Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems? Dick G4BBH .
--- On Mon, 19/11/12, Richard Ferryman [email protected] wrote:
Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to that the Amateur Service had I believe been able to use any Amateur Frequencies just as they can still do for that other form of Space Communication - Moon Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite frequencies a few times in his column in 73 Magazine from that era, see 73 Mag archive at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created they were only given access a limited sub-set of the Amateur Service frequencies. For the UHF and Microwave bands the satellite segments were all remote from the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have seemed "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz transvertors that only covered a narrow 2 MHz segment of the band. We share 432-438 MHz with commercial SAR satellites but why in the 70's we weren't allowed to use the whole of 432-438 I do not know. Maybe no-one thought to ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40 years ago (but not to Moonbounce) still have any relevance today ? again I don't know.
Ideally the Amateur-satellite Service should have access to the weak-signal segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on each band for both terrestrial and satellite working. It would be good if IARU were to work towards that objective.
73 Trevor M5AKA
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman [email protected] wrote:
Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to that the Amateur Service had I believe been able to use any Amateur Frequencies just as they can still do for that other form of Space Communication - Moon Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite frequencies a few times in his column in 73 Magazine from that era, see 73 Mag archive at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created they were only given access a limited sub-set of the Amateur Service frequencies. For the UHF and Microwave bands the satellite segments were all remote from the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have seemed "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz transvertors that only covered a narrow 2 MHz segment of the band. We share 432-438 MHz with commercial SAR satellites but why in the 70's we weren't allowed to use the whole of 432-438 I do not know. Maybe no-one thought to ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40 years ago (but not to Moonbounce) still have any relevance today ? again I don't know.
Ideally the Amateur-satellite Service should have access to the weak-signal segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on each band for both terrestrial and satellite working. It would be good if IARU were to work towards that objective.
73 Trevor M5AKA
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman [email protected] wrote:
Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to that the Amateur Service had I believe been able to use any Amateur Frequencies just as they can still do for that other form of Space Communication - Moon Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite frequencies a few times in his column in 73 Magazine from that era, see 73 Mag archive at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created they were only given access a limited sub-set of the Amateur Service frequencies. For the UHF and Microwave bands the satellite segments were all remote from the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have seemed "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz transvertors that only covered a narrow 2 MHz segment of the band. We share 432-438 MHz with commercial SAR satellites but why in the 70's we weren't allowed to use the whole of 432-438 I do not know. Maybe no-one thought to ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40 years ago (but not to Moonbounce) still have any relevance today ? again I don't know.
Ideally the Amateur-satellite Service should have access to the weak-signal segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on each band for both terrestrial and satellite working. It would be good if IARU were to work towards that objective.
73 Trevor M5AKA
_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
I believe it was Oscar-7.
Greg KO6TH
Alan wrote:
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman[email protected] wrote:
Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to that the Amateur Service had I believe been able to use any Amateur Frequencies just as they can still do for that other form of Space Communication - Moon Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite frequencies a few times in his column in 73 Magazine from that era, see 73 Mag archive at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created they were only given access a limited sub-set of the Amateur Service frequencies. For the UHF and Microwave bands the satellite segments were all remote from the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have seemed "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz transvertors that only covered a narrow 2 MHz segment of the band. We share 432-438 MHz with commercial SAR satellites but why in the 70's we weren't allowed to use the whole of 432-438 I do not know. Maybe no-one thought to ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40 years ago (but not to Moonbounce) still have any relevance today ? again I don't know.
Ideally the Amateur-satellite Service should have access to the weak-signal segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on each band for both terrestrial and satellite working. It would be good if IARU were to work towards that objective.
73 Trevor M5AKA
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
It was AO7 and the freq was 2304 MHz and not 1260. Because the frequency was set in the weak-signal band with no allocation for space-com the system was never activated. A huge disappointment to the members of the SBMS that designed and built it. Politics!
I was a member of the sbms during that time.
Ed - KL7UW, ex K8MWA and ex amsat #3212
At 07:31 PM 11/20/2012, Greg D wrote:
I believe it was Oscar-7.
Greg KO6TH
Alan wrote:
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman[email protected] wrote:
Just curious - Can someone enlighten me as to why there is no allocation for satellite downlinks in L-band (at least in the bandplans I have seen). There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to that the Amateur Service had I believe been able to use any Amateur Frequencies just as they can still do for that other form of Space Communication - Moon Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite frequencies a few times in his column in 73 Magazine from that era, see 73 Mag archive at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created they were only given access a limited sub-set of the Amateur Service frequencies. For the UHF and Microwave bands the satellite segments were all remote from the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have seemed "remote" from the 432 MHz weak-signal area due to the use of 28 to 432 MHz transvertors that only covered a narrow 2 MHz segment of the band. We share 432-438 MHz with commercial SAR satellites but why in the 70's we weren't allowed to use the whole of 432-438 I do not know. Maybe no-one thought to ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global Positioning transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40 years ago (but not to Moonbounce) still have any relevance today ? again I don't know.
Ideally the Amateur-satellite Service should have access to the weak-signal segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on each band for both terrestrial and satellite working. It would be good if IARU were to work towards that objective.
73 Trevor M5AKA
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hi Greg, KO6TH
For the history no OSCAR satellite carried on a Mode-L Beacon.
