While setting up a transverter for PTT over the coax line with a bias-T ckt, I encountered a surprise when I connected the transverter to the Rx connection of the KXV3. The line went low every time I connected it to the K3. I measured 75-ohms resistance across the Rx BNC on the KXV3! I would have expected it to be capacitively coupled and show infinite resistance.
It is not a problem as a custom interface is being built to key the transverter PTT thru a bias-T interface. The interface incorporates dc blocking capacitors to the K3 on both Tx and Rx coax lines. The customer wants a single coax line between the K3 and the transverter, thus PTT over the shared coax line (I suspect the transverter is to be placed remotely from the radio and run on a separate dc power source). 73, Ed - KL7UW, WD2XSH/45 ====================================== BP40IQ 500 KHz - 10-GHz www.kl7uw.com EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-? DUBUS Magazine USA Rep dubus...@gmail.com "Kits made by KL7UW" http://www.kl7uw.com/kits.htm ====================================== ______________________________________________________________ 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
