[TenTec] ARRL Reviews

[Don Jones]

RE: 3kHz RBW...
That is pretty freaking stupid. 
Here is a dark little secret about spec an's - most of them have 3dB RBW
slopes - not 6dB. I doubt the ARRL spent the $$ for a Agilent PSA or Rhode &
Schwartz EMI receiver.
I would hope that they would use a spec an with a 6db slope RBW's.
Thank you Bill for the heads up! Last time I checked Sherwood's web site,
the TS590 and EAGLE were placing very high in the performance results. 
Oh well - At least I was happy for a day! LOL!

Don Jones KO7i
Arlington, WA 

-----Original Message-----
From: Bill Tippett [mailto:btippett at alum.mit.edu] 
Sent: Wednesday, August 31, 2011 1:26 PM
To: tentec at contesting.com
Subject: Re: [TenTec] ARRL Reviews

KO7I:

 >This is the most useful bit of info that has come across my computer's
screen in the past few months.

         And possibly the most misleading.  ARRL changed their 
methodology for measuring IMD around 2007 by using a 3 Hz BW spectrum 
analyzer to separate IMD effects from phase noise effects.  The human 
ear has ~50 Hz bandwidth at best  so their results are very 
misleading and not comparable to earlier ones listed on the same 
chart.  If you want meaningful (i.e. what you will hear with your own 
ears) results that are comparable over time stick to Sherwood's summary.

http://www.sherweng.com/table.html

                                         73,  Bill  W4ZV