I made mine for my Yaesu FTDX101MP to the LA1K.
Ordered a cable from Amazon and a modular connector from Amazon.. (hope this picture takes…)

As you can see the Jienk cable has gold plated connectors which you fit into the ANBEST DB15 solder less serial 15 pin port.
Is your connection 15 pin to 9 pin on your Elecraft?
This cable fabrication was rather easy with these two parts.
As a result, when my Yeasu changes bands the LA-1K also immediately changes bands as well PRIOR to the introduction
Of any carrier or transmission.
Art ?- W1SWL
artgumbus@...
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On Nov 5, 2022, at 1:45 AM, iggy7117 <W2KU@...> wrote:
I am looking for an interface cable for the Elecraft K4 to LA1K? Is there one available or did you have to make it?