[Icom] Filtering at 9 MHz vs. 455 kHz

[Gene A. Williamson]

To each his own:

	As suggested here, the first line of defense is selectivity at 9MHz: there
my IC-756 has a 250Hz filter, followed by a 500Hz at 455kHz. Most of the
time, the 500Hz alone is plenty. For heavy contest action, or a very loud
nearby station pumping the AGC, adding the 250Hz almost always disappears
him like magic. These two filters widen to roughly the same selectivity at
70dB down -- 1KHz -- so the PBT seems OK to me. Factor in sideband-reverse
on CW and the non-ringy APF, and my '756 is a pretty FB CW rig.

	INRAD filters are marvelous ... I used them in my '735s. To my ear, tho,
today's ICOM filters are sharper than those of 10 years ago, and I wanted
to buy the box from Burghardt with everything incorporated in it when it
arrived. YMMV, and I certainly endorse George's fine products.

73 Gene N7YW