I second Joel's comments - it is a fun amp to build and operate. I put mine together last year and it has been a nice addition to my station. I drive it with my K3.
Jim / W6JHB On Wednesday, Apr 16, 2014, at Wednesday, 11:28 AM, Joel Hallas wrote: > The problem with most 2 meter "brick" type amplifiers, is that while they > may have an "SSB" switch position, it generally only changes the TR > switching method, and doesn't make them linear. The only medium-power 2 M > amp I found that was linear, while we were testing them for QST was the > Tokyo Hy-Power 300 W amp, that was in a whole different price category from > the bricks, until they discontinued it. > > While transmit linearity may not be a big deal for casual operation, the > consequences of transmit IMD for other folks in busy areas during a VHF > contest (about the only time people around here are on 2 M SSB) can be as > severe as on the HF bands. Since I couldn't seem to generate any interest > from Eric and Wayne in offering a suitable amplifier, I commissioned Jim > Klitzing, W6PQL to come up with a lower power version of his excellent 2 > meter kilowatt that he published in QST. He did, and you can read about it > in: > > May 2013 - QST (Pg. 30) > Build a Linear 2 Meter 80 W All Mode Amplifier > > It can put out 100 W on CW, 80 W on SSB, with HF like IMD. It is fairly > simple because it is based on a single amplifier module, and costs less to > build than a brick. For this application, you can eliminate the automatic > switching circuitry, although it doesn't take much, and then can be used > with your FM handheld. It doesn't include a preamp because the K3 has a > better NF than most preamps. > > It can operate at almost any input level (including that of the KX3 2 meter > mod, I believe) by setting the input attenuator. Because its current drain > is less than the K3 during 100 W transmit, it can be run from the same power > supply, since the K3 HF PA is off when on 2 meters. I have one and have been > very happy with it. I believe Jim offers various parts kits on his website. > > You do have to remember to switch it off when you go to 6 meters, since the > amp quiescent current is high enough when the PTT switches to pop the PS > breaker with 100 W on 6. You learn quickly. > > > Regards, Joel Hallas, W1ZR > Westport, CT > > > Subject: [Elecraft] Suggestions for a 2 meter amp? > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > I installed the internal 2 meter module in my K3 so now I'm in the > market for a good Amplifier to bring it up to at least 100 watts. > > The K3 puts out 10 watts so the amp needs to be 10 Watts input > > Any Suggestions? > > > > ______________________________________________________________ > 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 > Message delivered to [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 Message delivered to [email protected]
