PSAT PSK31 435.350 MHz FM downlink is full quieting with 6 bars using a decent UHF Yagi.
But we have not seen any users other than those using the 28.120 PSK channel on HF normally. We welcome people to experiment with it. Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS tracker http://www.byonics.com/mtt4b sent to space. The PSK31 transponder is a single 3.4" square circuit board made by Brno Universtiy in the Czech Republic. The CPU for controlling bulletins and timing is a simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
PSAT has a single 21" VHF and 72" long HF whip. It has two UHF 6" orthogonal monopoles, all of very thin Nitinol wire.
More details will eventually follow as the page will be updated over the coming weeks. http://aprs.org/psat.html
* PSAT packet telemetry is OK, Digipeater will be off (secondary mission) * PSAT PSK31 transponder is ON with 28.120 MHz uplink! (primary mission) * WOD data fixed. Spin data now available. Right now it is at 3 RPM with +Z pointing 45 deg off Sun * Launch TLE elements (below) are still very good * http://PCSAT.APRS.ORG web page is now capturing PSAT telelmetry that users inject into the APRS-IS * BRICSAT telemetry has been heard but is cycling OFF due to low power * BRICSAT PSK31 downlink (also FM) has also been heard barely (when ON) * USS Langley not heard
FREQUENCIES:
PSAT: 145.825 - 1200 baud AX.25 telemetry - digi off PSAT PSK31-5: 435.350 FM down, 28.120 SSB PK31 uplink - Brno University Xponder
BRICsat: 437.975 - 9600 baud telemetry evry 20s BRICsat PSK31-6 - same as PSAT but PSK TLM on 375 Hz (PSAT on 315 Hz)
USS Langley - 437.475 9600 baud telemetry <== CORRECTION
ULTRASat3 <these are still tracking well> 1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009 2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
Bob, WB4APR
I copied a fair amount of telemetry on the PSK downklink just now on the ~1410z pass, which was a low one.
W3ADO-5 beacon B 038 34 29 793 257 +8 e e e W3ADO-5 beacon B 039 53 23 785 260 +12 Oe t{ t W3ADO-5 beacon B 040 34 23 799 257 +7 itostC e o àadi o ee eoO t eD W3ADO-5 beacon B 041 34 23 787 257 +9 tr W3ADO-5 beacon B 042 06 23 782 260 +12 ae W3ADO-5 beacon B 043 71 22 781 259 +14 ro W3ADO-5 beacon B 044 34 23 791 258 +14 - a W3ADO-5 beacon B 045 31 23 780 257 +15 oa W3ADO-5 beacon B 046 21 23 777 255 +17 i O W3ADO-5 beacon B 047 ao oeiet le Er58 +17 r W3ADO-5 beacon B 048 53 23 776 256 +18 eeds W3ADO-5a gn< i|atd eAt oa ea wy=o W3ADO-5 beacon B 000 34 23 787 257 +16 N W3ADO-5 beacon B 001 40 23 776 256 +18 nR ¬ecn t eti¢ i W3ADO-5 beacon B 002 40 25 785 258 ena htil Ftt W3ADO-5 beacon B 003 40 23 775 255 +19 oestro mi
73, Drew KO4MA
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Sunday, May 24, 2015 12:58 PM To: AMSAT BB Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6 bars using a decent UHF Yagi.
But we have not seen any users other than those using the 28.120 PSK channel on HF normally. We welcome people to experiment with it. Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS tracker http://www.byonics.com/mtt4b sent to space. The PSK31 transponder is a single 3.4" square circuit board made by Brno Universtiy in the Czech Republic. The CPU for controlling bulletins and timing is a simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
PSAT has a single 21" VHF and 72" long HF whip. It has two UHF 6" orthogonal monopoles, all of very thin Nitinol wire.
