[amsat-bb] Re: SDX works

Anthony Monteiro aa2tx at comcast.net
Thu Aug 4 10:12:56 PDT 2011

Hi Phil,

The transponder is on in low-power mode while the
telemetry beacon is on. You only get 30-40 seconds
at a time but if you are quick, you should be able
to make a short contact.

The BPSK seems to be working very well - Thank you for
all your work!

Tony AA2TX
On 8/4/2011 2:27 AM, Phil Karn wrote:
> On 8/3/11 9:28 PM, Andrew Glasbrenner wrote:
>> I was able to hear myself with as little as 1 watt on the 0425Z pass.
>> Antennas are a M2 CP42 on RHCP up, and a 10 element horizontal yagi
>> down. Sounded VERY good, and cycled on and off with the telemetry. I
>> also managed to grab 2 frames of tlm right after AOS. I have a wav file
>> of the transponder test.
> Now *THIS* is the best news I've heard all day since the deployment and
> initial reception reports!!
> Perhaps the transponder is disabled in low-power mode during night passes?
> Remember this spacecraft is carrying a silver-zinc battery. While
> nominally rechargeable, this type of battery has a very short cycle life
> usually specified in the single digits. This is the reason for the
> conservatism in eclipse operation. Without that battery, the computer
> will regularly reset in eclipse and the spacecraft won't behave nearly
> as well as we'd like.
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