of that depends on the unique operating practices of 
> satellite operation.
>
> Andy K0SM/2
>
>
>
>
>   On Thursday, July 16, 2015 12:31 AM, KO6TZ Bob 
> <my.callsign at verizon.net>
> wrote:
>   
>
> The software worked great !!!  Produced a straight line on the 
> waterfall for the down link.
>
> As expected, I was alone on the pass, so no opportunity for a contact.
>
> I was using digi-pan for the RX, my signal was at around 2200Hz..
> Probably an indication the oscillator in my radio is off a bit.  I 
> think I will lower the frequency from 2000 to about 1600.  That will 
> put my signal lower in the VF pass band.
>
> I like the program.  Had good copy.
>
> THANKS.....
>
>
> BOB  KO6TZ
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> to all interested persons worldwide without requiring membership. 
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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