[amsat-bb] Re: ARISSat-1 voice telemetry 00:27z 8/21/11

[Anthony Monteiro]

Hi Greg,

That sounds like a great project for a telemetry
"Sherlock!"

73,
Tony AA2TX
---

On 8/23/2011 12:18 AM, Greg D. wrote:
> Ah, interesting.  So, values around +/- 0 mean that the battery is (or
> thinks it is) fully charged, and the satellite is running on just the
> solar panels. Since that happens pretty quickly after start-up (low MET
> values), that certainly supports the conclusion that the battery has
> nearly zero capacity left in it.
>
> But if it's "fully charged", there must be something else going on,
> because I've heard passes where the satellite appears to be in "high
> power" mode - several voice, SSTV, and telemetry segments back-to-back -
> then suddenly turns off after one of the segments. This is where the
> reported battery voltage has remained in the mid- to high-35 volts
> range, consistent with high power operation. Did the satellite happen to
> spin to a less favorable angle for a moment between telemetry readings,
> causing the low power mode threshold to trip?
>
> Playing Armchair Sherlock,
>
> Greg KO6TH
>
>
>  > Date: Mon, 22 Aug 2011 17:41:29 -0400
>  > From: aa2tx at comcast.net
>  > To: ko6th_greg at hotmail.com
>  > CC: amsat-bb at amsat.org
>  > Subject: Re: [amsat-bb] ARISSat-1 voice telemetry 00:27z 8/21/11
>  >
>  > Hi Greg,
>  >
>  > The battery current is not really negative
>  > under these conditions. This is just a small
>  > drift in the zero point of the measurement.
>  >
>  > 73,
>  > Tony AA2TX
>  > ---
>