William Sommerwerck wrote:

"Phil Allison" wrote in message
...
William Sommerwerck wrote:

Given that the FM band is 20MHz, and twice 10.7 MHz is greater than 20MHz,
if
the LO is above the incoming signal, images would come from stations above
107.9MHz (outside the band).

If the LO were below the incoming signal, you could have in-band images
starting at 98.9MHz.

** Nonsense.
Long as a particular band has less width than double the IF frequency,
no in-band images will occur.

Did you actually read what I wrote? The second sentence says that.


** It says NOTHING the sort - ****** boy.



In the third sentence, I said "If the LO were //below// the incoming
signal..."

Do the math: 88.1 minus 10.7 plus 21.4 equals... what? 98.8?

** Garbage.

With the LO at 77.4, the image is at 66.7

The FM broadcast band does not suffer from in-band images long as the IF is 10.7MHz of higher.


.... Phil