More details will eventually follow as the page will be updated over the coming weeks. http://aprs.org/psat.html
* PSAT packet telemetry is OK, Digipeater will be off (secondary mission) * PSAT PSK31 transponder is ON with 28.120 MHz uplink! (primary mission) * WOD data fixed. Spin data now available. Right now it is at 3 RPM with +Z pointing 45 deg off Sun * Launch TLE elements (below) are still very good * http://PCSAT.APRS.ORG web page is now capturing PSAT telelmetry that users inject into the APRS-IS * BRICSAT telemetry has been heard but is cycling OFF due to low power * BRICSAT PSK31 downlink (also FM) has also been heard barely (when ON) * USS Langley not heard
FREQUENCIES:
PSAT: 145.825 - 1200 baud AX.25 telemetry - digi off PSAT PSK31-5: 435.350 FM down, 28.120 SSB PK31 uplink - Brno University Xponder
BRICsat: 437.975 - 9600 baud telemetry evry 20s BRICsat PSK31-6 - same as PSAT but PSK TLM on 375 Hz (PSAT on 315 Hz)
USS Langley - 437.475 9600 baud telemetry <== CORRECTION
ULTRASat3 <these are still tracking well> 1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009 2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
Bob, WB4APR _______________________________________________ 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: http://www.amsat.org/mailman/listinfo/amsat-bb
Bob,
Below is my capture from the 1400 UTC pass over Nashville today. I noticed 2 Doppler shifted signals, but also one nearly vertical indicating they were compensating. The local terrain is too irregular to get a good AOS time, but I found that the signal was 4 KHz low, +/- about 500 Hz over the pass. That is about what I saw Sunday.
Still no Keps from Space Track.
73s,
Alan WA4SCA
W3ADO-5 beacon B Ø33 Ø9 23 788 259 +1Ø W3ADO-5 beacon B Ø34 59 23 787 258 +12 t,Ã W3ADO-5 beacon B Ø35 25 23 786 257 +13 Ito ottoc.e eP tet W3ADO-5 beacon B Ø36 4Ø 23 79Ø 255 +12 eilo W3ADO-5 beacon B Ø37 37 23 782 257 +14 e - W3ADO-5 beacon B Ø38 34 29 793 257 +8 i W3ADO-5 beacon B Ø39 53 23 785 26Ø +12 oV - W3ADO-5 beacon B Ø4 s 34 23 799 257 +7 y - W3ADO-5 beacon B Ø41 34 23 787 257 +9 ¾ W3ADO-5 beacon B Ø42 Ø6 23 782 26Ø +12 }w W3ADO-5 beacon B Ø43 71 22 781 E"9 +14 - W3ADO-5 beacon B Ø44 34 23 791 258 +s 4 W3ADO-5 beacon B Ø45 31 23 78Ø 257 +15 =n W3ADO-5 beacon B Øs6 21 23 777 255 +17 o W3ADO-5 beacon B Ø47 65 23 777 258 +17 iMn W3ADO-5 beacon B Ø48 53 23 776 256 +18 - W3ADO-5 beacon B ØØØ 34 23 787 257 +16 QX W3ADO-5 beacon B ØØ1 4Ø 23 776 256 +18 - W3ADO-5 beacon B ØØ2 4Ø 25 785 258 +17 W3ADO-5 beacon B ØØ3 4Ø 23 775 255 +19 edt - W3ADO-5 beacon B ØØ4 34 32 79Ø 257 +13 to - W3ADO-5 beacon B ØØ7 31 23 785 257 +11 tv
Congratulations Bob and USNA on another successful spacecraft.
I listened for the first time this morning and could hear the beacon and transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every now and again.
What determines if the carrier is on or off. - Beacon timing.- OK, but is the transmitter also PSK activated in someway? Or is it a timer. Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6 bars using a decent UHF Yagi.
