John:
The OD of the barrel is 5.5mm and the ID is 2.1mm. There are several dc power connectors on the market with 5.5 mm OD barrels, but some have a 2.1 mm ID, others are 2.5 mm ID.

Hope this answers your question.

73's,
John AA0VE

n3drk wrote:

The male connector for the dc supply on the back of the K2 mates with the dc power jack. In the manual it states this is a 2.1mm male connector. What are the inside and outer dimensions?
john

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