On 2012-11-03 8:25 PM, WO0W wrote:
Perhaps you can take a portable transmitter and manual tuner to the
site. At the point where you wish to place an L network, attach the
manual tuner and transmitter and adjust the tuner for a good match.
Take the tuner away from the source of interference,
Thinking again about this, we have missed out a stage. After measuring the
tuner output impedance, we need to make a temporary L network which, when
terminated with 50 ohms, looks like the antenna. Now put the MFJ on this
terminated network and measure it's R +/- jX values which will
So, I'm looking at setting a EWE antenna up - what happens if I simply make it
a full loop? In other words, instead of driving 4' ground rods in at both ends
I run a wire between the bottom of the terminating resistor and the matching
balun.I'm going to try the shorter version first - 10
; topband@contesting.com
Date: Mon, 5 Nov 2012 08:19:12 -0500
Subject: Re: Topband: Antenna analysers in close proximity to BC station
So, I'm looking at setting a EWE antenna up - what happens if I simply
make it a full loop? In other words, instead of driving 4' ground rods in
at both
but don't know if that gains me anything.
Thoughts?? Jim R. K9JWV
From: tsho...@wmata.com
To: rodenkirch_...@msn.com
Subject: RE: Topband: Antenna analysers in close proximity to BC station
Date: Mon, 5 Nov 2012 14:02:58 +
Sounds to me, like something very close to a flag or rectangular
[topband-boun...@contesting.com] on behalf of ZR
[z...@jeremy.mv.com]
Sent: Friday, November 02, 2012 8:11 PM
To: Tom Boucher; 160 reflector; Chris G3SVL
Subject: Re: Topband: Antenna analysers in close proximity to BC station.
MFJ sells a filter for that but I dont know how well it works around
Tim N3QE wrote:
And I think clear channel stations do not cut back power at night... do
clear channel stations actually still exist?
There are about 116 AM broadcast stations in the U.S. using 50 kW
transmitter power during the day. Some of them reduce power at night,
however KFMB (760 kHz)
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom
Sent: Friday, November 02, 2012 5:21 PM
Subject: Topband: Antenna analysers in close proximity to BC station.
We ended up with a good old-fashioned link coupled parallel tuned circuit
with the
Hi, Tom;
Perhaps you can take a portable transmitter and manual tuner to the site. At
the point where you wish to place an L network, attach the manual tuner and
transmitter and adjust the tuner for a good match. Take the tuner away from
the source of interference, put a 50 Ohm dummy load
Tom,
I will be interested to see what the solution(s) will be for the BC station
interference.
Wanted to thank for the reference to the impedance problem calculators. They
are great!
73,
Bob
K6UJ
On Nov 2, 2012, at 2:21 PM, Tom Boucher wrote:
A ham friend asked me to design a
I have the same problem with a 50KW FM station a couple of miles away
affecting my Palstar ZM-30. It is useable on the rig side of an antenna
tuning unit, but most of my antennas are self resonate therefore the FM
broadcast RF rides right into the bridge making it mostly worthless when
directly
MFJ makes a filter for their Antenna analysers. I am sure that if it does not
work for you, you can get your monies back.
73..Price W0RI
I have the same problem with a 50KW FM station a couple of miles away
affecting my Palstar ZM-30. It is useable on the rig side of an antenna
tuning
Hi Tom,
I used to have the same problem with my N2PK VNA, but then I put a
switchable high pass filter in before the detector - after the
reflection bridge that is. Provided that the VNA calibration is done
with the filter switch in the same state as you intend to do the
measurement, it has
At 21:21 02/11/2012, Tom Boucher wrote:
.. but how to use the antenna analyser in the presence of a high
BC station field. Anyone any ideas?
Hi Tom,
I have 2.4KW of MW BC transmitter 300m from the base of my 160m
antenna, so I know the problem. I've found an ICE BC filter to be
pretty
It is a common solution to put a 160 meter band pass filter on the SWR
meter and it will work.
I had to do this on both 160 meters and 80 meters at A73A. The high power
AM station was miles away.
Tree N6TR
On Fri, Nov 2, 2012 at 3:22 PM, HAROLD SMITH JR w0ri...@sbcglobal.netwrote:
MFJ makes
G3SVL ch...@g3svl.com
To: Tom Boucher t...@telemetry.demon.co.uk; 160 reflector
topband@contesting.com
Sent: Friday, November 02, 2012 6:42 PM
Subject: Re: Topband: Antenna analysers in close proximity to BC station.
At 21:21 02/11/2012, Tom Boucher wrote:
.. but how to use the antenna
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