Re: [Repeater-Builder] Coax length, etc.

[Kevin Custer]

Ross Johnson wrote:


So will someone post a simple rule of thumb... If you have the option 
of optimizing cable length from PA to first cavity, IE you haven't 
made them yet what's the best "simple" rule of thumb to follow to 
build them to avoid reactance. 1/2wl if allowed minus coupling loop 
depth? Or is that past a simple thumb.


Simple rule - there is none.  The length can be determined 
experimentally as outlined in several publications of various duplexer 
manufacturers.

I use the length I need to do a good job - then, if the transmitter is 
unhappy, I build a cable long enough to do the job and satisfy the 
transmitter.

Kevin