Hello, I am very interesting to know how many peoples in the world have my, and not only mine..problem for receive ISS SSTV on 145.800. The problem is the repeater (7a) at 145.787.5 and ISS , for doppler naturally go down 145.800 and its impossible to receive well if someone talk on repeater. Thanks for attention. Carlo IK5JRZ.
What repeater are you referring to exactly?
73, John Brier KG4AKV
On Sun, Nov 29, 2020, 16:51 ik5jrz--- via AMSAT-BB amsat-bb@amsat.org wrote:
Hello, I am very interesting to know how many peoples in the world have my, and not only mine..problem for receive ISS SSTV on 145.800. The problem is the repeater (7a) at 145.787.5 and ISS , for doppler naturally go down 145.800 and its impossible to receive well if someone talk on repeater. Thanks for attention. Carlo IK5JRZ. _______________________________________________ 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
This situation doesn't happen in IARU R2, as 145.790-145.800 is a protection segment.
In IARU R1, there is no such a protection, suggest request change thru your IARU Rep.
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On 11/29/20, John Brier via AMSAT-BB amsat-bb@amsat.org wrote:
What repeater are you referring to exactly?
73, John Brier KG4AKV
On Sun, Nov 29, 2020, 16:51 ik5jrz--- via AMSAT-BB amsat-bb@amsat.org wrote:
Hello, I am very interesting to know how many peoples in the world have my, and not only mine..problem for receive ISS SSTV on 145.800. The problem is the repeater (7a) at 145.787.5 and ISS , for doppler naturally go down 145.800 and its impossible to receive well if someone talk on repeater. Thanks for attention. Carlo IK5JRZ. _______________________________________________ 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
According to the band plan reported on the ARI web site, the space communication band is protected starting at 145.794 Mhz, i.e. 6 Khz below 145.800 Mhz. The R7a is indeed at 145.7875 Mhz with a bandwidth of 12 Khz there shouldn't be any interference (in theory). Have you checked which repeater is in your (our) zone ?
Ciao Fabrizio IU5GEZ
Il giorno dom 29 nov 2020 alle ore 23:11 Pedro Converso via AMSAT-BB < amsat-bb@amsat.org> ha scritto:
This situation doesn't happen in IARU R2, as 145.790-145.800 is a protection segment.
In IARU R1, there is no such a protection, suggest request change thru your IARU Rep.
On 11/29/20, John Brier via AMSAT-BB amsat-bb@amsat.org wrote:
What repeater are you referring to exactly?
73, John Brier KG4AKV
On Sun, Nov 29, 2020, 16:51 ik5jrz--- via AMSAT-BB amsat-bb@amsat.org wrote:
Hello, I am very interesting to know how many peoples in the world have my, and not only mine..problem for receive ISS SSTV on 145.800. The problem is the repeater (7a) at 145.787.5 and ISS , for doppler naturally go down 145.800 and its impossible to receive well if someone talk on repeater. Thanks for attention. Carlo IK5JRZ. _______________________________________________ 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
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
Fabrizio IU5GEZ wrote: "The R7a is indeed at 145.7875 Mhz with a bandwidth of 12 Khz there shouldn't be any interference (in theory). Have you checked which repeater is in your (our) zone ?" Remember due to Doppler shift the ISS signal can be as low as 145.7965 MHz.
While the Necessary Bandwidth of the repeater on R7a would be about 11 kHz the FM sidebands will extend beyond that and make it impossible for any local stations to receive the ISS downlink.
It is unfortunate IARU Region 1 chose to put a repeater channel so close. 73 Trevor M5AKA
participants (5)
-
Fabrizio Carrai -
ik5jrz＠tin.it -
John Brier -
M5AKA -
Pedro Converso