Graham, You didn’t say which microwave transverter you are using. Perhaps the transverter input requirement can be adjusted to accept the 7W vs 5W. Many of us who drive transverters at reduced levels find that the driving rigs often have full power spikes for just a few milliseconds when keyed, even if the power control has been adjusted down. I don’t know if the K3 does this or not. But my point is, you might be better off adjusting the microwave transverter to accept the full 7 W (or 10W) to avoid the power spike problem.
73, Dave, K4TO > On Jul 6, 2017, at 10:49 AM, Don Wilhelm <donw...@embarqmail.com> wrote: > > Graham, > > You say you have measured the input power to the K144XV and it is a max of > 0dBm and a minimum of -7dBm. If that is incorrect, then my conclusion > (following) is wrong. > > A difference of 7dB should produce 1/20 of the power developed at 0dBm - > based on 10 watts output, you should obtain 0.5 watts output with the -7dBm > input. > > So my conclusion is that the K3 is "doing the right thing", but your K144XV > is not. Perhaps there is some sort of oscillation in the K144XV that is > causing your problem. > > We obviously don't have all the answers here, so I recommend you contact > K3support because they have access to the designers and production test folks > to seek out an answer for you. > > Do you have any way of determining the output frequency on 2 meters? That may > be helpful information for support. > > 73, > Don W3FPR > > On 7/6/2017 10:13 AM, Graham Kimbell wrote: >> * the max output is supposed to be 10W, but measures 7W even after >> calibration - seems wrong but I can cope with this >> * the minimum power is 5W but should be down 10dB on the max, ie >> 0.7W. This is a problem because I need about 1W to drive the >> microwave tvtr. >> * the XV config that allows setting the 28MHz input to the tvtr has >> been checked and is exactly the 1mW (0dBm) default. With the >> power control set to minimum it measured -7dBm. >> So it appears that the internal 2m xvtr has too much gain, and there does >> not appear to be any way to reduce the power output below 5W. Is there any >> chance of making this possible? > ______________________________________________________________ > 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
