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RE: AO-16. Is the sent telemetry correct?



One normally prays that at the output of a voltage
regulator chain, intended to deliver 10V, that it is
somewhere near 10V.

Bob


-----Original Message-----
From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org]On
Behalf Of Jim White
Sent: Friday, January 25, 2002 8:23 PM
To: Miguel A. Menéndez
Cc: amsat-bb@amsat.org
Subject: Re: [amsat-bb] AO-16. Is the sent telemetry correct?


Miguel,
The 10V bus voltage measurement in the BCR (channel 0x10) never has been
equal to the sum of the battery voltages.  The 10V measurement in the
receiver has generally been closer to the sum of the batteries and is the
one we consider more accurate.  Additionally one of the battery voltages
has always been suspect, if I remember it was bat 6.  We believe these
differences were due to small calibration errors that add up when you sum
the battery voltages.

However, it's entirely possibly that some measurements have gone
bad.  These birds are almost exactly 12 years old now.

Jim
jim@coloradosatellite.com

At 11:53 PM 01/25/2002 +0100, Miguel A. Menéndez wrote:
>Hello
>It seems that the telemetry of the PACSAT is deteriorating.
>Is the sent telemetry correct?
>For the received observations, the channel H' 010 / +10V Bus, it is fixed,
>it doesn't reflect the sum of the batteries voltages.
>
>==================
>
>uptime is 712/18:17:31.  Time is Fri Jan 25 22:00:37 2002
>+10V Bus        10.400 V  +Z Array Temp   -0.002 D
>+X (RX) Temp     4.839 D  RX Temp         15.731 D
>Bat 1 V          1.248 V  Bat 2 V          1.238 V
>Bat 3 V          1.245 V  Bat 4 V          1.264 V
>Bat 5 V          1.263 V  Bat 6 V          1.254 V
>Bat 7 V          1.249 V  Bat 8 V          1.272 V
>Bat 1 Temp      10.890 D  Bat 2 Temp      10.285 D
>Baseplt Temp    10.285 D  PSK TX RF Out    1.607 W
>+Y Array Temp  -11.499 D  PSK TX HPA Tmp   7.260 D
>
>
>73 de Miguel, EA1BCU
>
>=================================================
>   Miguel A. Menéndez  // Apdo. 79  Avilés // 33400 ASTURIAS Spain.
>    E-mail: ea1bcu@amsat.org     www.telecable.es/personales/ea1bcu
>=================================================
>
>
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