[Icom] No Anti DSP Conspiracy Exists

Wed, 22 May 2002 20:45:46 -0400

Hi Adam, I would be very interested in evaluations between the Pro DSP and the
ProII DSP.
I have great respect for your knowledge and evaluation of Icom products but I
have always been puzzled by your exuberance over the 756, save maybe you have a
lack of experience with the Yaesu receivers to use as a comparison.  Not that
I'm down on Icom, my Kenwood TS-870 is no better in the DSP dept than the Icom.
I've owned two 781's and my 756 (non-pro) couldn't hold a candle to the 781's,
even the Pro made me yearn to have one of my 781's back.  As I've mentioned in
other postings, the Yaesu FT-920 is the only rig among the heretofore mentioned
radios that could handle 93-97% noise reduction through DSP filtering with very
little noticeable distortion.  I've had two 920's (still have one of them), one
with optional filters and one stock, noise reduction was just as effective on
the stock radio as the loaded one.  It's quite amazing when you compare it to
the other radios and very comforting to turn the NR (noise reduction) knob near
full stop and hear a signal with a quite background on a noisy band that doesn't
sound like a scene from "Twenty Thousand Leagues Under The Sea".  Obviously if
Yaesu can do it so can the other manufactures.  Maybe the 785?

Marty

-----Original Message-----
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.

----
Your Moderator: Dick Flanagan W6OLD, [email protected]
Icom FAQ: http://www.qsl.net/icom/

----
Your Moderator: Dick Flanagan W6OLD, [email protected]
Icom FAQ: http://www.qsl.net/icom/