RadioBanter - View Single Post - Problem with. Astron RS-50M Power Supply

July 11th 03, 05:51 AM

wrote:

With the gear hooked to the supply, even with it turned-off, when I
turn on the supply, the voltage transient cleans or erases the
programming in the radios. It's not the radio, as it does it with 2-3
different ones.

Does anyone have any idea how to solve this problem, or if a faulty
component might be causing it?

I've worked on more than few of these supplies, and have never seen
this problem before.

I've E-mailed Astron, and did not even reply.
WB0VQP

First, verify the problem. To do that, connect a switch
between the Astron and the equipment. Turn the supply on,
wait one minute, then turn the switch on. If you still have
the problem, it's not in the supply. If it eliminates the
problem, you could try adding an automotive relay in place
of the switch. Energize the relay from the 13.8 volts -
it will give you roughly 8 milliseconds delay between the
time you switch the Astron on and the time power is available
to the equipment. That doesn't fix the transient problem, but
it does bypass it. Another solution that doesn't fix the
problem (at its source, assuming it is a supply generated
transient) but does bypass it is a transorb diode rated at
15 volts, connected across the supply 13.8 v DC.

If the supply is creating transients causing the problem,
and you want to fix it at the source, you could try bypassing
things to ground with a bunch of .01 caps.

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