After the Sangean WR-15 received low marks for AM reception in an Amazon review, Bob of Sangean America replied that poor reception is due to the radio’s switching power supply–a design that is federally mandated.
It’s a shame the WR-15 can’t accommodate internal batteries as battery operation this would solve the problem.
If I owned the WR-15, I would simply replace the switching type power supply with a regulated power supply.
Looking at the back of the WR-15 (below), it appears it requires 12 volts DC, 1.2 amps and an adapter with a positive center tip. Though I’m judging this only from the image, the plug looks to be a common size. I bet I have a power supply that would fit the bill in my junk drawer.
Oh, that is a shame. An AM/FM radio with poor AM/FM sensitivity has little appeal (even if it has a great chassis).
John (the reviewer) mentions what sounds like a squelching effect during tuning as well–when a strong signal is received, volume increases with the “lock.” Perhaps a sign this Sangean receiver is powered by a DSP chip and isn’t analog at all?