Glenn Hauser wrote:
I suggest we keep our terminology straight as there are two entirely different
things here:
Something produced by a transmitter and really propagated anywhere but on the
fundamental frequency is a spur:
Correct. Spurious transmission.
Something produced only inside a receiver is an image.
Well, there is intermod(ulation) as defined by an earlier post, the
mixing of various harmonics and frequencies. This usually occurs
entirely within the receiver although rusty or corroded connections
external to the receiver, as stated, can also produce it.
To me, an image is hearing a station that is twice the IF frequency from
where the receiver is tuned. For a receiver with a 455KHz IF, a
station on 1410 would be heard on 500 if the front end of the receiver
dioes not filter it out.
It may be difficult to tell which is which in some cases, like this?
Intermod usually has distorted audio in my experience. Images sound
quite clean.
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