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I have a U5-5R, which I've set up to use (among other things) the analog (NFM) frequencies of the PMR446-band. I've been using it with the stock (136-174/400-520MHz) antenna and a monophone connected using the Kenwood-connector. I'm experiencing some pretty severe static/interference using those bands. I'll add that I'm experiencing said static/interference also when I disconnect the monophone. Short video example here.

I've set squelch to the highest level, which didn't help. Other radios (PMR446-dedicated units) did not experience these issues.

I have been using the radio extensively in the VHF-band, and have not experienced any issues there.

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this is not horribly surprising

these units have notoriously awful front end filtering for their intended use (the ham bands).

you didn't really ask a question, but I hope this is helpful

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Baofeng radios are known for having a wide front end, i.e. very low selectivity. This means they’re not able to to concentrate very well on a specific frequency, and instead bring in artefacts of adjacent signals. As far as I know there’s no way to fix this.

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Try getting a Signal Stick from SignalStuff. The stock antennas from Baofeng are bad for both receiving and transmitting. Many people say its a good antenna. Also, its no surprise from a $18 dollar Chinese radio.

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