Radio's Internal Power Supply Can Cause Interference

Owl writes:

For many radios etc made by Chinese manufacturers in recent years, the lack of an internatl power supply could in fact be a plus point.

Many bulit-in power supplies, in addition to introducing RF interferences, also make either an annoying hum while on standby, or polute the audio with AC noise (or do both). I have at least 10 such radios (some are $150+ models).

That said, the internal power supply on RP2000/2100 is a rare model that is shielded well and generates almost no noises at all.

Comments

[Tudor]

I never use AC to power my radios. Not only some of the AC/DC converters (internal or external) are noisy, but there is a lot of noise coming from the power lines as well. So I always use batteries, mostly rechargeables.