[CQ-Contest] $1000 receiver performance

[Scott R.]

> As I read it, the TS-850 has better Blocking dynamic range (130-140 
> dB), which is noise-limited on the Omni-VI (123 dB). The TS-850 also 
> has better IMDDR (99-100 dB) than the Omni-VI (97-98 dB). These
> results 
> based on the ARRL Lab tests as published in QST.
> 
> Nevertheless, both are excellent rigs for contest use.
> 
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net

At 20 kHz spacing - which isn't useful as a determiner of "contest
grade" receiver performance or anything else real-world.  There has
been endless discussion of this over the past few years.  For a primer,
have a look at Tom Rauch's discussion at
http://www.w8ji.com/receivers.htm
and http://www.w8ji.com/receiver_tests.htm - JI contends that 10 kHz is
kind of useless, much less 20 kHz. 

The discussion of the ARRL moving to additionally do 5 kHz spacing
tests starting with 2001 product reviews is in the July 2001 QST, page
80.  Specifically discussed is how 20 kHz spacing tests do not
characterize real-world crowded conditions very well. 

Try the Sherwood Engineering website for a comparative table of
receiver performance at close-in spacing as well
http://www.sherweng.com/table.html 

I'll say this apologetically, politely, but there is no way a
TS850S-class radio stacks up to an Omni-VI under contest conditions.  

73
Scott Robbins W4PA


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