[Milsurplus] RF ammeters

[Jim Whartenby]

Most likely a thermocouple type ammeter in which the RF current heats a 
wire which has a thermocouple in close physical contact.  You then have two 
isolated circuits.  One carries the RF current and the other a voltage in 
proportion to the RF current.  Either the thermocouple itself or the meter coil 
is open.  




----- Original Message ----
From: Laura and Jim <mcenfalz at humboldt1.com>
To: milsurplus at mailman.qth.net
Sent: Tue, September 21, 2010 1:13:18 AM
Subject: [Milsurplus] RF ammeters

Jogged my memory: I have a blown one in my BC-375. I get full output (55W 
'phone) per my outboard watt/SWR meter but the needle is dead. Meter shows 
continuity. Were these designed to short when they blew so you weren't SOL? 
Schematic shows it in series w/the antenna output and no apparent bypass.

Cheers!

Jim Falls
K6FWT
Eureka, CA
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