----- Original Message -----
From: "Darwin, Keith" <[EMAIL PROTECTED]>
To: "Elecraft Reflector" <[email protected]>
Sent: Friday, February 29, 2008 6:41 PM
Subject: RE: [Elecraft] K3 SSB transmit IMD
I got a different read.
- ARRL measured -23 dB on the QRP rig.
- ARRL checked the K3/100 (which they have) at the QRP level
and got -27
dB.
- ARRL called Elecraft. They talked.
- ARRL published the value from the K3/100 number.
- ARRL reported that Elecraft suggested those worried about
the IMD
performance on 17m could QRP to 8 watts.
I didn't see anything in there where either the ARRL or
Elecraft
admitted that there is any problem; only some confusion and
disparity on
the measurements.
- Keith N1AS -
- K2 5411.ssb.100 -
- K3 Wave 3 -
--------------------------------
The key statement is that ARRL tested the second radio "in
accordance with (Elecraft's) new guideline..."
To me, that means they had to throttle the 10 watt PA back
to 8 watts (Elecraft's new guideline) to get the -27 dB
reading. If you run the 10W PA at full power on 17 meters
and above, IMD will be worse than -27dB.
N6KR's message earlier this morning indicates that Elecraft
is working to improve the SSB setup procedure or SSB
algorithm to improve the real-world (tones externally
applied) IMD. I think I've got it straight.
Dave Hachadorian, K6LL
Yuma, AZ
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