[TowerTalk] Coax Stubs for SO2R

Jim Brown jim at audiosystemsgroup.com
Tue Sep 8 18:32:12 EDT 2015


On Tue,9/8/2015 2:14 PM, Mike Smith VE9AA wrote:
> No change switching stub in or out,

How are you "switching the stub in or out?"  As others have noted, if 
you insert a switch, the switch, as well as any coax between the tee in 
the line and the switch makes the stub longer, which tunes it to a lower 
frequency.

>   so I took Jim’s(K9YC) suggestion and moved the stub farther away from the transceiver.

Mike,

You've completely missed the point of my article. You've got to MEASURE 
these impedances and find the voltage peak on the line. You've also got 
to study the output circuit for your amp (or use the table in the link) 
to figure out the correct length of cable between stub and amp.

73, Jim K9YC




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