Steve, The answer to your question involves a discussion about how the K2 handles control of the power output level - in all cases, it tries to measure the actual power output and the microprocessor controls the drive level early in the transmit chain to achieve the power output requested by the power knob.
Just as information about what is happening with that "RF Sensitivity" problem is that *if* some of the VHF/UHF energy appears on the K60XV TX output. That condition causes the RF detector on the K60XV to produce an output on the VRFDET line in the K2 (the detector is not frequency selective - it is just a diode, similar to an RF probe) - the result of all that is the K2 microprocessor ends up receiving a signal telling it that there is too much power at the TX output, and the microprocessor dutifully reduces the power. The simple low pass filter is just as effective at curing that condition as a unity gain buffer stage would be. The ideal solution would be to modify the transverter so that none of its output frequency energy appears on the input cable, but that is not realistic in some situations - it all depends on the transverter. 73, Don W3FPR On 11/8/2011 8:15 AM, Steve Kavanagh wrote: > My apologies regarding the link...as W1RT correctly figured out there should > be an L at the end of it: > > www.qsl.net/ve3sma/downloads.html > > I had seen Don's circuit and decided to go a different route...not having to > dig into the K2 was a plus for me (and I had a good supply of the Omron G5Y > PC-board-mount RF relays). > > I had wondered how W1RT dealt with the RF sensitivity of the transverter out > line....now I know ! I have been thinking lately a better solution than the > filter might be a high isolation buffer amp with 0dB gain (or an attenuator > and then a buffer with gain) built into the K2, but I haven't started looking > to see where there might be room. > > 73, > Steve VE3SMA > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
