[time-nuts] Re. DIY atomic "resonator"

Bob kb8tq kb8tq at n1k.org
Wed Apr 12 16:23:57 EDT 2017


Hi


*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). 

Bob

> On Apr 12, 2017, at 2:18 PM, David <davidwhess at gmail.com> wrote:
> 
> Some incandescent lamps can emit RF.
> 
> http://www.rexophone.com/?p=1081
> http://www.radiomuseum.org/forum/rustika_lightbulb_fm_measurements.html
> 
> 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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