[1000mp] Updated Sherwood Engineering IMD Measurements

[A. J. Cioffi]

I have a stupid question.  What is a roofing filter and what does it do?

Tony - N2KI
SYSOP - N2KI DX CLUSTER
dxc.n2ki.com:7300
RF Gateway 145.650
Website: www.n2ki.com
DX Spoken Here


> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-
> bounces at mailman.qth.net] On Behalf Of Bill Tippett
> Sent: Thursday, 07 October, 2004 16:09
> To: 1000mp at mailman.qth.net
> Subject: [1000mp] Updated Sherwood Engineering IMD Measurements
> 
> 	Rob Sherwood has updated IMD measurements for the
> FT-1000 Field, Elecraft K2 and IC-7800:
> 
> http://www.sherweng.com/Dayton_2004/Dynamic_Range_Data.pdf
> 
> Nice to finally see some consistency in results for the FT-1000D,
> FT-1000MP, Mark V and Field.  It never made sense to me that
> ARRL measured such great differences (10 dB).  Apparently that
> may have been caused by W8JI's famous Noise Blanker problem
> (with the units under test having different settings even with NB Off).
> 
> 	I understand we may soon see some independent
> measurements with the Inrad roofing filter installed.
> 
> 				73,  Bill  W4ZV