[time-nuts] Zeeman Audio Source?

[Brooke Clarke]

Hi Chuck:

My first thought was a transformer, but I did the math and don't see how 
it can work.
An amplifier sure will and that's probably the most inexpensive way.

Have Fun,

Brooke

Chuck Harris wrote:

> Hi Brooke,
>
> It shouldn't be that hard for you to get 1 Vrms into 50 ohms, it is only
> 20mW.  Your HP204 is designed to drive 600 ohms, so it would like a tiny
> little transformer to match it down to 50 ohms, or even close.
>
> Or, you could make yourself an emitter follower using most any small
> NPN transistor.  Or any modern opamp...  Amplitude accuracy isn't 
> important
> here.  (frequency is, though)  I use an HP3336B synthesizer's 75 ohm
> output to drive mine.
>
> -Chuck Harris
>
> Brooke Clarke wrote:
>
>> Hi:
>>
>> I tried to use my HP 204B audio source for the Zeeman test, but 
>> although it puts out over 5 volts RMS into an open circuit, the 
>> voltage across the 50 Ohm FTS4060 Zeeman input is only 0.33 Volts, 
>> not the 1 Volt needed.  Can someone recommend an audio generator, 
>> hopefully available for a reasonable price somewhere?
>>
>> The HP manual says the frequency should be 42.82 kHz for zero 
>> offset.  There is a table listing a number of other frequencies that 
>> give different offsets.  This was back in the days when a second got 
>> a new definition each year, hence the different offsets, but today 
>> zero offset is the standard.
>>
>> Have Fun,
>>
>> Brooke Clarke, N6GCE
>
>
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