[time-nuts] Re. DIY atomic "resonator"
Richard (Rick) Karlquist
richard at karlquist.com
Wed Apr 12 18:27:30 EDT 2017
Many decades ago, QST had an article about the
"Monode" RF noise generator. No it wasn't an
April Fools joke; the Monode is simply a light
bulb. You can probably download the article
from the arrl.org web site.
HP used to sell a fluorescent tube embedded in
a waveguide as a noise source.
These days, noise comm has a much easier
solution off the shelf.
On 4/12/2017 1:23 PM, Bob kb8tq wrote:
> *All* incandescent lamps emit RF ….. They are a resistive device that is heated to well above
> room temperature. People do use them in simple noise figure meters. The inductance of the
> filament in a typical bulb restricts the bandwidth a bit. The are designs from at least the 1960’s
> running around. I suspect the approach is much older and that’s just when I was introduced to
> the technique (= built one).
>> On Apr 12, 2017, at 2:18 PM, David <davidwhess at gmail.com> wrote:
>> Some incandescent lamps can emit RF.
>> On Tue, 11 Apr 2017 18:09:52 +0000, you wrote:
>>> Apparently fluorescent tubes continuously emit a lot of other microwave signals. I once built a homodyne doppler "speed" radar kit (used a coffee can for the antenna). The way you calibrated it was to point it at a florescent tube and and adjust the reading to a specific value.
>>>> Seems that some fluorescent tube starters do emit a very brief burst at around 1.4 GHz
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