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Hi Don,
After I do the AM alignment part of the 2 high bands 88-108 and 27-55, I switch to FM, and there is no sound, because the RF gain control is all the way up,
as I lower the RF gain it begins to howl out of the speaker, then it finally drops into the normal audio hush. My o-scope is in storage, but I am using a frequency counter, and an RCA WR-50b signal generator. The generator output attenuator seems fine, and
cuts off the output on it's lowest setting.
The RF control works the same way with or without the generator running, and sounds terrible on a FM station, overdriven sounding, even with the RF control at its "best sounding position" between 2-3.using the settings as in the alignment setup. On AM the high
bands work, but not well on FM stations. The RF gain control can be advanced to 10 on the 2 top bands in the AM position, and pick up AM signals ok.
When I received the receiver all bands worked, but poorly, I don't remember if FM was proper before the recap, but it barely worked.
The general condition of the receiver is great, with all of the original tubes, which test as new. CW does work, but is turned off. The callibrator works, but is also turned off.
Thanks,
Scott
From:[email protected] <[email protected]> on behalf of don Root <drootofallevil@...>
Sent:?Sunday, March 16, 2025 10:21 PM To:[email protected] <[email protected]> Subject:?Re: [HallicraftersRadios] SX-62 alignment instructions ?
Scott, I’m not too smart and also can’t read between the lines and words.? What is oscillating?, and at what frequency? I guess you see it on a scope unless it is from the BFO and out the speaker.?? ? You mentioned nothing about the history and if you have ever had it receiving or not on any band. ? Will it work on AM/CW on all bands ? ?and it is just the FM detector? On FM what happens with the signal generator off and an antenna ..nothing?, stations? Oscillations most of the time? Is your RG gain pot in good shape, or is it noisy, erratic? ??? I have a sx-62 of some version in sick bay so I am extra curious but it will take a while to understand things. ?
From:[email protected] [mailto:[email protected]]
On Behalf Of Scott Petersen via groups.io ? I did both alignments, and all seemed well until I switched in FM, and the gain was too high, and it wouldn't receive until I turned the RF control to 2-3, and only "works" in a small range, either too high, and oscillates and blanks, or too low a gain to hear anything. ? ._,_ -- don??? va3drl |
