[AMRadio] Globe King 500C mod for 160M

Jim Wilhite w5jo at brightok.net
Sat Dec 19 21:27:31 EST 2009

I installed another like variable across the existing one and tied it to 
the bandswitch button that is in use when the final band switch is in 
the 160 meter position.  When in 160 it adds the variable and when 
switched to 80 it is eliminated from the circuit.  That is the top most 
button on the switch.  I use a variable however a fixed cap can be used 
but you will have  limited tuning range.

Makes the circuit able to tune into 50 ohms provided you run full plate 
voltage on the final according to the manual.  I use mine on an Inverted 
L that is ~165 ft. with a series cap to make the antenna a 50 ohm load.


----- Original Message ----- 

> Wonder what other Globe King 500C owners have done to enable fully 
> loading on 160M to their 50 ohm antenna? I use and external L C (like 
> a tuner). I added C across the ant loading variable but could not see 
> how to use already installed swtiches.controls to swamp out this added 
> cap in order to load on 40-10M.
> I am especially interested in learning whether WRL ever modified 
> standard builds upon request for operation on 160M into a 50 ohm load. 
> I'd like to know what was the WRL fix. Standard builds sought 300 ohm 
> 160M antennas.
> Appreciate your inputs!
> 73's de Grass Valley Dave WA6PBJ

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