[time-nuts] Double balanced mixer question

[Bob kb8tq]

Hi

Mixing those two frequencies *should* give you 10.000001 MHz and
1 Hz at equal levels. Any amplitude inequality will be due to filtering. 

Feed two tones like that into various amps and you will drive them into
compression. You need a good linear amp to handle both at once. 

Indeed some form of fancy filtering to prevent the 1 Hz from getting to the amp
is also an answer. The gotcah is that a narrowband filter likely will give you a 
bit of temperature dependent delay.

Bob

> On Jul 23, 2020, at 2:01 PM, cdelect at juno.com wrote:
> 
> Hi,
> 
> I'm feeding 5.0 MHZ and 5.000001MHz into an HP10514A mixer.
> 
> A buffer and a 12dB attenuator feed each input and a 50 Ohm buffer amp
> (10Mhz) is on the output.
> 
> I get a nice sine output but get the 1Hz as amplitude variations.
> 
> Playing with input levels I can minimize the variations but the best I
> can get is a 3.2 V P-P with a .4 V P-P amplitude modulation.
> 
> Are there mixer schemes I can use that will eliminate the amplitude
> variations?
> 
> Cheers,
> 
> Corby
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