[Drakelist] TR-4C frequency instability
What factors could contribute to frequency instability EXTERNAL to the PTO? My TR-4C has just developed a "jittery" frequency, jumping back and forth around center freq by as much as 50Hz. I know someone (if not many) will refer me to the excellent articles on PTO rebuilds, but before someone does, let me say that I have rebuilt my internal PTO last year and it has been working flawlessly since then. I believe this is external to the PTO because I am seeing the same instability on both the internal PTO (rebuilt last year as stated previously) and also on the RV-4C PTO (factory original, but has always been stable, other than a heat induced drift issue mentioned in another thread). Is this a Oscillator tube going bad, or some other component in the freq. chain? Thanks, Loren - WA3WZR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR-4C issues
just FYI, I took the TR-4C back to my work bench and looked it over again out of the case. Saw nothing, then I tried it on my spare AC4 (both AC4s have been rebuilt btw) and found no issues, took it back to the shack and tried it again and now all is functioning again. Have no idea. Still interested in a source for a replacement RFC13. Loren - WA3WZR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] Drake "C" Line for sale --
Hi to the group -- I have a very nice Drake "C" line that I need to sell, as it has become excess to my needs. It does have one minor issue and that is that the R4C cabinet is not original. It was lost somewhere in transition and I have not been able to find it. So, I modified a TR4C cabinet to put on it. Needs paint but it is functional. And to be truthful, one can't really tell much once the radio is in place. LOL! Anyway, here is what I have -- T4Xc, full output and in good shape. AC4 R4C, Has the Noise Blanker installed, with additional crystals - 18.0, 21.10, 39.1, 12.60, 21.10 MS-4 W4 All for $700.00 + Shipping, by way of FEDEX Thanks -- Rick NU7Z ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
