Re: [amsat-bb] Re: PCSAT2 telemetry

["Mark L. Hammond" <mlhammond@xxxxxxxxxxx>]

Question--is this page displaying the 1200 baud telemetry, the 9600 baud telemetry, or both?

I have been receiving 9600 telemetry and am connected to the special server---but I haven't seen my call listed.

Thanks,

Mark N8MH

> 
> From: David Johnson <g4dpz@mac.com>
> Date: 2005/08/05 Fri AM 11:20:41 EDT
> To: Peter Martinez <peter.martinez>
> CC: Amsat BB <amsat-bb@amsat.org>
> Subject: [amsat-bb] Re: PCSAT2 telemetry
> 
> Hi Peter,
> 
> > Your PCSAT2 telemetry page is excellent, but can you help me to  
> > understand a couple of things please.
> 
> Thanks, much appreciated. Here we go....
> 
> >
> > How can I tell the time for which the telemetry data is valid.
> 
> It contain the very latest telemetry received, even if it appears to  
> be old. We currently have only about 12
> stations around the world feeding it. So there's a delay between the  
> UK & VK and ZL and USA.
> The USA to UK delay is only 15 minutes but that depends on the  
> visibilty throughout the day.
> 
> The data is fed from the ground stations into the worldwide APRS  
> network and only takes a
> few seconds to get to my server.
> 
> > The time at the top of the page seems to be the time that the page  
> > was accessed,
> 
> It's just in case someone does a screen capture of the telemetry so  
> that they know the context. The Lat/Long is the
> sub-sat point of the ISS at that time.
> 
> 
> > and the telemetry may be quite a bit older, presumably if no-one  
> > has copied it for a while. The 'frame time' fields seem to be all  
> > different and I can't figure out which (if any) are the times for  
> > the reported telemetry frame.
> 
> The frame time is the time at which it was received by my server  
> rather than at the station.
> 
> To complete the telemetry display takes four packets of data hence,  
> 00, 01, 10, 11 against the Frame Time
> and data element. The colour (in shades of blue) indicates the  
> latency, the brighter the colour, the younger
> the data, saves doing the cross reference back to the frame time when  
> you're reading the data.
> 
> >
> > I am particularly keen to know when the PSK31 transponder is on.  
> > Your web page has a reference to 'PSK Bit' and 'PSK Bkup' and 'PSK  
> > OFF'. How should I know from these whether the PSK31 transponder is  
> > on or off?
> >
> 
> Currently the 'B" side of the device is in use. (a longer explanation  
> can be found about this on Bob's site)
> so only look at the right hand column. The PSK31 will be on then the  
> PSK Off is coloured GREY and off when
> coloured RED, the condition at the moment during testing. We had a  
> situation where Bob turned it on this
> afternoon over Maryland and it didn't get turned off until it got to VK.
> 
> PSK Bkup is where the primary operation is on the B side but we are  
> also using the TXA for PSK.
> RED = on, GREY = off.
> 
> 
> > Finally, there are references to TXA and TXB. Which is which, in  
> > terms of the frequency. Is TXA on 435.275 MHz and TXB on 437.975MHz?
> 
> Yep, that's correct, both were running this afternoon for a short while
> 
> >
> > 73
> > Peter G3PLX
> >
> >
> 
> Hope that helps
> 
> 73
> 
> 
> Dave
> ----
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> 

 
Mark L. Hammond    [N8MH]
----
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