On 24 May 2007 07:28:17 -0700, bpnjensen wrote:

On May 24, 4:01 am, ish wrote:
Hello all,

Why does SW radio comes up with noise the moment I dial beyond AM. I
have tried tuning with several radios (including Sony 2010) and for
some reason noise level seems to increase around that band. I tried
with both AC adapter and plain old battery.

Any ideas?

TIA

I think that this part of the spectrum, due to proximity to and being
a second harmonic of, the AM MW band, is prone to quite a bit of noise
from AM MW sources, both receiver-generated and radio station-
generated. The combination of transmitter splatter, station harmonic
radiation and receiver mixing products gives you a mess to deal with.
Here in the SF Bay area, the bands are about useless for all the junk
that comes in.

David could well be right by suggesting that you cut back on
sensitivity, either using the controls on the radio or using a
"weaker" antenna; however, this area is one where sensitivity is
useful for heairng the weaker stations that inhabit these bands, so
you may just need to choose the cheap method of moving your receiver
to a remote location far from AM transmitters.

Bruce Jensen

I was suggesting perhaps that the front end of the radio has so much
signal in the MWBC band that the AGC was maybe kicking-in and quieting
the radio.