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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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18th Mar 2023, 7:44 pm | #1 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Roberts RM40 AFC problem.
A while back, I acquired a Roberts RM40, and did the usual safety/reliability reworking before loaning it to a friend.
She's now having issues with its AFC; she will tune-in a station with the AFC disabled [which is sensible] but on engaging AFC it will become noisy [like off-tune] and often latch-on to another station potentially two-channels-up from what she wants to hear. Is this a sign of potentially-unbalanced diodes in the discriminator? I've already replaced the big non-intuitively-polarised electrolytic in the discriminator. Where to go next? My friend is really more interested in DX reception on FM [I've already outfitted her with a tunable two-pole filter along with coaxial stubs to notch-out the more-intrusive BBC National noise below 95MHz, and she's got a 5-ele beam at 50-feet, aimed east] Suggestions to help her get good reception of London free-radio stations from her abode in West Berkshire?
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