[Elecraft] Photos of K4 prototypes

[Kevin Cozens]

On 2019-05-17 9:54 a.m., Grant Youngman wrote:
> I noticed the "REF IN" connection has a hole plug in it.  I wonder if this means it’s an add-on option?

Hm... Possibly a future input for a 10 Mhz external frequency standard signal?

-- 
Cheers!

Kevin.

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