Electronics > Beginners
Pain in the butt: chinese car radio has bad fm reception/mixes channels
epigramx:
It's the one you find for ~$12 when you search car radio in aliexpress (i.e. i.imgur.com/H7sFoD6.png). Impressive for the price, full speaking bluetooth support and all so it can make an ancient car feel better for almost nothing.
But, my dad cares about good reception but this one seems to lose channels relatively easily. It's like it sounds good when it's stationary but when the car moves, every few seconds it hisses/loses reception/mixes channels for 1-2 sec.
Any chance to fix that? It's also a consistent problem with their design, since most people report the exact same behavior (fine on other features, crap at fm radio reception).
snoozer:
Hello,
I am wondering, could that have to do with different requirements of channel spacing (is it called that) ? I have read something about a 200kHz spacing in the US (maybe other countries) and 100kHz spacing in EU or something like that. Maybe there is a hidden function to adjust the radio for different regions.
https://en.wikipedia.org/wiki/FM_broadcast_band
Regards
Jan P.
Audioguru again:
You get what you pay for.
The cheap Chinese FM radio might be a simple "crystal radio" or a horrible "super-regen" design.
A properly designed FM radio has excellent sensitivity but also has automatic gain control to tame very strong signals, and has good selectivity so that it does not mix channels.
Maybe the cheap radio does not have a good signal limiter to properly "capture" the signal, then it has severe interference from multipaths.
amyk:
Open it up and post detailed pictures of the insides. If there are circuit boards, preferably both sides.
radiolistener:
Probably this is because it uses cheap FM receiver, which cannot keep good reception in unstable RF environment.
If it has bluetooth, you can try to connect it with your mobile phone and use FM receiver from your mobile phone.
Just attach antenna into phone jack of your mobile phone:
https://www.aliexpress.com/item/32829125269.html
You can also buy Chinese charger for car, it will helps to avoid discharge of your mobile phone.
https://www.aliexpress.com/item/32875782040.html
If you planning to use your mobile phone as FM receiver, here is also Chinese car phone holder:
https://www.aliexpress.com/item/32616510759.html
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