Ed, Your transverter idea sounds like a nice addition to the K3. (Such a transverter could be also used with the KX3. But due to size constraints, of course, the KX3 uses a different synthesizer technology that can't provide 1-Hz stability.)
Wayne N6KR On Feb 5, 2014, at 3:59 PM, Edward R Cole <[email protected]> wrote: > Just to expand a big on what Wayne states: > > Operation on the upcoming (but not yet established by the FCC) new 600 meter > ham band on 472-479 KHz, K3 use is enhanced by this upgrade in the firmware. > It allows operating the K3 on 10.472-10.479 MHz as the IF input to a > transverter which can use a super-stable OCXO or GPS disciplined oscillator > as the 10 MHz LO. Since there will only be 7-Hz spectrum in the whole ham > band only narrow band modes will be allowed. Stations will need to hold +/- > 1-Hz in frequency stability and accuracy to avoid interfering with each other. > > I use a surplus OCXO (Oven Controlled Xtal Oscillator) that I bought on e-bay > for $45. This holds my K3 to 0.01ppm by use of the EXREF and TCXO-3 options. > On 10-MHz band this results in under 1-Hz drift. Using a transverter that > has drift considerably below 1-Hz permits me to use my K3/10 (w/ KVX3) on > this new band. > > I am in early design process to make such a transverter with 25w output and > utilizing a 10-MHz OCXO for LO. At this time I'm considering offering it as > a kit. Only 1mw RF level is needed by the transverter for IF drive. I > expect this is six months off in realizing. It would also be nice if the KX3 > was able to work at 10.472-10.500 MHz. > > 73, Ed - KL7UW > http://www.kl7uw.com/kits.htm > > From: Wayne Burdick <[email protected]> > To: todd ruby <[email protected]> > Cc: Elecraft Reflector Reflector <[email protected]> > Subject: Re: [Elecraft] XVTR IF BAND CAN NOW BE 10 OR 18 MHZ > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > There's no particular benefit to an 18-MHz I.F. But 10 MHz can be useful for > VLF/LF transverters (e.g., 500 kHz) because very high-stability 10-MHz > oscillators (OCO's, or oven-controlled oscillators, etc.) are available at > low cost for use as the mixer injection oscillator. This combined with the > K3's excellent stability can allow the use of extremely narrowband modes that > require very low drift. > > 73, > Wayne > N6KR > > > 73, Ed - KL7UW > http://www.kl7uw.com > "Kits made by KL7UW" > Dubus Mag business: > [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
