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
Hi topBanders!
I live in an area about 10km away from a BC station that transmits on frequency
981khz and whose power is 200Kw. Whenever I had tried to take measurements with
a 160m antenna- with the latest equipment on the market- it was always
impossible. The equipment was always becoming
; 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
That's an interesting idea Red and worth a try.
73
Tom G3OLB
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
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 represent
[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
...@telemetry.demon.co.uk
To: 160 reflectortopband@contesting.com
Subject: Topband: Antenna analysers in close proximity to BC station.
A ham friend asked me to design a matching network for his 160 metre end fed
quarter wave, so I asked him to provide an impedance reading using his
MFJ-259B. I would then use
A ham friend asked me to design a matching network for his 160 metre end fed
quarter wave, so I asked him to provide an impedance reading using his
MFJ-259B. I would then use the Berkley site
(http://bwrc.eecs.berkeley.edu/Research/RF/projects/60GHz/matching/ImpMatch.html
) to provide the
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
inline filter.
73
Lloyd - N9LB
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com]On Behalf Of Tom
Boucher
Sent: Friday, November 02, 2012 4:21 PM
To: 160 reflector
Subject: Topband: Antenna analysers in close proximity to BC station.
A ham friend asked me to design
, November 02, 2012 4:21 PM
To: 160 reflector
Subject: Topband: Antenna analysers in close proximity to BC station.
A ham friend asked me to design a matching network for his 160 metre end fed
quarter wave, so I asked him to provide an impedance reading using his
MFJ-259B. I would then use the Berkley
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
: Friday, November 02, 2012 4:21 PM
To: 160 reflector
Subject: Topband: Antenna analysers in close proximity to BC station.
A ham friend asked me to design a matching network for his 160 metre end
fed
quarter wave, so I asked him to provide an impedance reading using his
MFJ-259B. I would
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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