[ICOM] Pro 3 and 7000 Tests by Sherwood

[John Geiger (NE0P)]

Hi Jan,

I agree on Rob Sherwood being the best in the business on receiver measurement.  The "evidence" I was referring to was completely subjective, antecdotal evidence.  Most people seem to mention that the 756PRO2 has a better receiver. That was why is was surprising to see that the objective numbers say otherwise.  After seeing that, I don't think the extra $500 for a PRO2 would be worth it just to get an adjustable NB and sharp vs soft filtering.

73s John NE0P


---------- Original Message ----------------------------------
From: "Glen Rosenthal" <n0nr at hotmail.com>
Reply-To: ICOM Reflector <icom at mailman.qth.net>
Date:  Thu, 30 Mar 2006 16:35:08 -0700

>If you are looking at the receiver comparison table, also read the white 
>paper "A discussion of measurement accuracy and sample variation".
>
>www.sherweng.com
>Under "How to Tips, White Papers and Presentations", pick "Receiver 
>performance".
>
>Sample variations of a few dB are normal, and the parameter of 1 or 2 dB 
>difference in receiver performance should not be reason enough to pick radio 
>A over radio B. A significant difference of 10dB or better in close-in 
>dynamic range is a big deal compared to 1 or 2 dB.
>
>Also, if one is looking at wide spaced dynamic range numbers, if radio A is 
>90 dB and radio B is 99 dB, this is NOT a big deal since radios rarely fall 
>apart with strong signals at wide spacings. However, wide spaced numbers may 
>have more significance in special cases like Field Day and in Multi-Multi 
>contest stations with a "run station" and a "spotting station" on the same 
>band where the receiving station is essentially "in the field" of the 
>transmitting station.
>
>*******************
>Jan Robbins swanman at cfu.net wrote:
>Tue Mar 28 21:25:29 EST 2006
>
>Since Rob Sherwood uses the BEST testing methods known in the industry,
>and since his results are widely recognized as the MOST RELIABLE among
>third-party testers (and offer by far the most extensive and precise
>comparisons), I'd sure want to know who ELSE thought he had anything
>better to say and why, before I wondered a minute what "someone else"
>thought.  Who is qualified to judge the "standard," pray? Rob's been
>doing this for 20+ years, and everybody in the industry knows his
>results are more accurate than others and stand up over time, not to
>mention that he has no "vested interest" in the various brands, and that
>he, almost single-handedly, finally got ARRL labs to use HIS methods.
>As someone said a long time ago, "When you hire Michelangelo to paint
>the Sistine Chapel ceiling," don't ask a schoolboy to judge and correct
>it."   Jan N0JR
>
>John Geiger (NE0P) wrote:
>
>It is interesting that the 756PRO3 has slightly worse performance (probably 
>within margin of error) as compared to the 756PRO.  Can anyone else confirm 
>that they are so close in receiver performance?  Most evidence seems to say 
>otherwise.
>
>73s John NE0P
>
>
>---------- Original Message ----------------------------------
>From: Bill Tippett <btippett at alum.mit.edu
>Reply-To: ICOM Reflector <icom at mailman.qth.net
>Date:  Tue, 28 Mar 2006 10:36:56 -0500
>
>
>
>        FYI Sherwood recently added
>data for the IC-756 Pro III and IC-7000 to
>his receiver performance test data table:
>
>http://www.sherweng.com/table.html
>
>                        73,  Bill  W4ZV
>
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