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@alum.mit.edu]
Sent: Wednesday, August 31, 2011 1:26 PM
To: tentec@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
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