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[HCDX] Chinese jamming your favorite shortwave radio station? - Try this anti-jamming antenna!
Please reply to zliangas@xxxxxxxxx
Chinese jamming your favorite shortwave radio station? - Try this anti-jamming
antenna!
http://www.pcjmedia.com/anti-jammng-antenna
Anti-Jamming Antenna PDF Print E-mail
If anyone can access this in an area where jamming is focused against broadcasters
like the Voice Of America, BBC World Service and others there is a quick and easy way
to get around this and improve your reception. These plans come from the Broadcasting
Board of Governors, which oversees the Voice Of America.
Last summer I built it myself to see the results and I was amazed. It really works
and does improve stations being jammed by the Chinese. Of course it does depend on
propagation, but it does work. It took me less than an hour to build and I used
stuff that I had around the house.
Materials:
A compact portable receiver radio with its telescoping whip antenna
An additional telescoping whip antenna similar to the one used with the receiver
radio or a stiff wire
Two pieces of aluminum foil having same width and length as those of the portable
radio receiver
A clean piece of plywood or equivalent, non conducting of electricity, big enough for
overall support
Two short pieces of connecting wire with screws for connection as required
A block of wood or equivalent to support the additional antenna
Installation:
On the piece of plywood used as overall support, lay the radio receiver on the first
aluminum foil pad. Use a rubber band or string to secure the receiver if desired.
Fix second antenna into wood block so it stays vertical.
Connect the additional telescoping whip or stiff wire to the foil pad on which the
radio lays. A small screw can be used to attach the first connecting wire to the
aluminum foil.
Wrap the other bare end of the wire around the whip and twist the wire to assure that
a good electrical contact with the whip is established.
Use the second wire to connect the remaining aluminum foil to the telescopic whip of
the receiver as described above.
Operation:
The interference reducing antenna should be operated in a relatively clear area. It
works best when people are not near the antenna.
The interference reducing antenna is operated by rotating the whole system, receiver
and the two whip antennas together with the plywood support, until the interfering
signal is minimized and the desired program is as clear as possible.
If the desired program cannot be received clearly by rotating the plywood support
when the interference reducing antenna is level, then try slanting each of the
antenna whips or both, and then rotating the system again. Keep experimenting with
different slants and rotations combinations until the desired program clears.
http://delicious.com/gr_greek1/zak (all my pages )
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THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed
and/or modified under the conditions set down in the Design Science License
published by Michael Stutz at
http://www.gnu.org/licenses/dsl.html