OSCAR-7 carried on a Mode-S beacon on 2304.1 MHz built by the San Bernardino Microwave Society but it was never officially turned on because of international treaty constraints (bandplan) so that it was not receiving the autorization by the FCC
73" de
i8CVS Domenico
----- Original Message ----- From: "Greg D" [email protected] To: [email protected] Cc: "AMSAT-BB" [email protected] Sent: Wednesday, November 21, 2012 5:31 AM Subject: [amsat-bb] Re: Allocations in L-band
I believe it was Oscar-7.
Greg KO6TH
Alan wrote:
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman[email protected] wrote:
Just curious - Can someone enlighten me as to why there is no
allocation
for satellite downlinks in L-band (at least in the bandplans I have
seen).
There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to
that
the Amateur Service had I believe been able to use any Amateur
Frequencies
just as they can still do for that other form of Space Communication -
Moon
Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite
frequencies
a few times in his column in 73 Magazine from that era, see 73 Mag
archive
at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created
they
were only given access a limited sub-set of the Amateur Service
frequencies.
For the UHF and Microwave bands the satellite segments were all remote
from
the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have
seemed
"remote" from the 432 MHz weak-signal area due to the use of 28 to 432
MHz
transvertors that only covered a narrow 2 MHz segment of the band. We
share
432-438 MHz with commercial SAR satellites but why in the 70's we
weren't
allowed to use the whole of 432-438 I do not know. Maybe no-one thought
to
ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global
Positioning
transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40
years
ago (but not to Moonbounce) still have any relevance today ? again I
don't
know.
Ideally the Amateur-satellite Service should have access to the
weak-signal
segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on
each
band for both terrestrial and satellite working. It would be good if
IARU
were to work towards that objective.
73 Trevor M5AKA
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
For those interested in AO-7, here's the FCC 432 uplink waiver and the denial of the 2304.1 downlink...
http://users.burlingtontelecom.net/[email protected]/images/FCCAO...
watch any wrap...
73, Mike, N1JEZ AMSAT 29649 AO-7 command op "A closed mouth gathers no feet"
----- Original Message ----- From: "i8cvs" [email protected] To: "Greg D" [email protected]; [email protected] Cc: "AMSAT-BB" [email protected] Sent: Wednesday, November 21, 2012 9:23 AM Subject: [amsat-bb] Re: Allocations in L-band
Hi Greg, KO6TH
For the history no OSCAR satellite carried on a Mode-L Beacon.
OSCAR-7 carried on a Mode-S beacon on 2304.1 MHz built by the San Bernardino Microwave Society but it was never officially turned on because of international treaty constraints (bandplan) so that it was not receiving the autorization by the FCC
73" de
i8CVS Domenico
----- Original Message ----- From: "Greg D" [email protected] To: [email protected] Cc: "AMSAT-BB" [email protected] Sent: Wednesday, November 21, 2012 5:31 AM Subject: [amsat-bb] Re: Allocations in L-band
I believe it was Oscar-7.
Greg KO6TH
Alan wrote:
Someone years ago told me that one of the early amateur satellites had a mode-L beacon, but because the rules changed, it was never turned on. I haven't been able to verify or disprove this story.
Alan WA4SCA
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Trevor . Sent: Tuesday, November 20, 2012 4:10 AM To: [email protected] Subject: [amsat-bb] Re: Allocations in L-band
--- On Mon, 19/11/12, Richard Ferryman[email protected] wrote:
Just curious - Can someone enlighten me as to why there is no
allocation
for satellite downlinks in L-band (at least in the bandplans I have
seen).
There are uplinks around 1267 to 1269 MHz. Is it due to possibility of interference with commercial/military/aeronautical systems?
I believe it dates back to a WARC conference in about 1971. Prior to
that
the Amateur Service had I believe been able to use any Amateur
Frequencies
just as they can still do for that other form of Space Communication -
Moon
Bounce (EME).
Wayne Green W2NSD does make references to the loss of satellite
frequencies
a few times in his column in 73 Magazine from that era, see 73 Mag
archive
at http://archive.org/search.php?query=73%20magazine
Although a separate service, the Amateur-satellite Service, was created
they
were only given access a limited sub-set of the Amateur Service
frequencies.
For the UHF and Microwave bands the satellite segments were all remote
from
the terrestrial weak-signal segment meaning separate equipment had to be built to work satellites. Back in those days even 435 MHz would have
seemed
"remote" from the 432 MHz weak-signal area due to the use of 28 to 432
MHz
transvertors that only covered a narrow 2 MHz segment of the band. We
share
432-438 MHz with commercial SAR satellites but why in the 70's we
weren't
allowed to use the whole of 432-438 I do not know. Maybe no-one thought
to
ask for the whole segment ?
The same with 1260-1270, why it's there I don't know perhaps someone can enlighten us. The band 1260-1300 MHz is used for wideband Global
Positioning
transmissions from Galileo, see http://www.southgatearc.org/articles/galileo.htm
Do restrictions that were applied to the Amateur-satellite Service 40
years
ago (but not to Moonbounce) still have any relevance today ? again I
don't
know.
Ideally the Amateur-satellite Service should have access to the
weak-signal
segments of all the UHF and Microwave bands for both Earth-to-Space and Space-to-Earth so we would only need to build one set of equipment on
each
band for both terrestrial and satellite working. It would be good if
IARU
were to work towards that objective.
73 Trevor M5AKA
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (7)
-
Alan -
Edward R Cole -
Greg D -
i8cvs -
Mike Seguin N1JEZ -
Richard Ferryman -
Trevor .