Garey, thats what I am thinking...it has idle current of about .07
mils...it seems like the bias current you set with the power
supply....It worked fine
until today...I have it apart and checked some voltages and it seems
like its in tune all the time but its not!!! LOL....I am going to check
out the relay tonight..
73
Bill
On 1/30/2012 5:25 PM, Garey Barrell wrote:
Bill -
Sounds almost like it's in SPOT. Possibly a switch anomaly. There
can't be PLATE (Cathode) current on the meter ''normally" unless the
relay is pulled in. Check carefully around the meter terminals, if
one of the terminals is shorting to the chassis?????
So..... Just a guess, but I'd look for a short across the relay
contacts that ground the Cathodes of the PA. The set of contacts has
the 'arm' grounded. When the relay is 'open' it grounds the MUTE line
of the receiver, (enabling the receiver,) and when the relay is
'closed' it grounds the PA Cathodes.
Let us know what you find, or if you get further symptom
information. Like, what is the PLATE meter reading, idle or
operating current.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Bill wrote:
Ok, got a good one....my t4x just started showing cathode current
even when I don't have the key down on the mike or the cw key..its
there all the time and I can hear a carrier on
my r4 all the time...doesn't matter where the controls are
set...seems the finals are in transmit all the time and the relay
isn't pulling in, it only pulls in when I key the mike..I can even
hear my voice in the r4 without the key down...hmmmm.....
73
Bill
Wa2jhs
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