Yaesu's secret was the ARRL. Unless things have changed they test at one frequency and assume the other bands produce the same results.

I'll reverse the question, what has Yaesu done to rigs since 1991 that they can't reproduce those numbers?

On 10/14/2016 10:03 PM, Dave Hachadorian wrote:
Yaesu FT-990, 12V finals
3rd order TX IMD  -38dB
ARRL Review 11/91

ARRL heaped glowing praise upon this rig way back in 1991 for its
Tx IMD performance. So, what was Yaesu's secret, and why haven't manufacturers figured it out and capitalized on it ever since?

Dave Hachadorian, K6LL
Yuma, Arizona

-----Original Message----- From: Kevin
Sent: Friday, October 14, 2016 5:14 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3S QST Article

The cause for this is the use of 12V finals. It would be much
by moving to 24 or 50V finals.

Move the /K3s II/ to 50V finals, say a pair of MRF 150's, limited
to 150
or 200W max output. Design/Sell an outboard 50V switching supply
of 15-20A continuous current, with a 10A 12V switcher built in
for the
rest of the radio.

On 10/14/2016 1:33 PM, Bill Leonard N0CU wrote:
I would not expect the synthesizer (old or new) to be a
contributor the IMD
issue. Hopefully someone will correct me if that is a bad
assumption. To me,
the primary issue appears to be the linearity of the two RF

R. Kevin Stover
FISTS #11993
SKCC #215
NAQCC #3441

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