John,
For the VOX connector/circuit to work, the ALC pot switch must be in the out position. How much voltage is on the pins is based upon whether it is a stock linear or if it has had one of the circuit boards added to allow it to be compatible with solid state rigs. The voltage on the hot pin should either be a volt or two, or 30 volts or so depending on the specific amp. Unmodified amps should have between 25 and 30 volts on one vox pin, the other pin is grounded. 73, Evan, K9SQG -----Original Message----- From: John Hudson <john.hud...@calema.ca.gov> To: drakel...@.zerobeat.net <drakelist@zerobeat.net> Sent: Wed, Aug 18, 2010 2:26 pm Subject: [Drakelist] L4B KEYING CIRCUIT FAILURE A simple question (as if there really are any) about theKeying circuit of an L4B. Because I use several radios to drive the L4B I havea relay connected to the amplifier keying circuit that really only grounds the leads,that has now failed to work. I looked at the schematic and it appears therecould be voltage on the VOX pins and it’s actually referenced in the manualthat if you have the pins reversed the plate current will go up and to reversethe pins. There is no voltage present! · Saying all that, what voltage should I see ifany on the keying circuit when not keyed? · Has anyone experienced this before and if sowhat did you find? Yes, before anyone says it, I know ultimately I have pullthe unit out of line and take it apart to trouble shoot but I also know symptomscan provide a path to repair and a place to start. Thank you (in advance), John N.Hudson III, WA6HYQ “C”line, TR4C, RV4C, L4B, MN-2000, TR-6 Owner-Operator. _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
