Finally got a chance to tonight to see if I could get some signals in from PSAT2. Got a very nice image on a 58 degree pass (https://pbs.twimg.com/media/D-ZE3vHU4AE0Ah5.png), but I noticed it was intertwined with a PSK signal. Is that supposed to be?
Got a stand-alone PSK signal a while later, but FLdigi couldn't decode it, because it looked like two separate PSK signal? How can you decode it then? (And yes, if the answer is out there accept my apologies: I have not been paying attention this past week. Sorry).
73 de Hans
BX2ABT
Yes, PSK31 and SSTV are in the same audio.. Did you capture a picture of the waterfall so we can see how the two look? PSK31 users should avoid the center of the passband where the SSTV tones are 1200 to 2300.
Also, we would be happy to see a good image of a waterfall with multiple PSK31 traces in it. So far, I don't think anyone has claimed to have made the first PSK31 contact via PSAT2.
Since the 10m PSK31 uplink will shift a total of about 1 KHz during the pass. Users should probably always begin at the 29.481x frequency that will have them at about 1 KHz in the downlink passband. They will then shift down during the pass.
But ideally, people will uplink with the special PSK31 full-duplex Transmit program written by andy Flowers that will auto-adjust your uplink to maintain a constant tone in the downlink. Then you can select any initial TX tone that shows your signal between 400 Hz and 1 kHz. And you will ermain their throughout the pass.
This is just a first stab at a procedure. It is subject to change as we see more users.
Bob, WB4APR -----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Hans BX2ABT via AMSAT-BB Sent: Monday, July 1, 2019 10:21 AM To: AMSAT amsat-bb@amsat.org Subject: [amsat-bb] PSAT2 SSTV & PSK mixed
Finally got a chance to tonight to see if I could get some signals in from PSAT2. Got a very nice image on a 58 degree pass (https://pbs.twimg.com/media/D-ZE3vHU4AE0Ah5.png), but I noticed it was intertwined with a PSK signal. Is that supposed to be?
Got a stand-alone PSK signal a while later, but FLdigi couldn't decode it, because it looked like two separate PSK signal? How can you decode it then? (And yes, if the answer is out there accept my apologies: I have not been paying attention this past week. Sorry).
73 de Hans
BX2ABT
_______________________________________________ Sent via AMSAT-BB@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: https://www.amsat.org/mailman/listinfo/amsat-bb
Thanks, Bob - very helpful info as always.
Hans, FLDigi is able to decode multiple PSK31 downlink streams at the same time. Please see the first picture in my tweet from last night:
https://twitter.com/scott23192/status/1145531115974922240
... for an example of my quick PSK31 decode from PSAT-2 even though it's still at very low elevation for me here.
-Scott, K4KDR
=========================
On Mon, Jul 1, 2019 at 10:50 AM Robert Bruninga via AMSAT-BB < amsat-bb@amsat.org> wrote:
Yes, PSK31 and SSTV are in the same audio.. Did you capture a picture of the waterfall so we can see how the two look? PSK31 users should avoid the center of the passband where the SSTV tones are 1200 to 2300.
Also, we would be happy to see a good image of a waterfall with multiple PSK31 traces in it. So far, I don't think anyone has claimed to have made the first PSK31 contact via PSAT2.
Since the 10m PSK31 uplink will shift a total of about 1 KHz during the pass. Users should probably always begin at the 29.481x frequency that will have them at about 1 KHz in the downlink passband. They will then shift down during the pass.
But ideally, people will uplink with the special PSK31 full-duplex Transmit program written by andy Flowers that will auto-adjust your uplink to maintain a constant tone in the downlink. Then you can select any initial TX tone that shows your signal between 400 Hz and 1 kHz. And you will ermain their throughout the pass.
This is just a first stab at a procedure. It is subject to change as we see more users.
Bob, WB4APR -----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Hans BX2ABT via AMSAT-BB Sent: Monday, July 1, 2019 10:21 AM To: AMSAT amsat-bb@amsat.org Subject: [amsat-bb] PSAT2 SSTV & PSK mixed
Finally got a chance to tonight to see if I could get some signals in from PSAT2. Got a very nice image on a 58 degree pass (https://pbs.twimg.com/media/D-ZE3vHU4AE0Ah5.png), but I noticed it was intertwined with a PSK signal. Is that supposed to be?
Got a stand-alone PSK signal a while later, but FLdigi couldn't decode it, because it looked like two separate PSK signal? How can you decode it then? (And yes, if the answer is out there accept my apologies: I have not been paying attention this past week. Sorry).
73 de Hans
BX2ABT
Hello Bob,
I've taken a picture of the waterfall from the raw IQ file so the frequency is not correct, but here it is: http://bx2abt.com/main/data/_uploaded/image/20190701-1257_435360-PSAT2.png
The PSK31 signal is around 380 Hz, but still can't decode it. Anybody who wants to try: here is the audio file. http://bx2abt.com/main/data/_uploaded/media/20190701-1257_435360-PSAT2.mp3
I don't have a digital setup for HF, so can't do PSK31. It also means a dual setup for audio/PTT on one PC. I doubt if I have enough USB ports for that, hi hi.
Later....
Hans
BX2ABT
On 07/01/2019 10:49 PM, Robert Bruninga wrote:
Yes, PSK31 and SSTV are in the same audio.. Did you capture a picture of the waterfall so we can see how the two look? PSK31 users should avoid the center of the passband where the SSTV tones are 1200 to 2300.
Also, we would be happy to see a good image of a waterfall with multiple PSK31 traces in it. So far, I don't think anyone has claimed to have made the first PSK31 contact via PSAT2.
Since the 10m PSK31 uplink will shift a total of about 1 KHz during the pass. Users should probably always begin at the 29.481x frequency that will have them at about 1 KHz in the downlink passband. They will then shift down during the pass.
But ideally, people will uplink with the special PSK31 full-duplex Transmit program written by andy Flowers that will auto-adjust your uplink to maintain a constant tone in the downlink. Then you can select any initial TX tone that shows your signal between 400 Hz and 1 kHz. And you will ermain their throughout the pass.
This is just a first stab at a procedure. It is subject to change as we see more users.
Bob, WB4APR -----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Hans BX2ABT via AMSAT-BB Sent: Monday, July 1, 2019 10:21 AM To: AMSAT amsat-bb@amsat.org Subject: [amsat-bb] PSAT2 SSTV & PSK mixed
Finally got a chance to tonight to see if I could get some signals in from PSAT2. Got a very nice image on a 58 degree pass (https://pbs.twimg.com/media/D-ZE3vHU4AE0Ah5.png), but I noticed it was intertwined with a PSK signal. Is that supposed to be?
Got a stand-alone PSK signal a while later, but FLdigi couldn't decode it, because it looked like two separate PSK signal? How can you decode it then? (And yes, if the answer is out there accept my apologies: I have not been paying attention this past week. Sorry).
73 de Hans
BX2ABT
Sent via AMSAT-BB@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: https://www.amsat.org/mailman/listinfo/amsat-bb
participants (3)
-
Hans BX2ABT -
Robert Bruninga -
Scott