Re: [amsat-bb] Any troubleshooters have a suggestion?

[al lawler <alawler@xxxxxxxxxxxxx>]

It almost sounds to me like you're getting RF feedback
into the power supply which is tripping the over-voltage
protection circuitry.

 Try 2 things:

  1)  Run a light-bulb (or some other non-radio load) of 
      the expected wattage and see if the power supply
      behaves.

           If so, then:

  2)  Put a bypass capacitor across the output and/or move
      the radio and antenna further away from the power
      supply.

  -al
  WB1BQE



Jeff Johns wrote:
> 
> This isn't space related, but there is such a wealth of technical knowledge
> available from you guys and gals I hope you pardon by off topic post. For he
> purpose of this discussion, I'm describing a HTX-100 and a Diamond Gold
> Series 12-15 volt 30 amp, Model PS-30G power supply.
> 
> 1) I turn on the power supply and make sure the  voltage on the meter is
>    set properly.
> 
> 2) I turn on the HTX-100 trannsceiver and tune to the frequency I'm going
>    to call CQ via CW on.
> 
> 3) I touch my key
> 
> 4) The voltage needle on the power supply drops to 0 volts and the
>    transceiver dies :(
> 
> It doesn't matter if I'm trying to do CW or use SSB. I can hit the PTT on
> the microphone and the power supply still dies. The supply has worked great
> for the past week when I acquired it (free) and it was working for the
> gentleman (elmer) who gave it to me. When the needle drops to 0 volts the
> transformer continues to hum, so I don't think (I hope) that's the problem.
> I can turn the supply off for about 15-30 seconds and then back on and the
> voltage goes back up but then dies when I try to apply a load to it again
> via the key or PTT button. I don't mind pulling the cover off and peeking
> around and I'm somewhat handy with a meter, but I'm hoping that someone can
> give me some pointers of what to look for and what to check. Does anyone
> have any suggestions? Thanks in advance!
> 
> 73 Jeff W4JEF
> 
>     *=-=-=-=-=-=-=-=-= Jeff Johns W4JEF - AMSAT# 32615 -=-=-=-=-=-=-=-=*
>     |jeffj@scott.net  w4jef@amsat.org |     Reserve Patrol Captain     |
>     |  Satellite: Mir R0MIR-1, AO-27  | Jefferson County Sheriff's Dept|
>     |200LX+BayPac+FT50=Portable Packet|     QTH Birmingham, AL USA     |
>     *=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-*
> 
> 
> 
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