anti-jamming antenna on Radio Free Asia website
Dan Jacobson
brew anti-jamming antenna.
I asked them to make an English page along with the Chinese page, but
email failed.
tommyknocker
Couldn't you just run the Chinese text through babelfish or another
online translation service? It will read a little weird but you should
be able to get the general idea.
N8KDV
Dan Jacobson wrote:
There was some interesting anti jamming antenna projects in some past
issues of the WRTH by a fellow named Vollard.
He recently passed away. I'm not sure offhand about which years issue it
was featured.
Someone else may know.
Steve
Holland, MI
Drake R7, R8 and R8B
http://www.iserv.net/~n8kdv/dxpage.htm
Maximus
"Strength and Honor"
"N8KDV" <n8...@nospam.iserv.net> wrote in message
news:40579133...@nospam.iserv.net...
doc
wrote:
here it is in english
http://www.rfa.org/front/sira/
regards
doc
JOE
> Couldn't you just run the Chinese text through babelfish or another
> online translation service? It will read a little weird but you should
> be able to get the general idea.
Step 4 as translated by Babelfish - kinda fun!:
4. Evenly puts the radio according to the chart superior appearance on the
tin foil, intersects with two bungees crosses the radio fixes on the board.
By now, the radio antenna and the second antenna simultaneously were in the
vertical glued wood the position. The radio antenna completely pulls out,
the second antenna highly should slightly be lower than the radio the
antenna. Thus, the system completed.
Justa-lika-dat
N8KDV
doc wrote:
Would have been nice I suppose if they would have given Villard credit for
the design.
CW
published in English. Do a search. I bet it is still out there.
"Dan Jacobson" <jid...@jidanni.org> wrote in message
news:874qsol...@jidanni.org...
tommyknocker
Sounds kinky. "I think I'm turning Japanese, I really think so..."
Yuri Blanarovich
>4. Evenly puts the radio according to the chart superior appearance on the
>tin foil, intersects with two bungees crosses the radio fixes on the board.
>By now, the radio antenna and the second antenna simultaneously were in the
>vertical glued wood the position. The radio antenna completely pulls out,
>the second antenna highly should slightly be lower than the radio the
>antenna. Thus, the system completed.
Sounds like something from Art's post or patent writeup, no?
BUm
Tom Sevart
"doc" <docwh...@despammed.com> wrote in message
news:346f50t1unv3g1r8a...@4ax.com...
> here it is in english
> http://www.rfa.org/front/sira/
Looks like they're simply using directivity to null out the offending
signal. Which, as the website states, if the broadcast station and the
jammer are both coming from the same direction it won't help. However, it
should work quite well for nulling out other QRM such as hets, etc.
--
Tom Sevart N2UHC
Frontenac, KS
http://www.geocities.com/n2uhc
RHF
.
First - You could have did a Search the Rec.Radio.Shortwave
NewsGroup Message History/Archive ?
.
Search: 'anti' 'jamming' 'antenna'
RESULTS=> http://tinyurl.com/243mr
RFA-English <http://origin.rfaweb.org/front/sira/>
VOA-IBB <http://www.ibb.gov/engineering/antenna1.html>
Mike Villard [K3MT] <http://users.erols.com/k3mt/hla/hla.htm>
.
TOP Seach Listing "Sorted by Relevance"
.
Re: Anti-Jamming Shortwave Antenna System?
... Home Brew" Noise Canceling (Anti-Jamming) Antenna
This Antenna was Originally Designed as a simple and easy
to build Anti-Jamming Antenna for Radio Free ...
rec.radio.shortwave - Oct 26, 2002 by RHF - View Thread (8 articles)
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From: RHF (rhf-...@usa.com)
Subject: Re: Anti-Jamming Shortwave Antenna System?
Newsgroups: rec.radio.shortwave
Date: 2002-10-26 11:22:18 PST
.
Take a Look at this Hard-Core DX webpage.
"Antenna for Reducing SkyWave Interference"
Written by Dr. O. G. Villard, Jr.
http://www.hard-core-dx.com/nordicdx/antenna/special/reducin1.html
NOTE: This design is for ShortWave "SkyWave" Signal Reception.
.
This is from a prior posting to this NewsGroup.
