|[AMRadio] Globe King 500C mod for 160M|
orgoblo at yahoo.com
Sat Dec 19 21:34:46 EST 2009
Hey! There you go!! Another fix! Ingenious.
I saw the tab on the band switch and frankly don't know why I didn't do the fixed C at that spot. I bet I was thinking the switch draws back from the plate tank cap but the common is to the ant loading variable. I bet this is the 'fix' WRL installed upon request. I've been told to install the C on the 160M spot of the ant coupling switch and that does not switch out the cap.
I am going to try this out this PM!
--- On Sat, 12/19/09, Jim Wilhite <w5jo at brightok.net> wrote:
From: Jim Wilhite <w5jo at brightok.net>
Subject: Re: [AMRadio] Globe King 500C mod for 160M
To: "Discussion of AM Radio in the Amateur Service" <amradio at mailman.qth.net>
Date: Saturday, December 19, 2009, 6:27 PM
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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