RE: [amsat-bb] Be prepared for the worse + ao-40 BATT

["Luc Leblanc (VE2DWE)" <luclebla@xxxxxxxxxxxxxxxxx>]

Just to pointed out i was refering to 1296MHZ for moon bounce eg: former  AO-40 L-banders have immediate TX-
RX capabilities on many transverters.

Batteries VS regulators on AO-40.

Following an extensive phone discussion last thursday with an AO-40 newbie. We try to figure out how much 
power BCR'S  can dissipate when charging in the present batteries configuration? Taking in account the main 
one with failing cell (s) and AUX in a deep discharge condition. Is the current flow needed in thoses 
conditions can exceed BCR capacities? knowing without BCR it will be nearly impossible to recover any 
batteries. 

Excerpt from Peter Guelzow post.

"For example, you could use a normal relay which is simply powered from the Bus and disconnects
the battery when the Bus voltage drops under a certain extreme low level, which normally never occurs.. even 
under high load. The BCR can run without battery, thus the satellite would work when not in eclipse."

To concluded how much beating BCR can handle before blowing up?

Excerpt from i8CVS Domenico and  DJ7AL Rolf

"The temperature sensor of heatpipe 4+X+Y suddently increased from 
27 to 92 centigrade and voltage dropped from 26 to 14 volts during the
same time."

The heat sensors on columbia left wiing also reported anormal values and sensors malfunction was the first 
intrerpretation given. But we all know sensors where right.

An automatic BCR to solar panel automatic switching system is something engeneer does not evaluate essential 
on the first construction steps!..." when the Bus voltage drops under a certain extreme low level "




Luc Leblanc VE2DWE
Coordonnateur AMSAT pour le Québec
Quebec AMSAT coordinator
AMSAT MEMBER (33583)
Sites web sites: www.qsl.net/ve2dwe
                          www.sorel-tracy.qc.ca/~luclebla/

Echolink node 115340 VE2DWE-L
Echolink node 101810 VE2DWE

P.O. Box 341
Sorel-Tracy  QC.
Canada
J3P 5T6

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