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Build a Repeater Bug/Repeater Jammer!
your own repeater bug, or repeater jammer, with our help and advice!
Find your target repeater with the Grid Reference
You can target
your own local repeater, or make a device with variable frequencies that you can
use on your travels, now that prices of hand held transceivers are falling, especially
second hand ones.
Not a great deal of practical knowledge of electronics is
required to construct a device, but you will need the basic skills of soldering
and drilling etc. Don't be too ambitious at first though, our advice is to keep it simple.
We have made 2 distinct types of device, the simple ones, such
as "Tony Toneburst", and the more advanced ones with music, messages, and digital
Equipment / Transmitters
Wood & Douglas
144FM2T3 transmitter board. As you can see, it is quite small, but compared with some of today's transmitter boards with
surface mounted components, it is huge!
This is the
FM6, it is TINY and ours transmits 30 miles and accesses a
repeater on a ¼ wave length of wire just as shown! The picture shows the top of
the board, the components are surface mounted beneath. Shown in this picture are
the battery (top), a standard crystal (centre) and a microphone (bottom left). A
good feature is that this transmitter works with a mere 6 Volts.
Here is another variation of the FM6, this one was produced by
in the States, but sadly they have gone out of business
leaving us with only 3 of these wonderful transmitters. As you can see, this one
is crystalled for 145.025MHz, and has given sterling service in the past. We had
to remove it from a device to take this picture.
This is the
smallest crystal controlled transmitter we have found, and by far the best. This one worked well in
tests, although its use has been limited to a radio rally "talk in"
frequency. Fitted inside a packet of 20 cigarettes with a laughing module and 4
AA batteries, it was carried around inside a radio rally by an unsuspecting
person while we monitored the effect from outside. It is rock solid on
frequency, and powerful for its size. For the test we used a loosely coiled ¼
wave wire inside the cigarette pack. It completely obliterated all signals due
to its close proximity. This picture shows it before the crystal was changed,
and the microphone replaced with a sound module.
To convert any of these type of crystal controlled transmitters for repeater bug use, the
crystal needs to be replaced. New crystals are available from :-
PO Box 19
Phone 01322 330830
Fax 01322 334904
To work out the frequency required, a little simple maths is required. Assuming you know the
frequency the unit is currently set to transmit on, (if you don't, a scanner will give an approximation) and divide INTO
this figure the currently fitted crystal frequency. This will give you the
MULTIPLIER, quite often 12.
For example, if the transmitter is set for 169MHz at present and
the crystal has 14.08333 stamped on it, then the multiplier is
12. (14.0833 X 12 = 168.9996, the Tx frequency)
For Example:- To convert it
to transmit on 145.025, the input frequency of a repeater on 145.625Mhz,
divide 145.025 by 12 to get the crystal frequency, order a crystal on 12.0854. It's that simple. To ensure the
correct type of crystal is supplied, we suggest unsoldering, and sending the old
one with the order, that's what we always do.
For some very good transmitter kits and other interesting things:-
Their FHT1 "foxhunt" transmitter, for
US$89.95 had definite
possibilities and it is microprocessor controlled with variable time delays etc.
It represented excellent value and should have done the job well with only minimal modifications.
Sadly no longer available from the manufacturers, although you may find one
if you search.
Download our simple resistor colour code
a website for the hobbyists, like the majority of
LPWS members, there are interesting projects and loads
of modifications for existing kits. OK, not all radio
related, but some interesting things just the same. Look
in the TECHNOLOGY section.
Instructables, we have just made one of
these TV-B-Gone devices a mere US$19.95 kit.
Great fun when
such places as Comet and Currys, also in department stores, be
careful in pubs though if there are any
morons watching football! Plunges John Lewis
and Selfridges into silence!
A good 25
metre range, sometimes up to 50 metres. The
small EPROM contains a list of "off" codes
for nearly all brands of TV, pressing the
button starts it scrolling through the list
with Samsung, Panasonic, Sony & LG coming at
the begining. Another press starts the
sequence again, the whole list takes about a
minute to finish.
(A side effect
of this device is that it will turn on any
set that is already off though.)
range IR diodes and 2 wide dispersal diodes,
can be modified to take a matrix of 24!
A good source of circuits for
hobbyists can be found