[time-nuts] Double balanced mixer question

[cdelect at juno.com]

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