Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)??
Seems like this wasn't very well 'coordin ated'. I hope those freq's were misprints.
----- Original Message ----- From: nx9b@comcast.net To: amsat-bb@amsat.org Sent: Thursday, September 12, 2013 4:14 AM Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)??
Seems like this wasn't very well 'coordinated'. I hope those freq's were misprints.
Hi NX9B
The man responsible for IARU frequency Coordination is ZS6AKV Hans Van de Groenendaal available as belove and he should take care of frequency coordination for IARU Region 1-2 and 3
Someone should complain with him.
73" de i8CVS Domenico
IARU Freq. Coordinator Full Name: IARU Freq. Coordinator Job Title: ZS6AKV Company: Hans Van de Groenendaal P.O. Box 90438 Garsfonstein 0042 South Africa Home: 27-12-991-4662 Mobile: 27-82-781-4631 Bus Fax: 27-12-991-5651 E-mail: satcoord@iaru.org Web Page: http://www.iaru.org/satellite Skype: hanszs6akv1502
... Now you get a new transponder (due to the low orbit for a very limited time) but some still grumble.
73 Mike DK3WN
-----Ursprüngliche Nachricht----- Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im Auftrag von i8cvs Gesendet: Donnerstag, 12. September 2013 05:08 An: nx9b@comcast.net; Amsat - BBs Betreff: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
----- Original Message ----- From: nx9b@comcast.net To: amsat-bb@amsat.org Sent: Thursday, September 12, 2013 4:14 AM Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)??
Seems like this wasn't very well 'coordinated'. I hope those freq's were misprints.
Hi NX9B
The man responsible for IARU frequency Coordination is ZS6AKV Hans Van de Groenendaal available as belove and he should take care of frequency coordination for IARU Region 1-2 and 3
Someone should complain with him.
73" de i8CVS Domenico
IARU Freq. Coordinator Full Name: IARU Freq. Coordinator Job Title: ZS6AKV Company: Hans Van de Groenendaal P.O. Box 90438 Garsfonstein 0042 South Africa Home: 27-12-991-4662 Mobile: 27-82-781-4631 Bus Fax: 27-12-991-5651 E-mail: satcoord@iaru.org Web Page: http://www.iaru.org/satellite Skype: hanszs6akv1502
_______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Jeff,
There is actually very little problem, and even an opportunity, in the frequencies.
FO-29 has a high inclination, while anything deployed from the ISS will be approximately 51 degrees. The overlap of the orbits will be few and short, and may give some interesting double hop opportunities.
SO-50 is a bit more problematic. It has a similar inclination to the ISS, and anything deployed from it. I didn't have time to do a careful calculation, but most of the time their footprints/mutual visibility will not overlap, except for an occasional period of 3-5 orbits.
Finally, anything deployed from the ISS will have a short lifetime, depending greatly on the altitude of the ISS when it is launched.
You can play with a good tracking program such as SatPC32 in multitrack mode to get an idea of how the orbits fit together.
73s,
Alan WA4SCA
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of nx9b@comcast.net Sent: Wednesday, September 11, 2013 9:14 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)??
Seems like this wasn't very well 'coordin ated'. I hope those freq's were misprints. _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
Given there is only 200 kHz of spectrum available for satellites in the 144 MHz band it is unrealistic to think that each satellite can have their own exclusive frequency, sharing is necessary.
If you look at the launches planned for the end of the year you will see many other satellites with downlinks on 2m, there are 3 other satellites with linear transponder downlinks in 145 MHz planned for launch this year plus a number of others with beacon downlinks. Frequency sharing is a fact of life.
BTW there was a move in IARU Region 1 to get another 30 kHz of 144 MHz spectrum assigned to the satellite service. Has anyone in Regions 2 and 3 tried to get additional spectrum ? With the increasing number of satellites we need it.
http://ukamsat.files.wordpress.com/2013/04/vie13_c5_03_increased_amateur_sat...
73 Trevor M5AKA
________________________________ From: Alan wa4sca@gmail.com To: nx9b@comcast.net; amsat-bb@amsat.org Cc: CC APBIDDLE@UNITED.NET Sent: Thursday, 12 September 2013, 14:01 Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
Jeff,
There is actually very little problem, and even an opportunity, in the frequencies.
FO-29 has a high inclination, while anything deployed from the ISS will be approximately 51 degrees. The overlap of the orbits will be few and short, and may give some interesting double hop opportunities.
SO-50 is a bit more problematic. It has a similar inclination to the ISS, and anything deployed from it. I didn't have time to do a careful calculation, but most of the time their footprints/mutual visibility will not overlap, except for an occasional period of 3-5 orbits.
Finally, anything deployed from the ISS will have a short lifetime, depending greatly on the altitude of the ISS when it is launched.
You can play with a good tracking program such as SatPC32 in multitrack mode to get an idea of how the orbits fit together.
73s,
Alan WA4SCA
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of nx9b@comcast.net Sent: Wednesday, September 11, 2013 9:14 PM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: IARU coordinated frequencies for LitSat-1
Did anyone else notice that the transponder downlink frequency is exactly on the center frequency of FO-29's uplink or that the Packet downlink was on the SO-50 uplink (without the 67Hz tone)??
Seems like this wasn't very well 'coordin ated'. I hope those freq's were misprints. _______________________________________________ Sent via AMSAT-BB@amsat.org. 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 AMSAT-BB@amsat.org. 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 (5)
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Alan -
i8cvs -
M5AKA -
Mike Rupprecht -
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