I would say for CW, 80 dB DR3 is adequate most of the time.
Certainly 85 dB is adequate on CW virtually all the time.
W8JI and I completely agree on this.
On SSB 70 dB is likely OK most of the time due to transmitted IMD
products from the other guy.
75 dB for SSB would be better.
At the end of the day, the operator has to enjoy using the radio.
If you don't like the radio, who cares what the numbers are.
73, Rob Sherwood, NC0B
Curt Gamble wrote:
> Little more info. thunderstorms again last night just after net
> time. 73, Curt
>
> -------- Original Message --------
> Subject: [TenTec] "Being a Contrarian . . ."
> Date: Mon, 31 Jul 2006 08:23:39 -0400
> From: Bill Tippett <btippett@alum.mit.edu>
> Reply-To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> To: tentec@contesting.com
>
>
>
>W3ULS:
>
> >The close-in receive specs for the "subreceiver" are in the 70 dB range.
>As I understand it, the subreceiver is basically a Jupiter (no steroids
>here). And having read (I believe it was R. Sherwood) someone's saying
>that 70 dB IMD3 is about all anyone will ever need 95% of the time, the
>old Jupiter holds up pretty well in distinguished company.
>
> Much improved Sub-RX performance from
>O to O2 was one of things I noted in both reviews.
>RSGB's measured IMD performance at very close
>spacings (1-2 kHz) even exceeded rigs like the
>IC-7800 and FTdx9000. I also noticed 2nd order
>IMD for the Main RX was much improved. Not sure
>whether this was just sample variation or actual
>improvement due to design changes, but I do not
>have good Sub-RX performance in my Orion.
>
> I believe it was W8JI who said about 85
>dB IMD is sufficient most of the time, and his
>comment did include 160 meters.
>
>http://www.w8ji.com/receiver_tests.htm
>
>...but sometimes he sees signals that
>range over 95 dB. ;-)
>
>http://www.w8ji.com/receiving.htm
>
>
> I felt ARRL's review was very balanced
>and one of the better and less fluffy reviews
>they have ever done. I was frankly surprised
>RSGB did not pick up on some of the questionable
>changes in O2 (like Notch being after the AGC
>loop). Let's hope ARRL's reviews become more
>realistic like this one. Of course it's always
>easy to be more critical when a rig has outstanding
>performance that if it's a dog and you are trying
>to find something good to say.
>
> 73, Bill W4ZV
>
>P.S. Copying KH8SI through the on-frequency
>jammers last night was a pleasure with Orion.
>
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>
>
>
>
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