24-12-2013, 06:42 PM
(24-12-2013, 03:36 PM)Robert Darwent Wrote: Touching the aerial coils on any portable radio will give a noticeable increase in signal strength as you are effectively using your body as an antenna - it's exactly the same as plugging a wire into the antenna socket.
It does not (necessarily) mean a RF or IF alignment needs performing - you could make things much worse especially if you've never done an alignment before.
Being specific to Laurie's TR82C, it would be very unusual if all the alignment in the set was out - unless of course a "twiddler" has been in there at some time.
Regards
I have found this not always to be the case, in fact, on nearly all the portable sets that I have repaired, if aligned properly, touching the aerial coils will usually result in no discernible difference or a reduction in signal. What I have found though is that if the coils on the ferrite rod appear to be undisturbed, then usually, the set either needs a quick tweak at the high frequency end (with trimmer caps as these are more likely to be twiddler friendly) or the oscillator has been fiddled with and re aligning this will bring the stations back to their proper positions with a resultant increase in signal if nothing else has been disturbed.
I have had several TR82s where a phantom has been at work and realignment has provided a complete cure.
Best Wishes
Rob






