PSAT2 SSTV/telemetry intervals?
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
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There is quite a bit of detail on the possible modes of PSAT-2 operation at:
https://github.com/alpov/PSAT-2/blob/master/README.md
... so far, I've seen both PSK31 and SSTV in the 70cm downlink. However, at such low elevations I am not getting enough signal to determine exactly what the current pattern of operation is.
However, on the 2m downlink (145.825), the activity has picked up each night as the rising elevation makes PSAT-2 available to more folks. Please remember to transmit in NARROW-FM mode and if your radio has CAT control and you can doppler-correct your uplink, better yet.
-Scott, K4KDR
==========================
On Fri, Jul 5, 2019 at 9:28 PM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
Thanks for the link, I hadn't seen that page, yet.
As for 2m: I have a nasty local case of interference here which wipes out 145.825 in most directions (local electronic billboard), so I'm not active with APRS.
BTW, what do you mean by NARROW-FM? I take it that it is the deviation of the FM signal, with narrow being 2.5 kHz, right?
73 de Hans
BX2ABT
On 07/06/2019 09:42 AM, Scott via AMSAT-BB wrote:
There is quite a bit of detail on the possible modes of PSAT-2 operation at:
https://github.com/alpov/PSAT-2/blob/master/README.md
... so far, I've seen both PSK31 and SSTV in the 70cm downlink. However, at such low elevations I am not getting enough signal to determine exactly what the current pattern of operation is.
However, on the 2m downlink (145.825), the activity has picked up each night as the rising elevation makes PSAT-2 available to more folks. Please remember to transmit in NARROW-FM mode and if your radio has CAT control and you can doppler-correct your uplink, better yet.
-Scott, K4KDR
==========================
On Fri, Jul 5, 2019 at 9:28 PM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
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
I have not looked up the deviation for narroband FM, but just choose that modulation method in the Kenwood Modulation menu. It is either FM or NFM. I assume NFM is what is the default in Europe?
Bob
On Sat, Jul 6, 2019 at 9:15 AM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Thanks for the link, I hadn't seen that page, yet.
As for 2m: I have a nasty local case of interference here which wipes out 145.825 in most directions (local electronic billboard), so I'm not active with APRS.
BTW, what do you mean by NARROW-FM? I take it that it is the deviation of the FM signal, with narrow being 2.5 kHz, right?
73 de Hans
BX2ABT
On 07/06/2019 09:42 AM, Scott via AMSAT-BB wrote:
There is quite a bit of detail on the possible modes of PSAT-2 operation
at:
https://github.com/alpov/PSAT-2/blob/master/README.md
... so far, I've seen both PSK31 and SSTV in the 70cm downlink. However, at such low elevations I am not getting enough signal to determine
exactly
what the current pattern of operation is.
However, on the 2m downlink (145.825), the activity has picked up each night as the rising elevation makes PSAT-2 available to more folks.
Please
remember to transmit in NARROW-FM mode and if your radio has CAT control and you can doppler-correct your uplink, better yet.
-Scott, K4KDR
==========================
On Fri, Jul 5, 2019 at 9:28 PM Hans BX2ABT via AMSAT-BB <
amsat-bb@amsat.org>
wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
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
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
I've got a Kenwood TH-F7E and NFM is 2.5 kHz, FM is 5.0 kHz. In Europe we do indeed try to use NFM. 73 de Hans BX2ABT
On 07/07/2019 12:34 AM, Robert Bruninga wrote:
I have not looked up the deviation for narroband FM, but just choose that modulation method in the Kenwood Modulation menu. It is either FM or NFM. I assume NFM is what is the default in Europe?
