[amsat-bb] PSAT PSK31 experimental software (BRICsat too)

Fri Jul 17 15:46:14 UTC 2015

I saw someone's PSK transmission when psat came over, it was obvious 
they were using the software because the transmission was nice and 
steady/straight.   too rough to decode at the time.  I'll try again.

When Bricsat followed a few minutes later I didn't hear/see anything at 
all.  Not even APRS.   Is bricsat lower power?

73
Lee
W5LMM

On 7/16/2015 6:31 PM, Robert Bruninga wrote:
> Remember to TEST your 10m PSK31 uplink about 10 minutes early and you may
> bring up BRICSAT PSK31.  I may have just heard it about 6 minutes before
> PSAT.  Same uplink and same downlink as PSAT.
>
> Bob, WB4aPR
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of David
> W0DHB
> Sent: Thursday, July 16, 2015 8:27 PM
> To: 'Joe'; amsat-bb at amsat.org
> Subject: Re: [amsat-bb] PSAT PSK31 experimental software
>
> 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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>> official views of AMSAT-NA.
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>> _______________________________________________
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> program!
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>>
>> _______________________________________________
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>> to all interested persons worldwide without requiring membership.
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>> the
> official views of AMSAT-NA.
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>>
>>
> _______________________________________________
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> 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!
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>
> _______________________________________________
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> all interested persons worldwide without requiring membership. Opinions
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> to all interested persons worldwide without requiring membership. Opinions expressed
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