H. M. Motley Jr. wrote:
> I have developed an intermittent problem. At times my Paragon with neither
> TX or RX on 18 and 15M or at other times 12 and 10 M. From looking at the
> circuit diagram it appears the trouble must be in the low pass filter board
> where the appropriate LPF is selected by relays which are energized by the
> "T" voltage which is applied to the proper control line. I notice the two
> relays for each LPF are wired in series. When the trouble occurs I hear a
> relay kick in and later I hear a relay stuttering. Finally it may engage and
> things work properly. I notice all control lines are buffered by relay
> driver U1. Has anyone had this problem and solved it? Was it U1 or the
> relays? I never have this problem on the lower bands. Perhaps I should
> replace all 4 relays for these two LPF's? OR maybe there is some other
> problem? Any suggestions would be appreciated.
>
>
when you hear relay chatter, it is usually due to pitted contact
surface, sometimes, with good polishing cloth, I clean them. Best
solution is to replace them.
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