New finds & the Woz! - test-drb@ccmp.vtda.org

30 Oct 2000

From: Dwight Elvey &lt;elvey(a)hal.com&gt;

...
  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: 

Over the years I've used...

    UV201  (old valve)
    6c4    (no nearly so old valve)
    2n170 (ge transistor FT about 30mhz)
    real tunnel diode (1n3117)
    hand picked diode with transistor (basic osc and comb generator)
        (generates uniform level rf carrier every 500khz through ~100mhz)
    Zener with 60db gain centered at 100mhz (very white noise!)
    My favorite 2n706 (Si NPN computer transistor) WIDE FM modulated with
        White noise source (zener followed with gain).
    pseudo random digial word driving PLL
        (every frequency possible on 50khz centers for an octave,
100-200mhz)

...
 I would think that a standard oscillator could be
done with less transistors but it would require more 

not many,  One fet, cap, coil, bypass cap, battery.

...
 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. 

AM squeals are avoided by being exactly on freq and holding that.  ;)

Allison