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NOISE GENERATOR for the HOME BREWERS

W0LEV All Messages By This Member #20228 The best ever ham radio publication, Ham Radio, once published a relatively simple project:? a "Gated Noise Source".? I built and extensively used one from MF, HF, VHF, UHF, and through 1296.? Search the Ham Radio archives and you'll locate it.? If you don't want the "gating" function, its even simpler. HINT:? Low voltage Zeners biassed just as the break into conduction produce the most noise.? You can select them using an o'scope of sufficient BW.? Or, better yet, your TinySA!? Be sure to decouple the bias from the SA. Dave - W?LEV
Richard Jamsek All Messages By This Member #20229 Hi Dave, There are two noise source articles in QST. January 1977 pp 22 "Gated Noise Source"?? May 1994 pp37 "Calibrated Noise Source" Is the January 1977 the article you are referring to? Regards, Richard? toggle quoted message Show quoted text On Fri, May 23, 2025, 1:56 PM W0LEV via <davearea51a=[email protected]> wrote: The best ever ham radio publication, Ham Radio, once published a relatively simple project:? a "Gated Noise Source".? I built and extensively used one from MF, HF, VHF, UHF, and through 1296.? Search the Ham Radio archives and you'll locate it.? If you don't want the "gating" function, its even simpler. HINT:? Low voltage Zeners biassed just as the break into conduction produce the most noise.? You can select them using an o'scope of sufficient BW.? Or, better yet, your TinySA!? Be sure to decouple the bias from the SA. Dave - W?LEV
W0LEV All Messages By This Member #20230 It was in HAM RADIO, not QST.? I noted that in the email.? Try the archives of HAM RADIO magazine. Dave - W?LEV toggle quoted message Show quoted text On Sat, May 24, 2025 at 12:12?AM Richard Jamsek via <K8cyk56=[email protected]> wrote: Hi Dave, There are two noise source articles in QST. January 1977 pp 22 "Gated Noise Source"?? May 1994 pp37 "Calibrated Noise Source" Is the January 1977 the article you are referring to? Regards, Richard? On Fri, May 23, 2025, 1:56 PM W0LEV via <davearea51a=[email protected]> wrote: The best ever ham radio publication, Ham Radio, once published a relatively simple project:? a "Gated Noise Source".? I built and extensively used one from MF, HF, VHF, UHF, and through 1296.? Search the Ham Radio archives and you'll locate it.? If you don't want the "gating" function, its even simpler. HINT:? Low voltage Zeners biassed just as the break into conduction produce the most noise.? You can select them using an o'scope of sufficient BW.? Or, better yet, your TinySA!? Be sure to decouple the bias from the SA. Dave - W?LEV -- Dave - W?LEV
Richard Jamsek All Messages By This Member #20232 David, I am aware that you stated Ham Radio. I've searched their archives as well as their cumulative indexes with no results. There are 269 Ham Radio editions in the index, from Feb 1968 to June 1990.? I then did a generic search using Ham Radio Magazine as the search topic, which came back with the QST articles. Richard? toggle quoted message Show quoted text On Fri, May 23, 2025, 6:17 PM W0LEV via <davearea51a=[email protected]> wrote: It was in HAM RADIO, not QST.? I noted that in the email.? Try the archives of HAM RADIO magazine. Dave - W?LEV On Sat, May 24, 2025 at 12:12?AM Richard Jamsek via <K8cyk56=[email protected]> wrote: Hi Dave, There are two noise source articles in QST. January 1977 pp 22 "Gated Noise Source"?? May 1994 pp37 "Calibrated Noise Source" Is the January 1977 the article you are referring to? Regards, Richard? On Fri, May 23, 2025, 1:56 PM W0LEV via <davearea51a=[email protected]> wrote: The best ever ham radio publication, Ham Radio, once published a relatively simple project:? a "Gated Noise Source".? I built and extensively used one from MF, HF, VHF, UHF, and through 1296.? Search the Ham Radio archives and you'll locate it.? If you don't want the "gating" function, its even simpler. HINT:? Low voltage Zeners biassed just as the break into conduction produce the most noise.? You can select them using an o'scope of sufficient BW.? Or, better yet, your TinySA!? Be sure to decouple the bias from the SA. Dave - W?LEV -- Dave - W?LEV
EI7JJB All Messages By This Member #20234 I recall a really simple noise generator circuit from a magazine (something like Practical Wireless, in the U.K.) in the 1970s which used a reverse biased green LED, two 9V batteries in series, a pot and one more fixed resistor. I built it at the time. You just tweaked the pot until you found the spot where the noise took off, it certainly worked up to the 2m band. I don’t have it or the schematic any more though sadly.
W0LEV All Messages By This Member #20245 I've always used Zeners as noiwe generators but have a collection of LEDS.? I'll have to give one or several LEDs a try! NoiseCom makes quite a line of noise diodes if you want something "standard" to build a noise source around.? ????????? Maybe I remember wrongly, but I could swear it was published in Ham Radio.? I do remember a QST article for a power meter much like the HP thermistor meters, that used a grain of wheat bulb as the sensing element.? But I had already built myself a power meter, mW range, using other technology.? Oh....OH......? This is straying from the TinySA intent of this group.? Please, Eric, it's good information for those who are considering a noise source. Dave - W?LEV toggle quoted message Show quoted text On Sat, May 24, 2025 at 8:06?AM andrew via <andrew=[email protected]> wrote: I recall a really simple noise generator circuit from a magazine (something like Practical Wireless, in the U.K.) in the 1970s which used a reverse biased green LED, two 9V batteries in series, a pot and one more fixed resistor. I built it at the time. You just tweaked the pot until you found the spot where the noise took off, it certainly worked up to the 2m band. I don’t have it or the schematic any more though sadly. -- Dave - W?LEV

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