[amsat-bb] Re: AO-51 adjustments

[Andrew Glasbrenner]

TXa refers to the 435.150 downlink, and TXb to 435.300, regardless of the 
uplink or configuration. The power levels should be roughly the same for 
Field Day.

73, Drew KO4MA

----- Original Message ----- 
From: <n3tl at bellsouth.net>
To: "Gould Smith" <gouldsmi at bellsouth.net>; <amsat-bb at amsat.org>
Sent: Monday, June 22, 2009 10:40 AM
Subject: [amsat-bb] Re: AO-51 adjustments


> Thanks for the information Gould.
>
> Will you clarify, please, that TXA is the normal U/V configuration - and 
> also that these are the power levels we can expect for Field Day? That's 
> what I understand from your comments.
>
> Thank you, and thanks for all your efforts to keep AO-51 functioning as 
> best as it can given the issues you have to address.
>
> 73 to all,
>
> Tim - N3TL
> -------------- Original message from "Gould Smith" 
> <gouldsmi at bellsouth.net>: -------------- 
>
> I am working with the satellite to get the Field Day configuration 
> operational
>> long term.. I turned TXB back on during the 1300Z pass.
>> During this pass I adjusted the TX levels to TXA 240 mW and TXB 290 mW. 
>> These are lower power levels than I have ever used before, but necessary 
>> to get the satellite through the 16+ minute eclipses each orbit. The SQRX 
>> receiver uses
>> about 110 mA that must be subtracted from the total TX power used.
>> I think I am close and expect to get the correct settings over the next 
>> 24 hours. It is also necessary to change the L/U analog operation to 
>> digital over the eastern US in order to download the telemetry to see how 
>> the satellite is
>> performing over multiple orbits.
>>
>> 73,
>> Gould, WA4SXM
>> AO-51 Command Station
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