But we have not seen any users other than those using the 28.120 PSK channel on HF normally. We welcome people to experiment with it. Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS tracker http://www.byonics.com/mtt4b sent to space. The PSK31 transponder is a single 3.4" square circuit board made by Brno Universtiy in the Czech Republic. The CPU for controlling bulletins and timing is a simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
PSAT PSK31 is always in AUTO mode. It will come up whenever it hears PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF g0mrf@aol.com wrote:
Congratulations Bob and USNA on another successful spacecraft.
I listened for the first time this morning and could hear the beacon and transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every now and again.
What determines if the carrier is on or off. - Beacon timing.- OK, but is the transmitter also PSK activated in someway? Or is it a timer. Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6 bars using a decent UHF Yagi.
But we have not seen any users other than those using the 28.120 PSK channel on HF normally. We welcome people to experiment with it. Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space. The PSK31 transponder is a single 3.4" square circuit board made by Brno Universtiy in the Czech Republic. The CPU for controlling bulletins and timing is a simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
Is the uplink on 28.120 + audio or does the psk31 signal need to be at 28.120 i.e. 28.119 USB with 1000 Hz psk31?
I copied some beacons but didn't see anything from my attempt to uplink.
73 Mike kc9doa
On 27 May 2015 at 10:41, Robert Bruninga wrote:
PSAT PSK31 is always in AUTO mode. It will come up whenever it hears PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF g0mrf@aol.com wrote:
Congratulations Bob and USNA on another successful
spacecraft.
I listened for the first time this morning and could hear the
beacon and
transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every now
and again.
What determines if the carrier is on or off. - Beacon
timing.- OK, but is
the transmitter also PSK activated in someway? Or is it a
timer.
Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6
bars using a
decent UHF Yagi.
But we have not seen any users other than those using the
28.120
PSK channel on HF normally. We welcome people to experiment with
it.
Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space. The PSK31
transponder is
a single 3.4" square circuit board made by Brno Universtiy in
the
Czech Republic. The CPU for controlling bulletins and timing is
a
simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
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: http://www.amsat.org/mailman/listinfo/amsat-bb
Mike, I used my day to day DM780 settings. Dial setting was 28.120 and I just picked the middle of the waterfall to TX.
On the RX, you need to keep the cursor moving as the trace moves quickly. It does not stay in one place like normal psk
73, Ted K7TRK
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Mike Miller Sent: Wednesday, May 27, 2015 12:13 PM To: Robert Bruninga Cc: amsat bb Subject: Re: [amsat-bb] PSAT- transmission sequence
Is the uplink on 28.120 + audio or does the psk31 signal need to be at 28.120 i.e. 28.119 USB with 1000 Hz psk31?
I copied some beacons but didn't see anything from my attempt to uplink.
73 Mike kc9doa
On 27 May 2015 at 10:41, Robert Bruninga wrote:
PSAT PSK31 is always in AUTO mode. It will come up whenever it hears PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF g0mrf@aol.com wrote:
Congratulations Bob and USNA on another successful
spacecraft.
I listened for the first time this morning and could hear the
beacon and
transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every now
and again.
What determines if the carrier is on or off. - Beacon
timing.- OK, but is
the transmitter also PSK activated in someway? Or is it a
timer.
Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6
bars using a
decent UHF Yagi.
But we have not seen any users other than those using the
28.120
PSK channel on HF normally. We welcome people to experiment with
it.
Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space. The PSK31
transponder is
a single 3.4" square circuit board made by Brno Universtiy in
the
Czech Republic. The CPU for controlling bulletins and timing is
a
simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
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: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ 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: http://www.amsat.org/mailman/listinfo/amsat-bb
Okay, I must be misunderstanding how this works. I thought the down link was FM like the beacon which for me is at 308 Hz on the waterfall.
73 Mike kc9doa
On 27 May 2015 at 12:37, Mike wrote:
Mike, I used my day to day DM780 settings. Dial setting was 28.120 and I just picked the middle of the waterfall to TX.