"Home Brew Noise Canceling (Anti-Jamming) Antenna"
.
~ RHF
=QUOTE=
.
Howdy RHF:
.
Thanks for the link. The featured CTL (Coplanar-Twin-Loop) may be
one I haven't seen as of yet. However, there was one described on
the VOA/IBB website I looked at a couple of years ago.
.
This special and unusual antenna was designed by a heavy duty
research scientist at Stanford Research Institute by O.G. Villard.
If you want a paper to read with substantially more information
on the theory and construction of the antenna authored by the
inventor see the article in QST, 'The Coplanar-Twin-Loop Antenna'
September 1988, pages 29-35.
You can get reprints at ARRL Headquarters.
The paper claims a null depth on sky-wave (yes, that's sky-wave)
signals of around 20 dB.
.
There was a very nice write-up in WRTH describing different
models of the CTL plus construction details but the article
I have doesn't give a publication date. I suspect it was an
issue around 1989 or a couple of years after. It was the issue
that contained a review in 'Equipment Test Bench' on the Grundig
Yacht Boy 220.
.
I've seen references to the antenna in a couple of other
publications as well but I will have to search them out.
.
Do a search for the Coplanar-Twin-Loop' for more info.
You are right, It looks like a simple loop but it isn't.
.
Thanks, you got my interest up to try the CTL described in
the link---it will be awhile before I get to it though.
.
R.
.
= = = RHF <rhf-...@usa.com> wrote in message
= = = news:3ef6beca.02100...@posting.google.com...
.
"Home Brew" Noise Canceling (Anti-Jamming) Antenna
.
This Antenna was Originally Designed as a simple and easy to
build Anti-Jamming Antenna for Radio Free Europe Listeners.
They also Claimed that this Antenna should work with reducing
'man made' local noise.
.
http://origin.rfaweb.org/front/sira/
.
? Has anyone ever built this antenna and tried one of these
to reduce household noise?
.
? Anyone have any Reports of Successes in Helping to Eliminate
Noise around the shack?
.
~ RHF
.
=UN-QUOTE=
.
= = = al...@post.com (Ali N.) wrote in message >
= = = news:<51990af0.02102...@posting.google.com>...
>
> The latest issue of Monitoring Times makes reference to the
> following site:
>
> http://www.krsi.net/us-en/antijamming.asp
>
> which claims to present an 'anti-jamming' antenna for use by
> listeners of this > radio station who are located in Iran.
> The actual radio studios are apparently in California,
> broadcasting on 17510 KHz.
>
> Can somebody with a better knowledge of antennas and electronics
> explain the principle behind this design, and whether it will
> actually work!? Are there other types of 'anti-jamming' antennas
> around?
>
> Ali
= = = Dan Jacobson <jid...@jidanni.org> wrote in message
= = = news:<874qsol...@jidanni.org>...
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From: Radioguy (nos...@nospam.com)
Subject: Re: Mike Villard's Magic Anti-Jamming Antenna
for Shortwave Reception
Newsgroups: rec.radio.shortwave
Date: 2000-12-23 18:04:27 PST
.
Take a look at the Interference-Reducing Antenna For Shortwave
Broadcasts on the VOA/IBB WebSite:
[ Anti-Jamming Antenna ]
http://www.ibb.gov/engineering/antenna1.html
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Mike Villard's Magic Anti-Jamming Antenna for Shortwave Reception
.
K3MT's Villard Anti-Jamming antenna http://users.erols.com/k3mt/hla/hla.htm
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iane ~ RHF
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= = = From: Dan Jacobson (jid...@jidanni.org)
= = = Subject: anti-jamming antenna on Radio Free Asia website
= = = Newsgroups: rec.radio.shortwave, rec.radio.amateur.antenna
= = = Date: 2004-03-16 15:19:09 PST
.
Eric Oyen - N7ZZT
hmmmmmmmm.
looks like that isn't going to happen anytime soon. they have an English
page, but its all in BIG-% charset (Chinese).
DE N7ZZT
Phoenix, Arizona
--
the difference between intelligence and stupidity is that intelligence
has its limits.
Richard Harrison
"---apparently is a brilliant home brew anti-jamming antenna."
