Dear Drake list members,
I'm a bit new to Drake radios, and recently purchased a B-line, with an AC-3...after reading the scary stories about bias supply failures, I decided to recap the power supply prior to powering up the transmitter... before recapping I did a little looking...I found some mods on the AC-3 (three of them, what I think are mods)......was hoping someone could explain them... On the rear apron, there's (1), a female RCA jack on the apron labeled "agc" and (2), a two pin female jack labeled "antivox". Also, there's (3) a second (extra) cable coming out of a gromet lined hole (the hole was drilled right under the "n" of "caution") and this cable is rather expertly tied to the main cable and goes into the Cinch/Jones female plug. Both the added female jacks go to the extra cable. Curiously, the extra cable has but one wire actually attached to the internal wiring of the power supply...and that one wire goes to a ground lug. The "anti-vox" goes to pins 5 and 8 in the Cinch/Jones plug...The "agc" goes to pin 3. Pins 3,5 and 8 are the only unused pins in the plug Oh, yes. There's another, separate, cable: It has a two pin male (which appears to fit the "anti vox" female" with a female RCA on it...it's about 14" long. When examining the schematic for the AC-3, none of the above appears on the schematic. When looking in the transmitter manual, none of these connections or cables show up in the connection diagrams between the receiver, transmitter, and AC-3. It appears, on the surface, the previous owner wanted both anti-vox and agc outputs on the back of the AC-3...but why? Any ideas?
Thanks, Guy, WA6OQQ.
