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
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:[email protected]
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.
