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Re: [Amps] Measuring IMD in a home workshop

Subject: Re: [Amps] Measuring IMD in a home workshop
From: Jim Brown <>
Date: Tue, 28 May 2019 17:55:26 -0700
List-post: <>
On 5/25/2019 8:23 AM, Peter Bertini wrote:
Unfortunately, the K3 transmitter IMD specs are not good enough for
amplifier testing.

While that's true, IMD from a K3 is VERY sensitive to output power and DC supply voltage. At 100W, it ain't grand, but it's a lot better in the range of 25-50W typically used to drive an amp. IMD also decreases with higher DC supply voltage. As I understand it, the radio is designed to run from a 13.8V supply, and 15V is the max rated supply voltage.

There's measured data on this on my website, done by K6XX.

73, Jim K9YC

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