OK, Dave. Yes, I am somewhat familiar with DEMI's predecessor of the K60XV. It had no Elecraft-style power control, so it wouldn't surprise me if the power fell off with frequency above 29 MHz. I guess I should test the 29+ MHz output level of the K60XV in the K2 I have with one installed.
Thanks for your info. 73, Steve VE3SMA -------------------------------------------- On Sat, 5/19/18, Dave Sublette <k4to.d...@gmail.com> wrote: Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz To: "Steve Kavanagh" <skavanag...@yahoo.ca> Received: Saturday, May 19, 2018, 4:54 PM Well now -- I don't think I was using the K60XV. When Steve Kostro developed the DEMI board, it just was wired into some point on the output chain. He changed the ON/OFF Power switch on the back to select either the HF QRP signal or the output of the transverter board at the BNC connector. The output of the transverter was about 22 dBm or 220 mw. Dave On Sat, May 19, 2018 at 3:39 PM Steve Kavanagh <skavanag...@yahoo.ca> wrote: Thanks, Dave. Were you using a K60XV transverter interface or the QRP antenna jack for transmit output (and if the latter, at what power level) ? 73, Steve VE3SMA -------------------------------------------- On Sat, 5/19/18, Dave Sublette <k4to.d...@gmail.com> wrote: Subject: Re: [Elecraft] [K2] Using the K2 above 29 MHz To: "Steve Kavanagh" <skavanag...@yahoo.ca> Cc: "Elecraft Discussion List" <elecraft@mailman.qth.net> Received: Saturday, May 19, 2018, 2:12 PM I have used my K2 with a DEMI 2M transverter board in it to drive transverters from 902 through 10368 MHz for many years. When I used it to drive both 902 and 903 MHz portions of that band, the output was very much lower when 29MHz was in use for 903. I can't say whether it was due to the 29 MHz IF or the 144MHz transverter output. I didn't pay much attention to spurs as 902/903 is a trashy band anyway. I have made many nice QSOs with the setup. 73, Dave, K4TO On Sat, May 19, 2018 at 1:18 PM Steve Kavanagh via Elecraft <elecraft@mailman.qth.net> wrote: The K2 is specified to operate on 10m only up to 28.8 MHz. While contemplating possible future VHF rigs for a multi-operator multi-band environment, I have wondered about using a K2 as an IF for VHF transverters at around 29-29.4 MHz (to avoid interference with bands using 28 MHz IF). Both of my K2s seem to operate (VFO synthesizer works) up to 30 MHz. At 29.5 MHz the available transmit power (QRP) is starting to drop off and this is quite noticeable at 30 MHz. The QRP PA efficiency drops off somewhat as well. There are a few receive birdies on the 100 watt radio, but the QRP one is pretty quiet - nothing that should be noticeable under the extra noise coming from a transverter. Turning the preamp on makes extra noise as it should (but it is after the bandpass filters so that doesn't mean a whole lot). But it seems that it should work ok as long as I don't want more than 4-5 watts (most likely I'd use a K60XV), perhaps with a bit of bandpass filter tweaking. Are there any caveats that I am unaware of? Spurious emissions, perhaps? Has anyone tried using their K2 above 29 MHz? 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 Message delivered to k...@arrl.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
