[HomeBrew] Help!

Fri, 21 Feb 2003 12:50:24 -0800

There is always KISS... a buzzer and a flashlight battery. I have seen it
work. Good luck.

Ed Richards

On Fri, 21 Feb 2003 19:51:09 +0000 "Durwydd MacTara"
<[email protected]> writes:
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> 
>                   Broadband "hash" generator
> I want to build one that will create noise at least through 30 MHz 
> with no 
> more than a few mw of power output. I want to use as few components 
> as 
> possible because I want to mount it inside my antenna tuner cabinet, 
> leaving 
> it on all time; the idea being to adjust the tuner for a null in the 
> 
> increased noise floor on the "guess meter" of my receiver, thereby 
> tuning my 
> antenna with no qrm caused by me! I see a minor problem in coupling 
> the 
> noise to the reieever without coupling excessive RF back into the 
> generator 
> when I put my 100 watt transceiver into transmit! this possibly 
> could be 
> solved with a relay. I initally plan to power this circuit from the 
> power to 
> the meter lamps for the tuner. the other possible power source is a 
> +12V 
> receive line from my Kenwood TS-830 however I would rather not.
> 
> My first thought is a couple of ttl nand gates wired as inverters 
> and daisy 
> chained in a loop. As I recall this configuration will oscillate at 
> about 10 
> KHz with a "nasty" square wave, loaded with harmonics.
> 
> A second idea is to use a zener diode as a broadband noise generator 
> and 
> feed the noise to a couple of 2M2222 transistors for amps.
> 
> PLEASE folks, I am open to any and all ideas?
>   "Communications" is a People skill, the rest is technology.
>              Durwydd MacTara
> 
> 
> 
> 
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