MFJ has a technician? Pretty amazing, Vic :-)
Phil W7OX
On 12/15/14 9:28 AM, Vic Rosenthal 4X6GP/K2VCO wrote:
The good news is that I called MFJ, got a
technician immediately, he agreed that the 30M
trap is the problem, and said he would send me a
new one under warranty. Elecraft-style service
(so far).
The bad news is that despite the statement in
the manual that it is rated at "1500W CW," he
told me not to exceed 800-1000 watts. Not
Elecraft-style design/documentation!
So if you have an R8 or similar antenna, be
warned. I wasn't tuning up or running RTTY -- I
was calling CQ on 40M running about 1200W.
Other bands are unchanged but 30 and 40M are gone.
Thanks to everyone that responded.
On 15 Dec 2014 15:07, David Cole wrote:
Hi,
No matter what happens, you will probably end
up taking the antenna
down... If nothing else to check to be sure it
is fine...
Grab an analyzer and connect it as close to the
antenna base as
possible, and see if it is resonant on all
bands... Probably won't
anymore. If you are lucky, it is some strange
feedline thing, or a
connector issue, but having the antenna work on
some bands, while not on
others reeks of blown trap. I fear your
diagnosis is in fact
correct...
If you are going to "fix" it, and if it were
me, I would get a trapless
antenna of some sort... No traps blow. I
currently use a GAP
Challenger DX, (trapless), and have a band by
band review of it at:
http://nk7z.net/review-of-the-challenger-dx-antenna-by-gap-antenna/
The antenna takes power, and does not break, I
have run 1000 Watts into
it on RTTY for 15 minutes with no issues. I
have had it up for at least
7 years, and I think 10 or more years. Never a
problem beyond the three
radials coming off once... It is a pretty good
performer on 40, and 20.
I finally got one of the mono gaps, and it does
a good job. I do take
it down every few years and check things, and
change out anything that
looks like it is going bad.
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