Argh! The Team at Brno University that built the PSK31 transponder CORRECTS
me.
The uplink is 29.4815 MHz.
Bob
-----Original Message-----
From: Robert Bruninga <bruninga(a)usna.edu>
Sent: Wednesday, June 26, 2019 11:23 AM
To: 'amsat bb' <amsat-bb(a)amsat.org>
Cc: 'Scott' <scott23192(a)gmail.com>
Subject: RE: [amsat-bb] PSAT2 PSK31 Operations Enabled
PSAT2 Ten meter PSK31 uplink and UHF FM 435.350 downlink is ON.
Who will be the first to nail down the ten-meter PSK31 center uplink
frequency?
It should be around 29.40X.
The Total Doppler shift during a pass should be about 1 KHz.
What 29.40X TX uplink gives 1.5 KHz in the UHF passband at the center of the
pass?
Thanks, Ill correct links below. (PSAT has uplink on 28.120. But PSAT2 is
on 29.40X) Bob
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces(a)amsat.org> On Behalf Of Scott via AMSAT-BB
Subject: Re: [amsat-bb] PSAT2 Future Operations
Regarding the PSK31 uplink, please advise the correct RF frequency.
At http://aprs.org/PSAT2/USER-Operations-Manual.doc, the uplink frequency is
listed as 29.401 MHz.
At https://github.com/alpov/PSAT-2/blob/master/README.md, the uplink
frequency is listed as 29.48 MHz.
At http://aprs.org/psat2.html, the uplink frequency is listed as 28.120 MHz
(in text, w/ a graphic indicating "29.XX?").
Thanks!
-Scott, K4KDR
============================
On Wed, Jun 26, 2019 at 10:20 AM Tomáš Urbanec via AMSAT-BB <
amsat-bb(a)amsat.org> wrote:
> Hi Paul,
>
> Thanks for the interest in the PSK31 transponder, as Bob already
> pointed up, the downlink audio spectrum is shared, so at 280Hz and
> 374Hz are
> PSK31 beacon tlm streams from camera board and transponder board
> respectively. Then every 4 minutes the SSTV signal is present so if
> you plan experiments in PSK transponder, try to stay between the
> beacons and SSTV. Description of modes you can find at
> https://github.com/alpov/PSAT-2/blob/master/README.md
>
> We would be glad to answer any questions about this experiments.
>
> We are still awaiting for any positive confirmation of downlink signal
> at 435.350MHz as for us it is still below horizon. Any audio
> recordings, IQ data or at least pictures of reception would be welcomed.
>
> 73! Tomas OK2PNQ and Ales OK2ALP
>
_______________________________________________
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PSAT2 Ten meter PSK31 uplink and UHF FM 435.350 downlink is ON.
Who will be the first to nail down the ten-meter PSK31 center uplink
frequency?
It should be around 29.40X.
The Total Doppler shift during a pass should be about 1 KHz.
What 29.40X TX uplink gives 1.5 KHz in the UHF passband at the center of the
pass?
Thanks, Ill correct links below. (PSAT has uplink on 28.120. But PSAT2 is
on 29.40X)
Bob
-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces(a)amsat.org> On Behalf Of Scott via AMSAT-BB
Subject: Re: [amsat-bb] PSAT2 Future Operations
Regarding the PSK31 uplink, please advise the correct RF frequency.
At http://aprs.org/PSAT2/USER-Operations-Manual.doc, the uplink frequency is
listed as 29.401 MHz.
At https://github.com/alpov/PSAT-2/blob/master/README.md, the uplink
frequency is listed as 29.48 MHz.
At http://aprs.org/psat2.html, the uplink frequency is listed as 28.120 MHz
(in text, w/ a graphic indicating "29.XX?").
Thanks!
-Scott, K4KDR
============================
On Wed, Jun 26, 2019 at 10:20 AM Tomáš Urbanec via AMSAT-BB <
amsat-bb(a)amsat.org> wrote:
> Hi Paul,
>
> Thanks for the interest in the PSK31 transponder, as Bob already
> pointed up, the downlink audio spectrum is shared, so at 280Hz and
> 374Hz are
> PSK31 beacon tlm streams from camera board and transponder board
> respectively. Then every 4 minutes the SSTV signal is present so if
> you plan experiments in PSK transponder, try to stay between the
> beacons and SSTV. Description of modes you can find at
> https://github.com/alpov/PSAT-2/blob/master/README.md
>
> We would be glad to answer any questions about this experiments.
>
> We are still awaiting for any positive confirmation of downlink signal
> at 435.350MHz as for us it is still below horizon. Any audio
> recordings, IQ data or at least pictures of reception would be welcomed.
