[Test-Equipment] AN/PRM-10 Question

[Brooke Clarke]

Hi Richard:

Is it possible that there's a short somewhere else that's in parallel with the choke?
Did you check with the tube unplugged?
If you have a digital camera try taking some close up photos of the area from different angles an look at them on your 
computer monitor, i.e. use the camera as a microscope.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/


Richard Knoppow wrote:
>       I recently got an AN/PRM-10 Grid Dip Meter, it worked
> OK when it arrived but had an intermittant of some sort. I
> got it to work and then it stopped altogether. The only
> thing I can find is that the cathode to ground resistance of
> the oscillator tube is wrong. This is a small choke going
> from ground to a pin on the tube. The book states this
> should measure 42 ohms in the resistance chart and "about 50
> ohms" in the text but I measure about half an ohm. I can't
> see how this choke could short, it appeas to be a single
> layer solenoid. I wonder if anyone knows for certain what
> its value should be or has an instrument and could measure
> it. I have only the handbooks from BAMA (the dejavu version
> is more complete than the PDF) which do not have a parts
> list to double-check the value. I would very much like to
> get this thing going. The odd part is that it actually
> worked at first but I had to open it to align the tuning cap
> and dial to get the frequency calibration on. I did that and
> after finishing dropped the probe after which it stopped
> working. The acorn tube is good, I tested it and made sure
> it was installed correctly. Any help would be appreciated. I
> can post voltage readings if desired.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
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