[ICOM] Multiple mode filters in 756

[Adam Farson]

Hi John,

Dare I suggest it? Have you considered upgrading to an IC-756Pro2 or Pro3?
The Pro2 is quite well priced in the second-hand market at present.

You will find the Twin PBT very sloppy if you mix the FL-223 (1.9 kHz at 9
MHz) and a 400 Hz CW filter at 455 kHz. If you work mostly SSB, you will be
better off with the FL-223 and the FL-222 (455 kHz, 1.8 kHz BW). The Twin
PBT will be excellent for SSB, and you can always narrow the passband for CW
by rotating the Twin PBT controls. Admittedly, the skirt selectivity will
not be as good as if you had a 400 Hz filter installed.

http://www.qsl.net/icom/xfilter.html 

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of John Geiger
Sent: 27 August 2005 23:06
To: ICOM Reflector; ic756 at yahoogroups.com
Subject: [ICOM] Multiple mode filters in 756

I have an Icom 756 original and currently have the FL100 500hz CW filter
installed. However, it would be nice to have a slightly narrower filter for
SSB work also, and in the 756 you can only install 1 filter at each IF.  I
realize that I would lose the ability to cascade filters, but am wondering
if anyone has tried using a 1.9khz SSB filter at the 1 IF and a narrow CW
filter at the other IF.  I also realize that the passband tuning wouldn't
work as well when the filters were engaged, but should be fine without the
filters engaged.  I would probably install the 1.9KHZ filter in the 9mhz IF,
and the INRAD 400hz CW filter in the 455khz IF.  Any ideas how this would
work?

73s John NE0P




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