On the RX, you need to keep the cursor moving as the trace moves quickly. It does not stay in one place like normal psk
73, Ted K7TRK
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Mike Miller Sent: Wednesday, May 27, 2015 12:13 PM To: Robert Bruninga Cc: amsat bb Subject: Re: [amsat-bb] PSAT- transmission sequence
Is the uplink on 28.120 + audio or does the psk31 signal need to be at 28.120 i.e. 28.119 USB with 1000 Hz psk31?
I copied some beacons but didn't see anything from my attempt to uplink.
73 Mike kc9doa
On 27 May 2015 at 10:41, Robert Bruninga wrote:
PSAT PSK31 is always in AUTO mode. It will come up whenever
it hears
PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF
wrote:
Congratulations Bob and USNA on another successful
spacecraft.
I listened for the first time this morning and could hear
the
beacon and
transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every
now
and again.
What determines if the carrier is on or off. - Beacon
timing.- OK, but is
the transmitter also PSK activated in someway? Or is it a
timer.
Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with
6
bars using a
decent UHF Yagi.
But we have not seen any users other than those using the
28.120
PSK channel on HF normally. We welcome people to experiment
with
it.
Everyone within the 28.120 to 28.123 MHz ten meter passband will be
uplinked
and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power
(we are
keeping the APRS digipeater off to allow max power for
PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space. The
PSK31
transponder is
a single 3.4" square circuit board made by Brno Universtiy
in
the
Czech Republic. The CPU for controlling bulletins and timing
is
a
simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U
package since
the flight was available and it gave us more power for our
NON-SPACE
solar cells. We are using standard silicon that are only
half as
efficient as multi-junction cells, but only cost 1% as
much.
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: http://www.amsat.org/mailman/listinfo/amsat-bb
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: http://www.amsat.org/mailman/listinfo/amsat-bb
It is, but your uplink signal is going to be Doppler shifted, so it's going to drift through the waterfall (+/- 0.7 kHz through a pass), unless you are controlling your transmit frequency for Doppler.
73,
Paul, N8HM
On Wed, May 27, 2015 at 3:50 PM, Mike Miller lists@kc9doa.com wrote:
Okay, I must be misunderstanding how this works. I thought the down link was FM like the beacon which for me is at 308 Hz on the waterfall.
73 Mike kc9doa
On 27 May 2015 at 12:37, Mike wrote:
Mike, I used my day to day DM780 settings. Dial setting was 28.120 and I just picked the middle of the waterfall to TX.
On the RX, you need to keep the cursor moving as the trace moves quickly. It does not stay in one place like normal psk
73, Ted K7TRK
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Mike Miller Sent: Wednesday, May 27, 2015 12:13 PM To: Robert Bruninga Cc: amsat bb Subject: Re: [amsat-bb] PSAT- transmission sequence
Is the uplink on 28.120 + audio or does the psk31 signal need to be at 28.120 i.e. 28.119 USB with 1000 Hz psk31?
I copied some beacons but didn't see anything from my attempt to uplink.
73 Mike kc9doa
On 27 May 2015 at 10:41, Robert Bruninga wrote:
PSAT PSK31 is always in AUTO mode. It will come up whenever
it hears
PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF
wrote:
Congratulations Bob and USNA on another successful
spacecraft.
I listened for the first time this morning and could hear
the
beacon and
transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop every
now
and again.
What determines if the carrier is on or off. - Beacon
timing.- OK, but is
the transmitter also PSK activated in someway? Or is it a
timer.
Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with
6
bars using a
decent UHF Yagi.
But we have not seen any users other than those using the
28.120
PSK channel on HF normally. We welcome people to experiment
with
it.
Everyone within the 28.120 to 28.123 MHz ten meter passband will be
uplinked
and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power
(we are
keeping the APRS digipeater off to allow max power for
PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space. The
PSK31
transponder is
a single 3.4" square circuit board made by Brno Universtiy
in
the
Czech Republic. The CPU for controlling bulletins and timing
is
a
simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U
package since
the flight was available and it gave us more power for our
NON-SPACE
solar cells. We are using standard silicon that are only
half as
efficient as multi-junction cells, but only cost 1% as
much.
