Re: FT-301 - A repair journey begins
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Dear Mark
to question 1 ?mic 500 ohm. You can find at page 7 instruction manual ft - 301.
att Emerson, PP6EW
Em ter., 30 de jan. de 2024 às 00:52, atlasstuff < g4fph@...> escreveu:
Hi to all in the group!
I have started to repair an FT-301 that I acquired years ago. Must say I am mightily impressed with how Yaesu built these. Just love the plug-in card system - must surely be a candidate for the easiest radio to get into and fix ever made.
So far, I have it working on receive - and sounding nice. On transmit, and without the booster plugged in on the rear panel, it produces up to 20 W of RF in SSB, but only a disappointing 1 W of RF in CW / FSK / AM. Sadly, the booster has suffered some mechanical damage in that the 'Jones' plug has taken a bash and the paxolin on the rear that retains the pins now doesn't. Might end up having to replace the whole plug.
A couple of questions, if I may:
Q1. Should the impedance of the companion hand microphone be 50 kOhm, or 500 Ohm? I thought I had read somewhere that, like the FT-101 up until the E/F, the microphone should be a Hi-Z type. I have both types here, but the 50 kOhm unit does not drive the '301 TX at all, whereas the 500 Ohm one does with gusto.
Q2. The front panel meter on mine is open circuit. The circuit shows it as a 200 uA FSD unit. Does anyone have experience of taking one apart and making a fix, or am I looking at finding a (unobtanium) replacement?
Regards,
Mark, G4FPH.
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