[Johnson] Johnson 500 Meter Shunt

[Rodger]

Harry and list,

The shunts in most Johnson transmitters are just a piece of nichrome
resistance wire, usually 1/4 inch long or less and not insulated.  It will
not look like a regular resistor but just a piece of bare wire, in
construction Johnson cut (or had the builder cut in home constructed units)
a certain length and solder it in place.  This is one of the reasons Johnson
shunts are so far off in many units.  I replace them with "real" precision
resistors from Mouser.

73, Rodger WQ9E

> -----Original Message-----
> From: johnson-bounces at mailman.qth.net [mailto:johnson-
> bounces at mailman.qth.net] On Behalf Of Harry Williams
> Sent: Saturday, January 20, 2007 3:17 PM
> To: johnson
> Subject: [Johnson] Johnson 500 Meter Shunt
> 
> I am trying to physically locate the meter shunt resistor for the mod
> cathode current, R169. I have spent an hour trying to find it and can not.
> The schematic shows that it is located on the RF exciter deck. I have
> followed the circuit from pin 7 on the plug on the back of the deck to the
> meter switch and no resistor. Anyone no where it's located? My
> measurements show that it is open...maybe because it doesn't exist....
> 
> Thanks,
> Harry
> W0PIY
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