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- Msg : 36 of 200
- From : user@lostinthe.net 1:340/13 03 May 96 09:32:12
- To : All 03 May 96 19:06:50
- Subj : Re: Wanted: Plans for Spark Transmitter
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- From: user@lostinthe.net
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- au@ix.netcom.com(au) wrote:
-
-
- >Hi there,
-
- >I'm looking for plans for a spark transmitter for the CB band. I need
- >at least a 1000 watt unit.
-
- >Thank you,
-
- >au
-
- I think you need to do some research on what a spark transmitter is
- and how it works... A spark transmitter is a VERY broad band thing.
- You can NOT tune it to a specific channel, nor can you control it's
- bandwidth. A spark transmitter with an antenna tuned to 11 meters
- would probably wipe out everything from 10-40MHz. Spark transmitters
- have been illegal since around 1940something because all they do is
- cause great amounts if interference. If all you wanna do is jam
- communications, then a spark transmitter is for you- but take heed,
- you'll have EVERY HAM operator within 30 miles of you hunting you
- down, and the HAMS will have help from all the local radio and
- television stations. The FCC will be very interested, as a spark
- transmitter is considered "Willful and harmful intereference to
- licenced and approved communications."
-
- Now- to build one, you need a neon sign transformer, some heavily
- insulated wire, like teevee picture tube high voltage wire. Use a
- switch in the AC line side of the transformer. Ground the metal case
- of the transformer with 10 gauge or larger wire. Make sure it's a
- ground rod ground or good cold water pipe ground. Use the hi voltage
- wire to lead from the insulated high voltage terminal to your antenna.
- Make sure your antenna wire is well off the ground because anyone
- touching it will be fried. Your antenna needs to be 1/4 wavelength of
- the frequency you want to radiate most of your signal on.. Now for
- the actual spark gap- I have found a piece of coat hanger wire
- attavhed to a ground screw on the transformer case and bent to leave
- the end of the coat hanger wire 1 inch or so from the insulated high
- voltage terminal works well. Turn on the power switch and check your
- spark. It should be nice and blue-white. Turn the power off and bend
- the coat hanger wire so it's closer or further from the terminal until
- you get a good fat spark that comes on immediately when you apply
- power. Have fun causing intereference. (BTW- a good neon sign xfmr
- will radiate a couple hundred watts. An oil fired furnace has an
- ignition transformer which is real similar to a neon sign transformer,
- but a little more power. )
-
-
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