Add an "l" to the url ;) http://www.qsl.net/ve3sma/downloads.html
I used Don's circuit on my low-band K2 (driving one each 50,144,222,432 XV) and an external sequencer in the Jitney .. the last step of the sequencer enables TX in the K2. Steve's solution does it in one board and doesn't require any mods to the K2, and it's relatively easy to isolate 0dBm .. I also use a filter similar to Steve's .. happened to have one of Diz's universal low-pass filters (http://kitsandparts.com/univlpfilter.php) in the kit box and built it up for 10M and that eliminated a number of weird behaviours on TX .. de w1rt/john On Mon, Nov 7, 2011 at 9:34 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > Steve, > > I did not have success with that link you posted - I got a 404 error. > > There is another solution to inhibit CW until a sequencer has completed > and gives a signal back to the K2. It is my article on PTT for CW on my > website www.w3fpr.com. It interrupts the keying unless the "PTT" signal > to the K2 is present (start the sequencer with a footswitch or other > switch external to the K2). > > Yes, the K60XV option does not like VHF RF on the coax connected to the > TX jack - it interferes with the K2 power control. A low pass filter > with a cutoff below 50 MHz (and above 28 MHz) cures that problem A low > power in-line low pass filter works fine. The problem does not exist if > the high power BNC output from the K2 is used. > > 73, > Don W3FPR > > On 11/7/2011 6:17 PM, Steve Kavanagh wrote: >> The K2 makes quite a nice IF rig for VHF transverters, but it has a few >> quirks, like most rigs. I've put my solutions to two issues up at >> www.qsl.net/ve3sma/downloads.htm . >> >> First is a sequencer which switches the RF to the transverter to prevent it >> from transmitting while its internal antenna relay is switching. This deals >> with the lack of any way to stop the K2 from transmitting on CW when the key >> is pressed. >> >> The other is a bandpass filter which gets rid of most of the problems due to >> the high RF sensitivity of the transmit IF output circuitry to RF. >> >> These are not extensive articles, but there should be enough there for >> knowledgeable hams to ccopy...or get ideas for better approaches. >> >> 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 >> > ______________________________________________________________ > 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 > ______________________________________________________________ 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