Bob
On Sat, Jul 6, 2019 at 9:15 AM Hans BX2ABT via AMSAT-BB <amsat-bb@amsat.org mailto:amsat-bb@amsat.org> wrote:
Thanks for the link, I hadn't seen that page, yet. As for 2m: I have a nasty local case of interference here which wipes out 145.825 in most directions (local electronic billboard), so I'm not active with APRS. BTW, what do you mean by NARROW-FM? I take it that it is the deviation of the FM signal, with narrow being 2.5 kHz, right? 73 de Hans BX2ABT On 07/06/2019 09:42 AM, Scott via AMSAT-BB wrote: > There is quite a bit of detail on the possible modes of PSAT-2 operation at: > > https://github.com/alpov/PSAT-2/blob/master/README.md > > ... so far, I've seen both PSK31 and SSTV in the 70cm downlink. However, > at such low elevations I am not getting enough signal to determine exactly > what the current pattern of operation is. > > However, on the 2m downlink (145.825), the activity has picked up each > night as the rising elevation makes PSAT-2 available to more folks. Please > remember to transmit in NARROW-FM mode and if your radio has CAT control > and you can doppler-correct your uplink, better yet. > > -Scott, K4KDR > > ========================== > > On Fri, Jul 5, 2019 at 9:28 PM Hans BX2ABT via AMSAT-BB <amsat-bb@amsat.org <mailto:amsat-bb@amsat.org>> > wrote: > >> Nobody knows? Here in east Asia some other hams are asking the same. We >> have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at >> all. --Hans BX2ABT >> >> >> On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote: >>> Hello all. At what intervals do the SSTV and PSK31 telemetry get >>> broadcast? Just had another good pass, saw some SSTV in the beginning, >>> but until LOS not a single blip heard. Same yesterday. What gives? 73 >>> de Hans > _______________________________________________ > Sent via AMSAT-BB@amsat.org <mailto: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 > > > _______________________________________________ Sent via AMSAT-BB@amsat.org <mailto: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
Hi Hans, as you can see from documents mentioned above, the timing depends on battery voltage, which selects one of four operating modes, but basically we are lucky to be in highest mode A which means every 2 minutes PSK telemetry and every second telementry frame is twice longer and contains also SSTV picture. All of this is overdriven by sunwire logic signal going low. That means no transmission on UHF downlink after going in eclipse for maximum of 30 minutes (failsafe timer). If you will transmit on uplink and your signal will be sensed, it will switch on the downlink for the next 20s. Tomas OK2PNQ and Ales OK2ALP
Dne 6.7.2019 v 15:15 Hans BX2ABT via AMSAT-BB napsal(a):
Thanks for the link, I hadn't seen that page, yet.
As for 2m: I have a nasty local case of interference here which wipes out 145.825 in most directions (local electronic billboard), so I'm not active with APRS.
BTW, what do you mean by NARROW-FM? I take it that it is the deviation of the FM signal, with narrow being 2.5 kHz, right?
73 de Hans
BX2ABT
On 07/06/2019 09:42 AM, Scott via AMSAT-BB wrote:
There is quite a bit of detail on the possible modes of PSAT-2 operation at:
https://github.com/alpov/PSAT-2/blob/master/README.md
... so far, I've seen both PSK31 and SSTV in the 70cm downlink. However, at such low elevations I am not getting enough signal to determine exactly what the current pattern of operation is.
However, on the 2m downlink (145.825), the activity has picked up each night as the rising elevation makes PSAT-2 available to more folks. Please remember to transmit in NARROW-FM mode and if your radio has CAT control and you can doppler-correct your uplink, better yet.
-Scott, K4KDR
==========================
On Fri, Jul 5, 2019 at 9:28 PM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
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
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
SSTV operation is entirely bus voltage driven. If there is plenty of voltage, then SSTV will be frequent. If it is dark and battery voltage is blow somehing like 6.8? volts then it will not transmitt SSTV. SSTV takes a lot of power. You can see the bus voltage as the firs channel in the T$SSS,VVV,III, TTT,TTT,... telemetry. Volts is in hundredths.
Bob
On Fri, Jul 5, 2019 at 9:27 PM Hans BX2ABT via AMSAT-BB amsat-bb@amsat.org wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT
On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote:
Hello all. At what intervals do the SSTV and PSK31 telemetry get broadcast? Just had another good pass, saw some SSTV in the beginning, but until LOS not a single blip heard. Same yesterday. What gives? 73 de Hans
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
Thanks Bob, that explains a lot. Yesterday at 1400UTC I did see some PSK31, but too weak to decode. So basically after 11UTC no need to try PSAT2 then. Cheers,
Hans
BX2ABT
On 07/06/2019 10:15 AM, Robert Bruninga wrote:
SSTV operation is entirely bus voltage driven. If there is plenty of voltage, then SSTV will be frequent. If it is dark and battery voltage is blow somehing like 6.8? volts then it will not transmitt SSTV. SSTV takes a lot of power. You can see the bus voltage as the firs channel in the T$SSS,VVV,III, TTT,TTT,... telemetry. Volts is in hundredths.
Bob
On Fri, Jul 5, 2019 at 9:27 PM Hans BX2ABT via AMSAT-BB <amsat-bb@amsat.org mailto:amsat-bb@amsat.org> wrote:
Nobody knows? Here in east Asia some other hams are asking the same. We have good passes late at night (1400 UTC), but no PSK31 or SSTV seen at all. --Hans BX2ABT On 07/04/2019 10:48 PM, Hans BX2ABT via AMSAT-BB wrote: > Hello all. At what intervals do the SSTV and PSK31 telemetry get > broadcast? Just had another good pass, saw some SSTV in the beginning, > but until LOS not a single blip heard. Same yesterday. What gives? 73 > de Hans > > _______________________________________________ > Sent via AMSAT-BB@amsat.org <mailto: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 > > > _______________________________________________ Sent via AMSAT-BB@amsat.org <mailto: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 (4)
-
Hans BX2ABT -
Robert Bruninga -
Scott -
Tomáš Urbanec