30 Oct
2000
30 Oct
'00
9:12 a.m.
Dwight Elvey wrote:
"R. D. Davis" <rdd(a)smart.net> wrote:
It might be added here that I very much enjoy something called ARDF (Amateur
Radio Direction Finding.) The same techniques can be used to find such
devices rather easily :).
Didn't everyone build one of these, as well as AM and FM radio
transmitters for their own radio station, as a kid? The circuitry for
a TV jammer is very simple; just requires a few easily made inductors,
an RF transistor, antenna, resistors, caps, variable cap and batteries
(I used two 9V batteries in mine). The whole thing fit on a hand-made
PCB that was about 2" by 2" or less.
Hi
I saw an article that showed that one could put
two junction fets together in such a manner that
it made a negative resistance curve like a tunnel
diode. I did this and made a FM jammer. It used:
1 PFET
1 NFET
1 pot
1 coil
1 tuning cap
1 bypass cap
1 battery
I would think that a standard oscillator could be
done with less transistors but it would require more
total parts. I used to hate opera ( still do ). Most
of this was on FM. A few blanked out signals would eventually
cause the person listening to hunt for another channel.
FM goes completely quite when jammed, unlike AM that squeals.