[ICOM] IC-7800

[Adam Farson]

Hi Bill,

...which is about the best you can do at 45 MHz...

64.455 MHz actually. There is no problem making good filters at elevated
centre frequencies. Back in 1977, GTE Lenkurt was making channel filters at
a 36 MHz centre frequency for direct-to-line telephone carrier systems.
These filters were quite costly, but met all Bell System and ITU-R specs and
were actually superb SSB filters. I am confident that filter technology has
made some advances since then.

The Yaesu FT-DX9000 has a 3 kHz roofing filter at a high (but as yet
unknown) IF.

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 Bill Tippett
Sent: Monday, May 24, 2004 10:30
To: icom at mailman.qth.net
Subject: [ICOM] IC-7800


K5VM wrote:
 >Another possible conclusion--Sherwood is in the business of selling home
built "cures" for the "problems" he finds in various radios so he may not be
entirely objective ?

         True, but it's ARRL's data, not Sherwood's, and he doesn't have a
cure available for the IC-7800 (not likely to either since they already
use a 6 kHz roofing filter which is about the best you can do at 45 MHz).

                                                 73,  Bill  W4ZV