A bad coax jumper or a loose coax connector can cause problems like this, especially if it is in between the radio and the external SWR meter. Can you try a different coax jumper? Or, can you bypass the external SWR meter and connect the antenna directly to the K3, perhaps ANT 2 instead of ANT 1? If no difference, I suppose something could be wrong with the low pass filters inside the K3, but check the coax first.
73, Bob, N6TV On Sun, Mar 3, 2019 at 4:40 AM Ilya <[email protected]> wrote: > Hi Gentlemen! > > Recently I got some strange behaviour in my K3/100 #4413, looking for any > ideas. > > When running more than 12 watts on 3.5 and especially 1.8 mhz, the internal > meter shows higher SWR values. The higher the power is set - the higher the > showings are. Like when the power is 20w - it shows smth near 2.0, when the > power is set to 50w - it shows 3.0 and says 'HI SWR'. If I tune antenna > with ATU prior to transmitting - the values are lower, but overall > behaviour is reproduced. Everything looks fine on 40 meters and higher. > > But: > 1. External meter shows normal SWR like 1.2-1.5 (the real one - the same as > my antenna analyzer shows). > 2. If power level is set lower than 11.9 watts - the problem does not > persist (internal meter shows 1 or 2 segments). > > Given the description above - I guess something should be wrong in the 100w > amplifier? > Looking for any advice. > > Thanks and 73! > Ilya, R3XA > ______________________________________________________________ > 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
