[AMRadio] Globe Scout 65A Question


Jim Wilhite w5jo at brightok.net
Fri Sep 21 12:30:44 EDT 2007


George have you tried to load it into a dummy load.  Those things will 
barely do 50 ohms on the lower bands and really prefer 70 ohm impedance.

Try it into the dummy load and if it is normal, then your antennas are 
exhibiting some reactance that you will have to address.

Jim/W5JO



> Good morning AMRadio members,
> I've been lurking on the AM list for a number of years, but have not 
> been active on AM in quite a while. However I've become interested in 
> getting back on AM this winter. Primarily on 160 and 80m.
> I've recently acquired a Globe Scout 65A and am having some 
> difficulties getting
> it to load properly. I've never owned a WRL transmitter before so I've 
> no previous knowledge to draw on.
> Here's my problem:
> According to the manual it should load properly into 50 ohm antennas. 
> I have three coaxial fed antennas for 160m and 80m. But none of the 
> antennas will load normally. In all cases, the best I can get is about 
> 15 watts of output. And that is with the loading control set at 
> minimum. In fact the loading control setting makes no difference, from 
> minimum to maximum. I get a good plate dip, but only about 40 mills on 
> 160 or 80m. That's less than half the current the manual says I should 
> be able to get.My antennas all display an swr of 1.5 to 1 or lower. 
> Two of the antennas are inverted V's using a balm into 50 ohn coax 
> feed. The other is
> a 160m vertical "t" configuration with a matching network at the feed 
> point.
>
> I also have a 285 ft long wire. So I attached it to the 65A. And it 
> loaded up fine, per the loading instructions in the manual, at 130ma 
> plate current.
> My question is:  Why does it load normally into the long wire, but not 
> into my three
> 50 ohm coax fed antennas? The manual indicates it should, but it 
> won't. The antenna
> loading network does not seem to like the 50 ohm antennas for some 
> reason.
> I'm baffled by this problem?
> I would appreciate any comments / suggestions about how to cure this 
> problem.
> Thanks,
> George KE4HJ
>



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