[amsat-bb] PSAT PSK31 experimental software

[David W0DHB]

I'm using a GAP Challenger vertical for 10m and on 70cm an M2 30el (15h/15V)
RHCP yagi on a Yaesu G5500 az/el rotator, but a handheld Arrow or similar
antenna for 70cm would probably work fine.

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Joe
Sent: Thursday, July 16, 2015 6:03 PM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] PSAT PSK31 experimental software

Thats what I was most interested in the antennas. describe them...

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 7/16/2015 5:43 PM, David W0DHB wrote:
> 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
> *
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> 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%20trans
>> p
>> 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. 
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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. 
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official views of AMSAT-NA.
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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