[ICOM] PRO/PRO2 vs. 775DSP

[Hans Remeeus]

Dear Adam,

Many thanks for your (as always) very enthusiast message! I agree there are 
many advantages of the nowadays DSP-technology.

I regret that I don't live in your neighbourhood. I think we can spend many 
interesting hours on this subject!

Some day I hope to be able to compare the IC-7800 with the IC-775DSP. It 
will be a tough match, HI!

The impact of a linear amplifier (I have the Acom 2000A) indeed is very big. 
This is my daily encounterment.

The Chain is as Strong as Its Weakest Link!


73,
Hans Remeeus (PA1HR)
http://www.remeeus.nl
Communication is about people, the rest is technology.


---- Original Message ----
From: "Adam Farson" <farson at shaw.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Saturday, August 20, 2005 9:13 AM
Subject: RE: [ICOM] PRO/PRO2 vs. 775DSP

> Hi Hans,
>
> Yes, this comparison of different radios is fascinating - especially
> when one is fortunate enough to try out several different high-end
> transceivers over a period of time which is sufficiently short to
> ensure that one can still remember the differences!
>
> Since I got back into HF in 1989, my operating environment has never
> been particularly favourable. I have always had to erect antennas
> under space constraints. This has led to my having to settle on a
> multi-band vertical or dipoles which were less than a quarter-wave
> above the deck. The impact of this is that an amplifier (initially
> 500W, now 1kW) is a must, and that my receiver needs to be equipped
> with the tools required to restore a severely compromised signal to
> the point where I can copy it. This issue became especially acute as
> we approached the bottom of the sunspot cycle.
>
> The DSP architecture of the 756Pro series, the 7400 (746Pro) and 7800
> offer these tools. I am usually able to adjust the DSP IF filtering,
> Twin PBT, NR, NB, manual notch etc. to recover intelligible audio
> from a severely-degraded SSB or CW signal. At times, there was some
> signal-quality degradation - but at least we "got the message
> through".
>
> On the transmit side, the DSP audio-management tools (bass/treble
> equalisation, occcupied-bandwith selection and compression) enable me
> to set up the transmitter to produce an SSB  signal which "gets
> through", conserves transmitter power and sounds pleasant to the
> listener.
>
> Ultimately, the radio purchaser will have to make his own decision
> according to what he prefers and values most. From my perspective, the
> signal-management power which DSP technology places in my hands has
> settled the debate (at least for me) in favour of a 100% DSP-based
> radio architecture.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>