[amsat-bb] LVB Tracker oddness

[Norm n3ykf]

Isolatiion shorted (OR OVERVOLTAGE) on COM port?

Ask why a device would not deliberately turn on given a set of conditions.

IF you'd like to spend the afternoon parts swapping, the line driver
is a standard cross.

OTOH, There are a spare line driver pair on the MAX233 chip, unused
and terminated.

This stuff is great fun,  entertaining just long enough to go
"POOFTA". Then things get expensive.

Norm n3ykf

On Sun, Feb 18, 2018 at 8:15 PM, Burns Fisher <burns at fisher.cc> wrote:
> Just had a weird thing happen with my LVB tracker (which has worked fine
> for a couple years now).  I powered on the G5500 and the LVB screen did not
> light up.  After a lot of fiddling, it turns out that if I disconnect the
> RS232 when I turn it on, all is well.  Plug RS232 back in, and it controls
> fine.  I just can't power it up with the computer serial connection hooked
> up.
>
> Any ideas?
>
> 73,
>
> Burns WB1FJ
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