[Icom] No Anti DSP Conspiracy Exists

Wed, 22 May 2002 11:11:16 -0700

Marty,

An IC-781 graced my shack from mid-1993 until late 1998. I found that it was
lacking in adjacent-channel selectivity on SSB, so I installed the "NATO" filter
mod - FL-44A in lieu of FL-96. I also replaced the stock FL-102 with an FL-223
for narrow SSB.

Then, I bought an "original" IC-756. The 756, with its DSP NR, outgunned the
781+ outboard NIR-12 on weak/noisy signals, and offered superior
adjacent-channel selectivity with the FL-222/223 SSB filter pair installed. So I
reluctantly let the "old girl" go.

Two years ago, a Pro replaced the 756, and I found it even better all around. It
even has a tuneable pre-AGC notch filter, unfortunately omitted from the 756. I
have just brought back a Pro II from Dayton, and will be evaluating it against
the Pro.

There is no gainsaying DSP-based HF radio architecture. Defence suppliers such
as Rockwell-Collins, Harris and Rohde & Schwarz have been using DSP for years in
their HF equipment. it is only in recent years that DSP chipsets have reached a
price/performance level accessible to the amateur community.

Radio design is now at the point where classical analogue designs are no longer
cost-effective to manufacture, and DSP will only get faster and better. So, my
advice is to relax and enjoy it. As an alternative, analogue radios will still
be available in the second-hand market for years to come.

My spell-checker corrected the spelling of the word "conspiracy".

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Note new e-mail address:
mailto:[email protected]

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of HFSSB
Sent: Monday, May 20, 2002 07:15
To: [email protected]
Subject: RE: [Icom] No Anti Dsp Conspiricy Exists

Funny, I've owned the 775DSP and two 781's and they were all superior to my
756Pro, haven't tried the Pro II and as I've posted before, best DSP radio I've
had is the FT-920.  The noise reduction DSP on that radio is second to none
(have not tried an 1000MP or V).
Marty KT4K

-----Original Message-----
To: [email protected]
Subject: Re: [Icom] No Anti Dsp Conspiricy Exists
Mike-
Had a 775DSP and a 781. The 756 Pro is a better radio.
Andy  K5VM

----- Original Message -----
> > Subject: Re: [Icom] No Anti Dsp Conspiricy Exists
...If you have not tried an R-390A, you just don't know.  I have one, and
> an IC-781.  There are things.... well... why waste it, you got to try it
> or you just don't know.> Mike.

----
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