Guys come on, notice I've been operating the amp for a while with multiple rigs.. Clearly that's not the problem, I'm suspecting a diode.. But we'll see.
De WA6HYQ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Garey Barrell Sent: Wednesday, August 18, 2010 12:00 PM To: [email protected] Subject: Re: [Drakelist] L4B KEYING CIRCUIT FAILURE Evan - Good point! I assume too much.... 73, Garey - K4OAH Glen Allen, VA K9sqg wrote: > > John, > > For the VOX connector/circuit to work, the ALC pot switch must be in > the out position. > > > > > -----Original Message----- > From: John Hudson <[email protected]> > To: [email protected] <[email protected]> > Sent: Wed, Aug 18, 2010 2:26 pm > Subject: [Drakelist] L4B KEYING CIRCUIT FAILURE > > A simple question (as if there really are any) about the Keying > circuit of an L4B. Because I use several radios to drive the L4B I > have a 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 there could be voltage on the VOX pins and > it’s actually referenced in the manual that if you have the pins > reversed the plate current will go up and to reverse the pins. There > is no voltage present! > · Saying all that, what voltage should I see if any on the keying > circuit when not keyed? > · Has anyone experienced this before and if so what did you find? > Yes, before anyone says it, I know ultimately I have pull the unit out > of line and take it apart to trouble shoot but I also know symptoms > can 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 [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
