[amsat-bb] Re: Question about Prospero downlink

Trevor . m5aka at yahoo.co.uk
Tue Oct 25 08:42:34 PDT 2011

--- On Tue, 25/10/11, Raidel Abreu Espinet <cl2esp at frcuba.co.cu> wrote:
> Just a little question. Is the Prospero downlink active
> only after recieved command from ground station or it should be 
> active world wide? I would like to try recieve any signal but not 
> sure if it will be transmitting over Cuba and the Caribbean.

Hi Raidel, 

I'm sure Roger will correct me if I'm wrong but my understanding is that the downlink will only be active within range of the United Kingdom so not receivable in Cuba. This is being done to avoid causing interference to other satellites using the band. 

--- On Tue, 25/10/11, PE0SAT <pe0sat at vgnet.nl> wrote:
> "The v.h.f. system is conventional using twin transmitters, each with 
> an output of 350mW at approximately 136 MHz, and a twin tone
> digital command system operating at about 148 MHz which handles 
> the 35 separate commands"

Hi Jan, 

I read those words as saying: 

There are two transmitters onboard which are both capable of operating in the 136 MHz Band.

The command receiver operates in the 148 MHz Band. 
A two audio tone system (I guess much like DTMF ?) is used by the ground station to send up to 35 different commands.

73 Trevor M5AKA

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