OK if the jammers all come from the same direction.; probably a rare
event. Jammer count on Radio Free Europe channels was at times 50 or
more per channel. Many operated right in population centers but these
didn`t go very far. Sky wave jammers must operate outside the skip zone
and must be far from the target area. A serious jammer likely has sky
wave transmitters in multiple locations.
In Europe, listeners in rural areas were outside local jammer range. In
early morning and early evening hours, reception of Radio Free Europe
was fairly good on some frequencies where propagation was good for RFE
to the target area but poor to the target area from Russia.. An
important news story or a really good joke would be on lips all over the
country almost immediately, carried into populated areas from the burbs
where reception was possible during the good hours.
The RFA advice to try another frequency is good to exploit the
propagation difference between desirred transmitter and jamming
transmitter, especilly during periods when propagation conditions are
changing.
More than one null in the reception pattern is probably needed to remove
serious jamming efforts.
Best regards, Richard Harrison, KB5WZI
Tom Bruhns
Here's a site with much better explanations and giving Villard credit
and kudos right up front: http://users.erols.com/k3mt/hla/hla.htm
RHF
= = = news:<pan.2004.03.17....@127.0.0.1>...
> On Wed, 17 Mar 2004 06:17:47 +0800, Dan Jacobson wrote:
>
> > http://www.rfa.org/front/sira/man.html
> > apparently is a brilliant home brew anti-jamming antenna.
URL Extension: 'man.html' = Mandarin (Chinese)
ENGLISH=> http://origin.rfaweb.org/front/sira/
This is the 'original' English Text Page.
.
.
> >
> > I asked them to make an English page along with the Chinese page, but
> > email failed.
> hmmmmmmmm.
> looks like that isn't going to happen anytime soon. they have an English
> page, but its all in BIG-% charset (Chinese).
The 'original' English Text Page is:
ENGLISH=> http://origin.rfaweb.org/front/sira/
.
.
>
> DE N7ZZT
> Phoenix, Arizona
iane ~ RHF
.
Jim Douglas
http://www.rfa.org/front/sira/
"Dan Jacobson" <jid...@jidanni.org> wrote in message
news:874qsol...@jidanni.org...
RHF
Mike Villard's "Noise Rejecting" Horizontal Loop Antenna (HLA)
- WebPage presented by Michael Toia [K3MT]
HLA=> http://users.erols.com/k3mt/hla/hla.htm
[ aka: Anti-Jamming Antenna ]
K3MT's STORY - Behind this WebPage about the "Noise Rejecting"
Horizontal Loop Antenna (HLA) [ aka: Anti-Jamming Antenna ] :
"Here's a neat little antenna for receiving on shortwave - that
is, HF - frequencies. It's the brainchild of Mike (aka Dr. O. G.)
Villard, Professor Emeritus of Stanford, founding father of
Stanford Research Instatute (SRI) Inc, and one of the most
wonderful colleagues with which it has been my sheer pleasure
to be associated. Mike had been asked by the Chief of U.S.
Information Agency, the parent of Voice of America, if there
might be some way to counter Soviet jamming of VOA broadcasts.
His mind set to work: he made a pile of different antennas that
seemed to show some promise, and presented a proposal to USIA to
produce two different anti-jam antennas that would be effective.
I was at VOA engineering. His proposal became a contract: by the
best of luck, engineering thrust me into the role of "ARCO" -
authorized rep of the contracting officer (all other government
agencies call this "COTR," but USIA is, well, different!)
Mike showed me myriad designs that filled his pool house to
the max! W selected two promising ones, and spent the rest of
the year studying them, improving them, and producing a really
neat end product. One counters jamming via sky wave, where the
jammer propagates by ordinary HF propagation. The other counters
ground wave jammers - noise transmitters located near the receiver,
usually on the outskirts of the city being jammed.
Ground wave jamming is exactly similar to arcing power lines or
other locally produced noise from appliances and the like -
even from lightning.
So, without further delay, I present, in picture form, . . . "
Mike Villard's "Noise Rejecting" Horizontal Loop Antenna (HLA)
HLA=> http://users.erols.com/k3mt/hla/hla.htm
[ aka: Anti-Jamming Antenna ]
iane ~ RHF
.
.
= = = rhf-say...@pacbell.net (RHF) wrote in message
= = = news:<ee137ed4.04031...@posting.google.com>...