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Author Topic: Muting a BC348N  (Read 1961 times)
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ve6pg
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« on: September 03, 2012, 07:30:28 PM »
how does the mute, or standby in the bc348 work?...i'd like to wire it in to my t/r circuit...
..thanks..
..tim..
..sk..
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...Yes, my name is Tim Smith...sk..
WB6NVH
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« Reply #1 on: September 03, 2012, 09:01:16 PM »
I don't have the schematic in front of me but the muting method is to open the screen B+ feed at the power connector.  Conversions may have screwed this up so you may have to trace it out.  Then also use a T/R switch at the antenna input unless you are using separate antennas.
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Geoff Fors
Monterey, California
K9PNP
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« Reply #2 on: September 03, 2012, 09:54:07 PM »
Mine didn't have the original power connector, but looking at the schematic:

Pins 2 and 6 of the power connector are shorted, normally with a relay.  This applies SG voltage to 2nd RF amp and 1st and 2nd IF amps.

Mine is a 348Q.  the J, N, and Q are about the same; covered in the same manual.  I have the manual in .pdf if you need it.  7.48 MB.
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73,  Mitch

Since 1958. There still is nothing like tubes to keep your coffee warm in the shack.

Vulcan Theory of Troubleshooting:  Once you have eliminated the impossible, whatever remains, however improbable, must be the truth.
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