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, pu
It seems the thread was gone off the original subject, but and it may have
been mentioned before but with my arrays I used an LP-100 with a low power
transmitter as a source. The high signal levels completely swamps out BC and
other signals. It reads complex impedences very accurately
ection 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 so
: w...@w8ji.com
> To: rodenkirch_...@msn.com; 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
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
f
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 an
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 fe
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
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 t
That's an interesting idea Red and worth a try.
73
Tom G3OLB
WO0W wrote:
___
Topband reflector - topband@contesting.com
"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 site
(http
One way to confirm that it is the BC station is to test the antenna during
the day then at night when the (most) BC stations reduce(s) power. You
might even be able to take a valid measurement when the BC station power is
reduced.
Dave WX7G
___
Topband
On 11/03/2012 11:00 AM, Pete Smith N4ZR wrote:
I just lugged my TS-930 out to the tower base. It took all of 5 minutes
to set the Omega match where it needed to be.
I have a two conductor cable permanently run from the tower base to
the shack, where it is wired to key the rig. That way, all I
I just lugged my TS-930 out to the tower base. It took all of 5 minutes
to set the Omega match where it needed to be.
I wonder what these BC stations run at night - my local one on 1550 runs
a KW daytime and 6 watts at night. Single 6L6?
73, Pete N4ZR
Check out the Reverse Beacon Network at
2, 2012 8:11 PM
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 serious
BCB RF; 10KW at the high end of the band in 2 directions in about 7-8 miles
doesnt bother my unfiltered 259B nor do the FM a
I had the same annoying problem when troubleshooting my 160M phased
vertical array. Using the MFJ259, neither vertical seemed to have a
j=0 point anywhere near the 160M band, and the readings jumped around
a bit. I concluded that it was AM BC interference. There is a local
station on 1490 a few mil
> -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 para
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) S
pband [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 a
Chris G3SVL"
To: "Tom Boucher" ; "160 reflector"
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 analyser in the presence of a
t;
> -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 frien
The AIM 4170 (and probably some others) allows you to calibrate THROUGH
filters and coax, etc, to the far side. That way a high pass filter in
front of the unit is completely transparent, and you can see stuff on the
other side with the filter's impedance, passband ripple, etc taken out.
All done
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 g
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
nt: 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 th
ncies" 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 a
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 m
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 nec
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