I saw on one of the NASA announcements that the snarffled 70cm antenna would mean no commanding of the bird. (This was probably before it was realized that that receive actually seems to work). But the question I have is whether there IS some commanding of the bird possible. I guess you have to be able to turn it off to satisfy the FCC (true?) but can other things be done? I assume/home that the command channel is encrypted, so disclosing its existance is not compromising the bird.
73, Burns W2BFJ
On 5 Aug 2011 at 14:03, Burns Fisher wrote:
Date sent: Fri, 05 Aug 2011 14:03:56 -0400 From: Burns Fisher burns@fisher.cc Subject: [amsat-bb] Arissat-1 Commanding? To: amsat-bb@amsat.org
I saw on one of the NASA announcements that the snarffled 70cm antenna would mean no commanding of the bird. (This was probably before it was realized that that receive actually seems to work). But the question I have is whether there IS some commanding of the bird possible. I guess you have to be able to turn it off to satisfy the FCC (true?) but can other things be done? I assume/home that the command channel is encrypted, so disclosing its existance is not compromising the bird.
73, Burns W2BFJ _______________________________________________
As per my and other linear transponder test signal pass through but they are not too strong even if some report seems to confirm 1 watt power their EIRP is unknown assuming the command channel is on UHF but you know the word "assume" definition:)
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE
On 8/5/11 11:03 AM, Burns Fisher wrote:
I saw on one of the NASA announcements that the snarffled 70cm antenna would mean no commanding of the bird. (This was probably before it was realized that that receive actually seems to work). But the question I have is whether there IS some commanding of the bird possible. I guess you have to be able to turn it off to satisfy the FCC (true?) but can other things be done? I assume/home that the command channel is encrypted, so disclosing its existance is not compromising the bird.
The satellite is operating under a Russian license, so I assume the FCC would have no jurisdiction over it.
In any event, the fact that the transponder seems to work well indicates that the spacecraft should have no trouble hearing commands.
Phil
The radio regulations govern here. Both the USA and Russian administrations are signatory parties, along with about all others around the world.
The pertinent provision is:
RR 22.1 Space stations shall be fitted with devices to ensure immediate cessation of their radio emissions by telecommand, whenever such cessation is required under the provisions of these Regulations.
This applies to all space stations in all radio communication services.
More information on this topic is at Controlling Satellites on the IARU web site.
Responsibility for the space station lies with the authorizing administration.
I hope this helps.
73, art….. W4ART Arlington VA
On 5-Aug-2011, at 06:40 PM, Phil Karn wrote:
On 8/5/11 11:03 AM, Burns Fisher wrote:
I saw on one of the NASA announcements that the snarffled 70cm antenna would mean no commanding of the bird. (This was probably before it was realized that that receive actually seems to work). But the question I have is whether there IS some commanding of the bird possible. I guess you have to be able to turn it off to satisfy the FCC (true?) but can other things be done? I assume/home that the command channel is encrypted, so disclosing its existance is not compromising the bird.
The satellite is operating under a Russian license, so I assume the FCC would have no jurisdiction over it.
In any event, the fact that the transponder seems to work well indicates that the spacecraft should have no trouble hearing commands.
Phil
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
The radio regulations govern here. Both the USA and Russian administrations are signatory parties, along with about all others around the world.
The pertinent provision is:
RR 22.1 Space stations shall be fitted with devices to ensure immediate cessation of their radio emissions by telecommand, whenever such cessation is required under the provisions of these Regulations.
This applies to all space stations in all radio communication services.
More information on this topic is at http://www.iaru.org/satellite/ControllingSatellitesV27.pdf on the IARU web site.
Responsibility for the space station lies with the authorizing administration.
I hope this helps.
73, art….. W4ART Arlington VA
On 5-Aug-2011, at 06:40 PM, Phil Karn wrote:
On 8/5/11 11:03 AM, Burns Fisher wrote:
I saw on one of the NASA announcements that the snarffled 70cm antenna would mean no commanding of the bird. (This was probably before it was realized that that receive actually seems to work). But the question I have is whether there IS some commanding of the bird possible. I guess you have to be able to turn it off to satisfy the FCC (true?) but can other things be done? I assume/home that the command channel is encrypted, so disclosing its existance is not compromising the bird.
The satellite is operating under a Russian license, so I assume the FCC would have no jurisdiction over it.
In any event, the fact that the transponder seems to work well indicates that the spacecraft should have no trouble hearing commands.
Phil
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 (4)
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Burns Fisher -
Luc Leblanc -
Phil Karn -
W4ART Arthur Feller