http://elecraft.85.s1.nabble.com/ELECRAFT-TO-TOKYO-HY-POWER-2-5-tp5113595p5113736.html
I use similar arrangement. I follow K3 recommendation of no ALC which is contrary to advice I received from THP. When using THP parameters I had problems. Been ALC free 1yr plus.
> From:
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> To:
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> Date: Fri, 28 May 2010 10:55:54 -0500
> Subject: Re: [Elecraft] ELECRAFT TO TOKYO HY-POWER 2.5
>
> The THP2.5 uses a regular 15-pin D-connector, whereas the K3 uses the 15-pin
> HD D-connector. Nothing special needs to be done, other than finding the
> pin outs from the manuals. The THP 2.5 even has pull-up resistors so early
> K3 radios will drive the band data input just fine (NOT the case with the
> THP 1.5, where you need the K3 pull-up mod). If you plan on using ALC, you
> do need the K3 negative-going ALC mod if you have an early K3.
>
> Phil - AD5X
>
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