[ICOM] Is this for real?

[Adam Farson]

Dick, John,

There would (presumably) be an improvement in overall DSP performance (lower
filter shape factors, better NR operation, etc.) if the new radio adopted
the 48 kHz DSP IF and much more powerful TI DSP IC used in the R9500
receiver. An ADC running at 48 kHz would most likely have several dB higher
dynamic range than the part used in the Pro3.

A "pure DDS" synthesiser (as found in the IC-7000) would offer lower phase
noise, as it would have no PLL's. Selectable roofing filters would improve
close-in receiver "numbers" (at least on the lab bench.)

Relay-switched front-end BPF's, and possibly an optional preselector would
improve the strong-signal performance of the front end. A high-voltage
MOSFET PA would offer lower IMD. A DSP-based spectrum scope would have
narrower minimum resolution bandwidth (possibly 100 Hz, vs. 1 kHz in the
IC-756Pro3). This would make the scope much more useful for checking IMD and
spectral purity of received signals.

In sum, I believe there would be sufficient improvement in performance and
functionality over the 756Pro3 to justify the new model at about a $5K price
level. This would be a radio offering much of the IC-7800's performance at a
significantly lower price.

All the above is purest speculation, of course. 

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 Dick Flanagan
Sent: 29 September 2006 15:27
To: ICOM Reflector
Subject: RE: [ICOM] Is this for real?

At 03:20 PM 9/29/2006, you wrote:
 >Now for the purely speculative bit:
 >
 >http://www.ab4oj.com/icom/r9500/ic7x00.html

If your speculation proves true, will this be a significant improvement over
the 756ProIII?

73, Dick
--
Dick Flanagan K7VC NV SM
E-mail: k7vc at arrl.org



Scanned for viruses by Blue Coat
http://www.WinProxy.com/