[time-nuts] noise sources Re: Re. DIY atomic "resonator"

Bob kb8tq kb8tq at n1k.org
Thu Apr 13 09:09:51 EDT 2017


You likely would get more noise density out of the NE-2 than the incandescent bulb. The
advantage of the incandescent is that you can estimate the temperature fairly accurately 
and thus come up with the noise by calculation. We did the build as part of a radio club 
meeting back in the 60’s. I was still in high school and will not in any way claim I followed
the zigs and zags of the physics between the various candidate sources as that was all presented. 
My only focus was on “what goes where to make it work” :) 


> On Apr 12, 2017, at 11:16 PM, jimlux <jimlux at earthlink.net> wrote:
> On 4/12/17 6:33 PM, Bob kb8tq wrote:
>> Hi
>> Back in the day (1960’s) noise diodes were quite a bit more expensive than they are today. Even
>> today, a miniature lightbulb is quite a bit less expensive than a noise diode. You don’t go that way
>> because it’s better. You go that way because it’s cheap ….
> yeah, but I'd think something like a NE2 might be better, but maybe the noise properties of a glow discharge aren't as good.
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