[CQ-Contest] IC-756PRO

[Lee Buller]

Peter, WW2Y, had some interesting remarks concerning this radio.  I started
looking at this radio and almost choked at the price of $2999.95.  I do not
think the bells and whistles are worth a Grand!  After reading about all
the filtering or lack there of...it is off the short list.

I would like to see how the 756Pro and the TT Pegasus would match up.  I've
been reading all about this on eham.com.

I think I will keep the IC-765.

Just a point of discussion.  No harm meant.

Lee, K0WA



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>From Igor Sokolov" <ua9cdc at dialup.mplik.ru  Tue Feb 15 22:09:28 2000
From: Igor Sokolov" <ua9cdc at dialup.mplik.ru (Igor Sokolov)
Date: Wed, 16 Feb 2000 03:09:28 +0500
Subject: [CQ-Contest] IC-756PRO
References: <38A9942F.7A738DC4 at sarnoff.com>
Message-ID: <007101bf7801$58718bc0$435efea9 at dialup.mplik.ru>


> I would be highly suspicious of this thing. First, the 15 Khz filter in
> the 1st IF  is useless because too much
> energy from all of the signals passing through will clobber the DSP.

What if DSP is 24 bit AD converter and 36 bit processor combo that supposed
to have the dynamic range of around 140db (may not be exact figures, just
taking them from memory)

 And
> these signals that are many Khz away will modulate the AGC while
> listening to the desired signal at a narrow bandwidth.

What if AGC sampling is taken AFTER the DSP filter?

> The second design fault is that there's no narrow  crystal filters in
> latter IF stages to protect the fragile DSP stuff
> from crunching over that will create digital artifacts in the passband,
> ugh. Just imagine how much processing
> power and speed is required to process this properly. They exist but,
> not cheap.

That is my consideration as well but read the reports of the users on the
Icom reflector. They say it is just THE type of DSP you refer to.

>  This radio may be fine  for casual operating on a quiet band, but may
> be a disaster in a crowed contest enviroment.

You may be right but there must be different reasons for that.

>    An Icom representative at our local contest club meeting said this
> radio is the competitor of the Yaesu FT-1000MP.

73,
Igor, UA9CDC



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