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RF Broadband Noise Generator

 
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RF Broadband Noise Generator
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The Dude
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Post RF Broadband Noise Generator Reply with quote
I would appreciate it if anyone could tell me where I could find a simple RF Broadband Noise Generator circuit with Zener diode. I am looking for the kind that uses about half a dozen parts with parts values listed!

Thanks.
Thu Jul 31, 2003 3:56 pm
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Post Reply with quote
Bohr, Niels Henrik David (1885-1962)
An expert is a man who has made all the mistakes, which can be made, in a very
narrow field.
Tue Oct 07, 2003 10:12 am
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Post Reply with quote
That was a strange answer!
Tue Oct 07, 2003 11:39 am
pcs
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
Noise generator to be used for what?

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Tue Oct 07, 2003 12:26 pm View user's profile Send private message Visit poster's website
R_QRP
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Joined: 01 Oct 2003
Posts: 30

Post Reply with quote
A noise bridge is a device for measuring or comparing impedances on coaxial cables, antennas, components, etc. With appropriate calibration, it allows for the measurement of both scalar and vector (reactive) impedances. A noise bridge contains a wideband noise generator as well as a bridge balancing circuit, and makes use of the station receiver, tuned to the frequency of measurement, as a detector. The bridge is balanced by changing a bridge capacitor and resistor while listening to the receiver for a noise null. Resistance and reactive values can be determined from the variable R and C positions, and may be converted to an SWR or Z value. The noise bridge may lack the precision of a laboratory instrument; however, it has sufficient capability for normal amateur use and can perform many of the measurements of more expensive instruments such as antenna analyzers.
Tue Oct 07, 2003 2:28 pm View user's profile Send private message Visit poster's website
StormiNorm
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Post Well geez i be GDAMN how informative Reply with quote
R_QRP wrote:
A noise bridge is a device for measuring or comparing impedances on coaxial cables, antennas, components, etc. With appropriate calibration, it allows for the measurement of both scalar and vector (reactive) impedances. A noise bridge contains a wideband noise generator as well as a bridge balancing circuit, and makes use of the station receiver, tuned to the frequency of measurement, as a detector. The bridge is balanced by changing a bridge capacitor and resistor while listening to the receiver for a noise null. Resistance and reactive values can be determined from the variable R and C positions, and may be converted to an SWR or Z value. The noise bridge may lack the precision of a laboratory instrument; however, it has sufficient capability for normal amateur use and can perform many of the measurements of more expensive instruments such as antenna analyzers.


Greetings,
Well Miracles never cease to happen...I never had the foggiest idea that after all these yEARS OF MY USEING SERVICE MONITORS MADE BY MOTOROLA AND WAVETEK WITH TIME DOMAIN REFLECTION ANALYSIS CAPABILITIES THAT I COULD HAVE SIMPLIFIED ALL THOSE HIGH TECH. RESULTS OBTAINED IN ABOUT 3MINS OF SETTING UP A MENU FUNCTION DISPLAY AND PRESSING A FEW BUTTONS THAT SIMILIAR RESULTS OBTAINED COULD HAVE BEEN ACCOMPLISHED WITH A NOISE BRIDGE...HOW LONG WOULD IT TAKE TO VERIFY SUCH MEASUREMENTS USEING SUCH A SETUP GUYS??? I AM RATHER CURIOUS.

Respects Norm B
Wed Oct 08, 2003 12:53 am
StormiNorm
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Post Oh really Reply with quote
Anonymous wrote:
That was a strange answer!


It takes another strange being to be able to decode the strange answers..Ha!
Wed Oct 08, 2003 8:14 pm
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Post Reply with quote
Broadband noise generators have been around for a long time. If you're not familiar with them, you're going to be amazed at how simple they are to build, and how useful they can be around the shack, especially when used in conjunction with some recently available (but very sophisicated) software for PCs.
Wed Oct 08, 2003 8:50 pm
StormiNorm
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Post oh really Reply with quote
Some folks i know would say **** that noise
Thu Oct 09, 2003 4:44 am
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Post Reply with quote
Hm, avoid to act like broadband noise generator!
Thu Oct 09, 2003 3:21 pm
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Post On the Record Reply with quote
SHUT UP!
Fri Oct 10, 2003 3:55 am
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Post Reply with quote
Broadband noise generators have a little switch
in the front that could be set ON or OFF. Very useful.
Fri Oct 10, 2003 10:26 am
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Post Reply with quote
Anonymous wrote:
Broadband noise generators have a little switch
in the front that could be set ON or OFF. Very useful.


Think about this

(((I cannot judge my work while I am doing it. I have to do as painters do, stand
back and view it from a distance, but not too great a distance. How great?
Guess?)))

(((Carmichael, R. D.
A thing
==============

I hope that posterity will judge me kindly, not only as to the things which I
have explained, but also to those which I have intentionally omitted so as to
leave to others the pleasure of discovery.)))

Respects..Norm B
Sun Oct 12, 2003 9:23 am
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