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It actually varies by unit. They quality control is not consistent across the runs. I've actually got one that puts out nearly 2 dBm on a spur…which is right on top of one of the control channels of the local PS safety system when transmitting on a commonly used UHF frequency. I've got another that is just fine though.
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Ok, so let's look at this scientifically.
Are they both the same model number, firmware version, and production run?
There are something like 15 or more different variants of the UV-5R, for example. They all use pretty much identical hardware inside the case. Here is a list (though it is not comprehensive, I see a couple of models missing right off the bat). There are even some manufactured for other labels.
UV-5R variants
Within these variants, there are presumably some minor hardware differences besides the cosmetic case differences (things like the LCD screen, for example, some are "negative" displays). There are many firmware differences, etc.
The point I am making is that with all of the different Baofeng radios available, it is hard to say that the whole brand is "bad" based on anecdotal evidence like this. If we could identify the offending model/firmware/production runs we could make a more accurate statement than "Some work fine, some don't, so avoid them all". I'd much rather see something like "17% of the BF-F9HP models emit spurious signals based on our testing of XXX number of units in these controlled, laboratory conditions." That's the kind of statement that has value to a budget-minded amateur shopping for radios.
It's like condemning an entire car brand because some examples of one model year had problems.