Frequency drift comes to mind. The HF ATU probably won’t do anything for VHF.
Let the radio warm up for half an hour before doing anything with VHF. Remember 1PPM at VHF is 144 Hertz. You need the high def oscillator and maybe the Ref In. Sent from my iPhone ...nr4c. bill > On May 23, 2019, at 1:05 PM, Hank <[email protected]> wrote: > > > Hey Folks... > > I have noticed 2 unusual issues with my recently installed K144XV. I bought > it used from a list member and installed it a few months ago. It seems to > work ok but after some extended use (which recently begun) it is does 2 > things: after it has been in use (even just monitoring) for local FM repeater > work, the S-Meter on the K3S starts to read lower and lower (by as much as 3 > S-Units) for the same repeater signal; and 2 - the audio becomes a little > distorted on stronger signals (the ATT makes no difference in the audio > distortion). > > The audio happens almost immediately after turning up the rig, but the signal > "weakening" takes 10 to 15 minutes of the transverter being active (active > band on K3S). It will occur faster it is being used (transmitting). I have > it set to very low power (display reads -6db), and it will still show > "weakening" on the S-Meter during reception after using it. I noticed it > fist doing some longer packet transmissions, but it will also happen after a > period of time of just listening. > > The audio distortion is not as noticeable on signals below S-9, but listening > in headphones will reveal the distortion is still there. > > > The K3S currently has the standard TXCO installed and no reference lock on > the K144XV. The 13khz filter is installed in the main receiver. I have no > external reference board installed in the K3S. I have ordered the higher > stability TXCO for the K3S and the K144XV reference lock, but have not > received them yet from Elecraft. > > > The audio on HF is OK and the S-Meter does not seem to "weaken" in a similar > fashion when monitoring strong net signals over time. > > > Any ideas? > > Hank > K4HYJ > K3S, P3, KX3 > > > > > > > > ______________________________________________________________ > 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
