[1000mp] QST Product Reviews whitewash

Tue, 16 Apr 2002 15:02:21 -0400

>   You are overreacting to my opinion. It is my opinion that 
> making the IMD
> measurement appear 6dB better is a form of whitewash

I don't know, Jeff; I gave a lot of the reasons that ARRL continues to
report IMD relative to PEP and none of them were "it makes the manufacturers
look better."  Your continuing the "whitewash" accusation makes me think
that you did not believe me.

I don't think that it does make the manufacturers look better -- -30 dB PEP
is the same as -24 dB single tone, for two-tone tests. Those who understand
what those numbers really mean are not at all confused by the reporting
reference level. Those that do not understand would believe that a rig that
is reported at -24 dB single tone is 6 dB worse than a rig that is reported
to -30 dB PEP.  Although I don't think that PEP reporting was the best
choice some 20 years ago, I think the confusion factor among those who would
not fully understand the difference is a good reason not to change.

73, 
Ed Hare, W1RFI
ARRL Lab
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Internet: [email protected]
Web: http://www.arrl.org/tis

> -----Original Message-----
> From: Jeffrey Pawlan [mailto:[email protected]]
> Sent: Tuesday, April 16, 2002 11:15 AM
> To: '[email protected]'
> Subject: RE: [1000mp] QST Product Reviews whitewash
> 
> 
> On Tue, 16 Apr 2002, Hare,Ed, W1RFI wrote:
> 
> > > Even if we take the QST whitewash method of specing IMD
> > > relative to PEP output
> > > which makes it appear as 6dB better:
> >
> > Jeffrey,
> >
> > It is not a "whitewash."
> >
> > Do you intend to be so insultive?
> >
> 
> 
> Dear Ed,
> 
>   You are overreacting to my opinion. It is my opinion that 
> making the IMD
> measurement appear 6dB better is a form of whitewash. As I 
> previously very
> respectfully stated, I would never report IMD to one of my 
> customers in that
> manner, nor have I ever seen it reported that wasy in any 
> commercial publication
> or engineering book.
> 
> 73,
> 
> Jeffrey Pawlan, WA6KBL
> 
> 
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