[Elecraft] KPA500 RF output wiring

[Jim Brown]

On 9/7/2011 10:53 PM, Johnny Siu wrote:
> The connection between the RF deck to the RF SO239 output is a pair of twisted wires instead of a coaxial jumper.  Is there any reason for such a design?

Sure. Twisted pair is a VERY effective transmission line, and that is 
what is needed.  In fact, it is a MUCH older form of transmission line 
than coax, which was developed in the 1930s. Twisted pair was first used 
in telephone transmission, and is still widely used for pro audio, and 
for computer data (CAT5, for example). This particular use is entirely 
appropriate for several reasons. First, it is physically smaller than 
coax that would be suitably rated. Second, it occupies less space. 
Third, it costs less.

73, Jim K9YC