[FoxHunt] active atten

[Michael J. Miller]

I have developed an 'improved' active attenuator for our local club.
It is simple to build, using one CMOS IC, a crystal, single diode mixer and a pot.
The improvement is mainly the addition of a 2 Hz oscillator gating the 1 MHz
oscillator.  This really helps to distinguish between an unmodulated signal and the
noise floor in an FM receiver.

I could post it if there is much interest.

Mike
WB6TMH


> >de Rick K5RIC wrote:

>
> >Does anyone have any circuit updates to the Active Attenuator circuit from the
> >one in 11/92 QST? Im going to give this a try soon. Has anyone tried different
> >type diodes, or even used a double balanced mixer such as an SBL(over kill?). I
> >would also think you could use a different style oscillator such as a 74C04 and
> >a 500 K or 1M ceramic resonator. Any thoughts?