The reason that images are so well attenuated
on your VR-120 is not due to triple conversion,
per se.

The 1st IF is so high, that the image is very far
away (2 * 248.45 MHz) from the operating frequency.
Being this far away, the tuned circuits in the scanner's
front end attenuate the image.

Consider trying a different antenna.
The stock VR-120 antenna has a performance notch
near 159 MHz.
It may also have a notch at 477 MHz, which is 3 times 159 MHz
and that accounts for the problem you described near 477 MHz.

On Tue, 29 Jul 2003 22:13:00 +0000, Bruce Markowitz wrote:
Got a question about the Yaesu VR-120.
It seems somewhat deaf on a few 477 Mhz freqs
I would like to try using the IF images (On some older Bearcats, like
my 200XLT, I use 498.9125 for 477.2125 due to intermod on the "real"
freq)
The IF's on this radio are 248.45 MHz, 15 MHZ, 450Khz according to the
manual.
BUT, I can't hear anything by either adding or subtracting the above
IF's to 477.2125
Is there something I am doing wrong, or does a triple conversion
receiver not work that way?
Any help appreciated!!!!

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Bob Parnass, AJ9S GNU/Linux User http://parnass.com