Thanks for the response and the calculations Don. Lots of offline responses to
my query.
The antennas use 90 radials 40' to 150' with the average at 66'
Your option B is the way I configured the L network and your numbers are very
close to mine.
The second variable cap was set aside to use
That reminds me of an episode that happened here a while back. When I got
serious about top band I discovered that the noise was too much. I tracked
down the offending power poles using the method you mentioned. Noted the
pole numbers from the metal tags that were attached. Called APCO and in a
Hi Stan,
There are countless thousands of poles within five miles of my
QTH, his method could not possibly work here. If I tried, I
would lose my excellent reputation with my power company
RFI crew.
I prefer to leave my shack and verify the pole rather than guessing
which one it might
Frank,
I have a friend who has used the RF Gain control as needed, balanced antenna
and accurate, equal measurement of the strength of the noise off center by an
equal number of degrees CW and CCW from the actual direction to determine with
great accuracy the direction of the noise. Then
I cut my top loaded "T" (85' at top, 10' high feed, elevated 8x 125'
radials) for 1825. Then 3 equal value series capacitors are shorted by
PCB relays (10a, 5Kv coil insulation) to switch in C, C/2, and C/3
(C=4000pf for this antenna). That yields 4 by 40KHz spaced segments
with > 50KHz 2:1
Hi Jeff,
My consistent practice is to identify the highest frequency where
I can hear the RFI in my shack. I then use my directive antennas
to determine the bearing on which I should search. I can
consistently determine azimuth within better than ten degree
accuracy on any band. I begin my
Jim, I mentioned relay cut-in of L's and/or C's at the base of an antenna
to help cover all of 160M. On my tuner web page I mentioned does not show
this recent update I have made at my shack, but I have a relay that shunts
out turns of my 160M coil to help me QSY to top end of 160M phone in
My opinions:
All-band antenna tuners make a set of compromises to produce a tuner that
fits in one box.
They may not be able to handle legal limit on RTTY. Or legal limits CW/SSB
on other bands, especially the "extreme bands" of 10M and 160M.
They often have 10-turn (or more-turn) roller
> I have e-mailed Palstar but, to date, they have not responded. I would
> love it if someone would come up with a high power, fully weatherized,
> remote tuner.
I was in a dilemma back in Illinois, I had a Heights 100' aluminium
fold over tower but insufficient land to put down sufficient