>
> 73! Tomas OK2PNQ and Ales OK2ALP
>
_______________________________________________
Sent via AMSAT-BB(a)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
PSAT Voltages look good.
The PSK31/SSTV downlink appear to be working well on 435.350+/- Doppler,
But you will only see SSTV during daylight passes (Now occuring in the
Southern Hemisphere) where the Solar charge voltage is above threshold (6.8
volts. THen you should see SSTV images once every 4 minutes automatically
while in the sun.
Northern Hemisphere passes are presently occurring overnight and PSAT2 is
in a 28 degree orbit and not seen at all by high northern latitudes and
most of Europe :-(
PSAT2 APRS digipeating will remain off indefinately while all these other
NEW modes are working. Do not TX any APRS packets on the uplink.
DTMF Grid Uplinks-to-APRS/Voice will be enabled LATER.
While waiting, spend the next day familiarizing yourself with the PSAT2
APRStt touchtone mode. This mode will let you send DTMF Grid square reports
which are translated to VOICE and to an APRS packet on the 145.825
downlink. Be sure to prepare your radio with your pre-programmed DTMF grid
report IN ADVANCE. And learn how to send Touchtone from your radio's DTMF
memory. quickly! It should take under 4 seconds. Do not even think of
sending it manually.
Here is WA7MXZ's translator to calculate your onetime DTMF grid report:
http://aprs.org/aprs_translator.htm
See how it works in about the middle of the PSAT2 page:
http://aprs.org/psat2.html
A successful DTMF uplink will result in a Voice response and an APRS packet
on the downlink for display on APRS radios. Again, no APRS Uplink in this
mode.
This will be painful because of the 4 second uplink transmissions all
colliding on the half-duplex uplink, so PLEASE only attempt your DTMF
uplink once every 30 seconds or longer to give others a chance. And of
course NOT while PSAT2 is downlinking.
We will advise when this mode is enabled.
http://aprs.org/aprstt.html
Bob, WB4APR
There is a lot of great activations happening this Summer. Be sure to keep an eye on AMSAT's Upcoming Satellite Operations webpage for all of the latest announcements.
https://www.amsat.org/satellite-info/upcoming-satellite-operations/
In addition AMSAT's call sign, W3ZM, is popping up all over the U.S. in an effort to operate from all 50 States before this year's 50th Anniversary Symposium. To make this happen, we need your help. Check out https://www.amsat.org/events/was-w3zm/ for more information available.
73,
Robert Bankston, KE4AL
AMSAT-NA VP of User Services
Using your LATEST TLEs for last night: 6/26/19
0443 UTC pass COPIED only ONE BEACON at 5 deg.
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[21:46:54]
T#286,693,062,878,885,162,01000001
0624 UTC pass, copied 5; the first one was at 3 deg.
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:25:23]
T#383,691,061,897,898,162,01000001
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=20 >[23:26:09]
>145.980MHz No Digi.
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:26:24]
T#384,688,097,904,903,162,01000001
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:27:24]
T#385,689,063,908,907,162,01000001
Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=16 >[23:28:48]
>S#000964,0q801
no joy on BRICSAT-2...if its on the same orbit?
73 Christy KB6LTY DM14
---------
xcellent match so far with these elements:
PSAT2
1 44348U 19036K 19176.47956735 .00000352 00000-0 00000+0 0 9991
2 44348 28.5449 199.6259 0392489 107.1682 11.6450 14.96305882 23
Northern Hemisphere passes begin at about 9:35 PM LOCAL time
Then again at around 11:15 PM and then about 01:00 AM local time ish....
What is amazing, is that it looks like it is about the SAME time every day
for a pass even though the orbit is moving earlier
After a few days, there will be a new orbit around 8 PM local time, and
the others above will continue at the same time.
And so forth. So it is moving earlier but appears to have this sun
synchronous behavior...
Bob
Hi Bob,
Congratulations !! on the successful launch of the satellite. I heard strong signals during the 12:30 UTC pass on June 26th over India. Will turn ON the satgate tommorow.
73
Nitin [VU3TYG]
Hi Bob,
Heard PSAT-2 on a 7 degree pass. Unfortunately the highest passes are only
about 7-8 degrees in elevation right now. However managed to snag this at
6/26/2019 at 04:55 and 04:56UTC. I will be listening for BRICSAT-2 next on
437.600 however chances of decoding it will be low due to the low elevation
and the nature of 9600 baud.
1:Fm PSAT2-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [00:54:59R] [+++]
T#294,685,074,921,925,162,01000001
1:Fm PSAT2-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [00:56:00R] [-++]
T#295,684,061,924,927,162,01000001
73 Nick KE8AKW