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: http://www.amsat.org/mailman/listinfo/amsat-bb
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: http://www.amsat.org/mailman/listinfo/amsat-bb
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: http://www.amsat.org/mailman/listinfo/amsat-bb
Thanks Paul,
The doppler would be enough to prevent the decode, but not enough to prevent me from seeing the trace, if I hit the bandpass. So far I haven't seen anything but the beacon and maybe something that looked like one of the MFSK type modes. Do you know the frequency of the actual center of the uplink bandpass and how wide it is?
73 Mike kc9doa
On 27 May 2015 at 15:53, Paul Stoetzer wrote:
It is, but your uplink signal is going to be Doppler shifted, so it's going to drift through the waterfall (+/- 0.7 kHz through a pass), unless you are controlling your transmit frequency for Doppler.
73,
Paul, N8HM
On Wed, May 27, 2015 at 3:50 PM, Mike Miller lists@kc9doa.com wrote:
Okay, I must be misunderstanding how this works. I thought
the
down link was FM like the beacon which for me is at 308 Hz
on
the waterfall.
73 Mike kc9doa
On 27 May 2015 at 12:37, Mike wrote:
Mike, I used my day to day DM780 settings. Dial setting
was
28.120 and I just picked the middle of the waterfall to TX.
On the RX, you need to keep the cursor moving as the trace moves quickly. It does not stay in one place like normal psk
73, Ted K7TRK
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf
Of
Mike Miller Sent: Wednesday, May 27, 2015 12:13 PM To: Robert Bruninga Cc: amsat bb Subject: Re: [amsat-bb] PSAT- transmission sequence
Is the uplink on 28.120 + audio or does the psk31 signal
need
to be at 28.120 i.e. 28.119 USB with 1000 Hz psk31?
I copied some beacons but didn't see anything from my
attempt
to uplink.
73 Mike kc9doa
On 27 May 2015 at 10:41, Robert Bruninga wrote:
PSAT PSK31 is always in AUTO mode. It will come up
whenever
it hears
PSK31 on the 28.120 uplink.
Bob, WB4APR
On Wed, May 27, 2015 at 9:54 AM, David G0MRF
wrote:
Congratulations Bob and USNA on another successful
spacecraft.
I listened for the first time this morning and could
hear
the
beacon and
transponded PSK31 without any trouble.
But I was not expecting the 435.350 carrier to stop
every
now
and again.
What determines if the carrier is on or off. - Beacon
timing.- OK, but is
the transmitter also PSK activated in someway? Or is it
a
timer.
Very nice for saving power.
Thanks
David G0MRF
-----Original Message----- From: Robert Bruninga bruninga@usna.edu To: AMSAT BB amsat-bb@amsat.org Sent: Sun, 24 May 2015 17:58 Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting
with
6
bars using a
decent UHF Yagi.
But we have not seen any users other than those using
the
28.120
PSK channel on HF normally. We welcome people to
experiment
with
it.
Everyone within the 28.120 to 28.123 MHz ten meter passband will
be
uplinked
and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of
power
(we are
keeping the APRS digipeater off to allow max power for
PSK31).
PSAT 's radio and packet system are a simple $250 APRS trackerhttp://www.byonics.com/mtt4b sent to space.
The
PSK31
transponder is
a single 3.4" square circuit board made by Brno
Universtiy
in
the
Czech Republic. The CPU for controlling bulletins and
timing
is
a
simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U
package since
the flight was available and it gave us more power for
our
NON-SPACE
solar cells. We are using standard silicon that are
only
half as
efficient as multi-junction cells, but only cost 1% as
much.
