[Elecraft] K3 Transmit IMD

[Wes Stewart]

First I want to establish that I'm in the market for a
K3 and will definitely buy one---just as soon as I can
get one 2-3 weeks ARO. (Hint)

I read the digest and I saw the question was raised
about the poor transmit IMD performance of the K3 as
reported in the QST review.  If this was addressed by
Elecraft, I failed to see it, and apologize.

More recently in this message:

Date: Thu, 3 Apr 2008 11:17:40 -0400
From: "Joe Subich, W4TV" <lists at microham-usa.com>
Subject: RE: [Elecraft] K3: Would not it be nice...
To: "'Larry Phipps'" <larry at telepostinc.com>,
	<elecraft at mailman.qth.net>
Message-ID: <001401c8959d$dba95190$0400000a at laptop>
Content-Type: text/plain;	charset="iso-8859-1"


> For a graphic representation of Joe's point, check
out the  BDR section of my LP-PAN web page at 
http://www.telepostinc.com/LP-PAN.html

[snip]

Joe says,

"Phase noise, key clicks and transmitted IMD from
other stations will be the limiting factor for
receiver performance in the K3."

Which with I agree and which (again) raises the
question about the transmit IMD performance of the K3.
 What if the other station is using one?

It is commendable to strive to build the best possible
receiver but at this point what good it going to be if
every other station on the air is a K3?

Our receivers don't get to operate in a world where
the only interference is from two,
pure-as-the-driven-snow, signal generators carefully
combined into the front end.

Instead they have to deal with all of the garbage
transmitted by their neighbors.  Shouldn't the K3 be a
better, not worse, neighbor than the competition?

So I humbly propose a new transceiver "composite"
test.  Receiver performance shall be measured by using
two other like transceivers, operating at full output
power, as the signal sources for the measurement(s).

Wes Stewart, N7WS


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