This is a common problem with single conversion. If your front end is
too sensitive as on some Grundigs, you can overload the IF and get a
mixing product generated at 2 x IF frequency (455kHz) = 910 kHz. This
gives you the image at 910kHz above and below the actual frequency.
This is why more expensive radios are dual and triple conversion.

Jim

On Wed, 31 Dec 2003 19:38:56 GMT, "Frank Dresser"
wrote:


"Richard" wrote in message
...
http://www.home.earthlink.net/%7Esrw...rundig-100.htm


Holy Moly!! Two images on a single conversion radio!!!

I'd ask Major Armstrong what's happening here, but he checked out before
I checked in and my old pal, Fred Terman, has been quite silent over the
last couple of decades, or so.

Is there a mathmetical formula for this image frequency stuff?

Please tell me how this happens, oh wise one!


"By now, we had also acquired a Grundig FR-200 "crank" radio, which has
the typical problems of other single-conversion Grundigs we've tested,
such as the Model 350: noticeable and very irritating images on the
broadcast and SW bands, 910 kHz above or below the proper station
frequency. This means, for example, no less than THREE instances of
"WWV, 10 MHz": one below, one on, and one above the correct frequency.
And stations that are very strong cause hetrodynes when their images
land right on top of one you want to tune in."

Frank "Trailer Park" Dresser