Re: [Elecraft] Wanted: circuit diagram

[Stuart Rohre]

The standard circuit Ten Tec uses to test their noise blankers is a relay 
wired to open its own coil circuit and then remake.  The arcing at the 
contacts makes a good close by test source for this.

73,
Stuart
K5KVH 



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RE: [Elecraft] Wanted: circuit diagram

[Ron D'Eau Claire]

If your Hardware store stocks a simple buzzer or bell, they are the same
thing ready to go. Usually run off of 6 or 12 volts, ac or dc.

Why simulate the QRN with a solid-state circuit when the real thing is so
easy to produce? Hi!

Ron AC7AC

-Original Message-
The standard circuit Ten Tec uses to test their noise blankers is a relay 
wired to open its own coil circuit and then remake.  The arcing at the 
contacts makes a good close by test source for this.

73,
Stuart
K5KVH 

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Re: [Elecraft] Wanted: circuit diagram

[Don Brown]

Hi

I usually just scratch on the metal case of Q22 (the collector) with a 
screwdriver while holding it touching the metal shaft. This causes a random 
popping that the noise blanker handles nicely. You can switch the blanker on 
an off and here a big difference. If you want to build a pulse generator 
there are several circuits based on a LM555 that are easy to build. I think 
Radio Shack still sells 555's. Do a Googal search for National Semiconductor 
and down load the 555 data sheet. There should be several circuits listed

Don Brown






- Original Message - 
From: Karsten Eppert(DK4AS) [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Tuesday, February 07, 2006 11:51 AM
Subject: [Elecraft] Wanted: circuit diagram


 Hi folks,

 can anybody help me with a circuit diagram for a simple pulse-generator
 which I can use as test-generator in order to test the function of the
 KNB2? I figure 2 transistors will do, but can´t recall the rest.
 73
 Karsten
 DK4AS
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