[TenTec] Sherwood Receiver Tests?

[Larry Menzel]

Maybe this helps:
The Orion II has the highest close-in dynamic range at 1 kHz spacing I have
ever tested. At 50 kHz and 20 kHz, the dynamic range is synthesizer noise
limited at 95 dB. At 5 kHz the synthesizer loop is quieter, and it measures
97 dB on 3rd order products. At 2 kHz it was 95 dB with the 600 Hz roofing
filter and at 1 kHz it was 95 dB with the 300 Hz roofing filter, both on
IMD, not phase noise. All tests were on 20 meters.

http://www.eham.net/reviews/detail/5564


Rob posted this yesterday.

Larry, N0XB


-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Rick Williams
Sent: Monday, April 17, 2006 11:54 AM
To: tentec at contesting.com
Subject: [TenTec] Sherwood Receiver Tests?

I've been looking at the test results and was wondering where I can find out
what roofing filters were used for the 2 kHz dynamic range tests.  The
footnote suggests a similar value at 1 kHz with the 300 Hz roofing filter
engaged.  Unfortunately the footnotes do not cite what was done (i.e what
roofing filter was used) at 2 kHz with the Orion II.
 
In an earlier article (link below) Sherwood tested the Orion (original) at 2
kHz spacing with the 1000 Hz filter and a 2 kHz dynamic range of 92 dB (vs
93 dB in the current table) is published.
 
http://www.sherweng.com/Dayton_2004/Dynamic_Range_Data.pdf
 
Has the Orion (original) ever been tested with a 600 Hz InRad in the 1000 Hz
slot? Would I be correct in assuming a slightly better narrow spaced dynamic
range with the 600 Hz filter?
 

73, 

Rick 
VE7TK

Website:  http://www3.telus.net/ve7tk  

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