Hi Buck, While the RF gain control results in digital advice being sent to the K3's CPU, it is not an encoder like some other controls on the front panel. This will not be a firmware issue.
The RF and AF gain controls are dual potentiometers. A standard voltage is placed across the pot (the two ends of the resistance stripe) and the wiper voltage is connected to an analog-to-digital converter. The digital output is sent over a multiplexed digital line to the CPU. The trouble you quote is not likely to go away, because it probably occurs from a cracked resistance stripe and/or a bent wiper, usually caused by a blow to the potentiometer knob(s). You will need to replace the pot, or have it replaced by Elecraft. This is not one of those eensy-teensy, fly-spec SMT repairs, you can actually see everything without a magnifying glass. Most people handy at soldering small electronic parts can do this repair, though it does involve a lot of disassembly to remove the forward board from the case front panel to expose everything. Contact Elecraft for a how-to conversation, a decision, and a replacement component or an RMA to repair. 73, Guy K2AV On Thu, Jul 2, 2015 at 2:06 PM, K4ia via Elecraft <[email protected]> wrote: > The RF Gain control on the Sub RX acts weird. It will seem deaf until 3 > o'clock on the dial. Once past 3, the gain jumps up and then is linear if > you turn it down. This pattern will repeat if you turn off the Sub Rx and > turn it back on again. The main RX Rf Gain control is smooth and linear > all through the dial range. I have done the RX calibration routine on > both receivers. > > During Field Day, if I hit the Esc Key or the paddle to interrupt a CQ > (N1MM+) , my external keyer (MKUSB) would stop keying but the rig would > stay in transmit mode. Tapping the XMT button would put the rig back to RX > mode. > > Ideas? > > -- > Buck > k4ia K3 #101 > Honor Roll 333 > 8B DXCC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