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open
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Subscription settings:
Transponder works well even on a 12-13 degree pass here. Beacon decodes on a separate track. TX from 10m SSB shows up separately. You will need to keep moving your cursor (at least in DM780) to track and decode the SSB. Now, all I need is a better pass and someone to answer
73, K7TRK Following is copy of text for that pass:
"18:30:16> Main O t e xADO-5 beacon B 1Ø4 96 23 828 262 +1 pd}eeut P taeRi in Oregon PSE K e tlo escdn Oregon PSE K e e 7TRK CQ CQ CQ de K7Tte_ X7TRK KPie fht u, r AT de K7TRK K7TRK CQ CQ CQ de K7TRK K7TRK K7TRK in Oregon PSE K beacon B ØØØ 4Ø 24 832 246 +12 e la W3ADO-5 beacon B ØØ1 99 26 821 252 +15 _t t W3ADO-5 beacon B ØØ2 18 23 821 252 "17 t3ADO-5 beacon B ØØ3 31 23 822 251 +18 W3ADO-5 beaconØao 34 23 827 2C219 _ W3ADO-5 beacon B ØØ5 31 23 859 244 +13 ( W3AD too ,i ? tS - U oW CQ CQ Cm CQ aFe"
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga Sent: Sunday, May 24, 2015 9:58 AM To: AMSAT BB Subject: [amsat-bb] PSAT Status (day 4)
PSAT PSK31 435.350 MHz FM downlink is full quieting with 6 bars using a decent UHF Yagi.
But we have not seen any users other than those using the 28.120 PSK channel on HF normally. We welcome people to experiment with it. Everyone within the 28.120 to 28.123 MHz ten meter passband will be uplinked and heard on the 435.350 MHz downlink.
The Naval Academy's PSAT seems healthy with plenty of power (we are keeping the APRS digipeater off to allow max power for PSK31).
PSAT 's radio and packet system are a simple $250 APRS tracker http://www.byonics.com/mtt4b sent to space. The PSK31 transponder is a single 3.4" square circuit board made by Brno Universtiy in the Czech Republic. The CPU for controlling bulletins and timing is a simple Parallax Basic Stamp.
PSAT is actually only about a 1U cubesat but in a 1.5U package since the flight was available and it gave us more power for our NON-SPACE solar cells. We are using standard silicon that are only half as efficient as multi-junction cells, but only cost 1% as much.
PSAT has a single 21" VHF and 72" long HF whip. It has two UHF 6" orthogonal monopoles, all of very thin Nitinol wire.
More details will eventually follow as the page will be updated over the coming weeks. http://aprs.org/psat.html
* PSAT packet telemetry is OK, Digipeater will be off (secondary mission) * PSAT PSK31 transponder is ON with 28.120 MHz uplink! (primary mission) * WOD data fixed. Spin data now available. Right now it is at 3 RPM with +Z pointing 45 deg off Sun * Launch TLE elements (below) are still very good * http://PCSAT.APRS.ORG web page is now capturing PSAT telelmetry that users inject into the APRS-IS * BRICSAT telemetry has been heard but is cycling OFF due to low power * BRICSAT PSK31 downlink (also FM) has also been heard barely (when ON) * USS Langley not heard
FREQUENCIES:
PSAT: 145.825 - 1200 baud AX.25 telemetry - digi off PSAT PSK31-5: 435.350 FM down, 28.120 SSB PK31 uplink - Brno University Xponder
BRICsat: 437.975 - 9600 baud telemetry evry 20s BRICsat PSK31-6 - same as PSAT but PSK TLM on 375 Hz (PSAT on 315 Hz)
USS Langley - 437.475 9600 baud telemetry <== CORRECTION
ULTRASat3 <these are still tracking well> 1 99993U 15140.67013889 .00040043 00000-0 10235-2 0 00009 2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014
Bob, WB4APR _______________________________________________ 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: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (7)
-
Alan -
Andrew Glasbrenner -
David G0MRF -
Mike -
Mike Miller -
Paul Stoetzer -
Robert Bruninga