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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Probably simple AM radio repair
Hi,
I acquired a Tandy Chronomatic 246 clock radio that is in great condition. The only problem I have is AM reception below 900 kHz is almost non- existant. I can turn up the volume to max and touch the internal antenna to hear stations at low volume. The FM band works great. I did replace a leaking 4.7u electrolytic cap that was nearest to the adjustable yellow choke and tuning cap, but it made no difference. I also adjusted the chokes a little to see if I could get better reception near 900 kHz, but no luck. I'm suspecting there might be a broken wire in the internal AM antenna? The wires in position on the antenna a Red-Black-Blue White If I touch the white wire, much better reception. But it is soldered to the PCB securly. Is there a way to test the antenna, like ohm it out? Any other ideas? Thanks, Dave |
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