[Johnson] Johnson 500 Meter Shunt

[Craig C. Heaton]

Harry,

There isn't a shunt resistor for the PA cathode current! Do a parts count in
the parts list, four of the shunts for the other meter are on page 59 and
the last one is on page 60. (R126, R134, R143, R139 and R169) they are all
5% 1/2 watt wire wound. Also note the value for the PA cathode current meter
itself, its a 0-500 MA DC meter.

73's
Craig,

-----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 1:17 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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