[CQ-Contest] Sherwood Engineering and DSP
k7qq at netzero.net
Sun Jun 10 20:20:13 EDT 2007
The TS 870 has the same problem and just backing off on the RF gain
solves most of the problems here .
----- Original Message -----
From: "Tree" <tree at kkn.net>
To: <cq-contest at contesting.com>
Sent: Friday, June 08, 2007 5:02 PM
Subject: Re: [CQ-Contest] Sherwood Engineering and DSP
> This article is a little hard to follow without the speech:
> But - I think I might understand what is trying to be pointed out.
> If you look on page 19 at the plots of the 3 tone test - look at how
> far down the IMD products are especially the ones about half way
> across the plot. On the R4C, they are pretty much gone at that point.
> Same on the IC781. The IC7000 shows very poor performance.
> I believe this is the issue that some operators complain about when a
> radio sounds "mushy" when there is a pileup - or perhaps a lot of
> noise (noise is very similar to having a bunch of little signals in
> your passband).
> Often, this IMD in band perfomance is improved by backing off the RF
> gain. I have seen my TS850 and a friends FT1000MP have an improvement
> from having the first product down about 35 db to well over 50 db using
> a two tone in-band test.
> And - like Rob - I am anxious to see how the K3 performance ranks.
> 73 Tree N6TR
> tree at kkn.net
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