Wayne N6KR mentioned the following in a discussion about cable length between a K2/(100) and a remoted KAT-100
"2. If you're using a KPA100 in your K2, and you do find that power readings are unstable with the long KAT100 control cable, you can disconnect the "VRFDET" wire at both ends of the control cable. This is because the KPA100 itself provides the VRFDET signal to the K2, not the KAT100. If you have no KPA100, though, you'll have to keep the VRFDET line connected, since the KAT100 supplies the VRFDET signal in this case. But of course power levels are much lower without the KAT100, and chances are there would be no RFI problem." My KAT-100 is attached permanantly to the bottom of my K2/100 and the control lines fed directly between the top and bottom units. Don W3FPR and I were discussing shielding the ribbon cable between the two units to discourage any RF voltage appearing on the vRFdet line but perhaps Wayne has pointed to the easy fix. Two questions: 1) Since vRFdet is fed from my internal KPA-100 Wayne says the vRFdet line from the KAT-100 can be left unwired correct? This would reduce any chance of stray RF pickup on that line. 2) If the above it true...in theory....I would not even need U6 (EL5146C) in the circuit of the KAT-100. Mine failed and was pulling down the vRFdet line in the K2. I'm going to install a socket at U6 in either case, populated or not. I was not aware that it is not used when running with a KPA-100. As a reminder of what is physically going on with my K2/100/AT. This is how I've been running my K2/100/KAT-100 for the past year: http://www.k2ta.com/k2plus1_2d.jpg http://www.k2ta.com/k2plus1_back.jpg http://www.k2ta.com/k2plus1_back2.jpg http://www.k2ta.com/k2plus1_front1.jpg http://www.k2ta.com/k2plus1_front2.jpg http://www.k2ta.com/k2plus1_knotch.jpg http://www.k2ta.com/k2plus1_leftside.jpg http://www.k2ta.com/k2plus1_screw.jpg http://www.k2ta.com/k2plus1_side1.jpg Tom K2TA K2/100 #1117 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
