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@amsat.org] On Behalf Of David W0DHB Sent: Thursday, July 16, 2015 8:27 PM To: 'Joe'; amsat-bb@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@amsat.org] On Behalf Of Joe Sent: Thursday, July 16, 2015 6:03 PM To: amsat-bb@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@amsat.org] On Behalf Of Joe Sent: Thursday, July 16, 2015 4:24 PM To: amsat-bb@amsat.org Subject: Re: [amsat-bb] PSAT PSK31 experimental software
hEDRE i FIXED THAT url ALSO,
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@amsat.org] On Behalf Of David W0DHB Sent: Thursday, July 16, 2015 8:41 AM To: 'aflowers@frontiernet.net'; amsat-bb@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@amsat.org] On Behalf Of aflowers@frontiernet.net Sent: Thursday, July 16, 2015 6:29 AM To: amsat-bb@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 Bobmy.callsign@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.....
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