Electronics > Beginners

Pain in the butt: chinese car radio has bad fm reception/mixes channels

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vk6zgo:

--- Quote from: janoc on August 22, 2019, 06:15:57 pm ---
--- Quote from: Audioguru again on August 19, 2019, 02:00:31 pm ---You get what you pay for.
The cheap Chinese FM radio might be a simple "crystal radio" or a horrible "super-regen" design.

--- End quote ---

Umm, for FM? I don't think so ...

More likely than not it is using a cheap FM radio IC and/or poor antenna connection. The constant signal dropouts certainly point to the issues with the antenna. Either the connection is bad or the device is poorly engineered and has very poor sensitivity (assuming there is a decent FM signal nearby, of course - i.e. don't test this somewhere in an underground garage!).

--- End quote ---

Yeah, it is not uncommon to use a very inefficient antenna with an amplifier at its base, the power to the amplifier being fed through the coax.

My daughter's old Daewoo had this setup, & the connection was brought up through the rear tailgate for some unknown reason, with a section which had to flex, losing the shield after a while, so the amp was "dead".(they didn't leave any slack so you could fix it, either).

The "antenna" now consisted of just the piece of coax, which, strangely enough worked OK "sometimes"!

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