[FoxHunt] active attenuator

[Brian Mileshosky]

Hi All,

	Another excellent active attenuator was designed by Jerry Boyd
WB8WFK of the Albuquerque Transmitter Hunters.  It includes a field
strength meter, so when your active attenuator tops out (which it has
never done to me...even inches away from the antenna running about 5
watts), your active attenuator will take you the rest of the way.  An
awesome design.

	The info and plans can be found at http://home.att.net/~wb8wfk/.
Stay tuned, too, cause our website will be updated shortly!

73,
Brian, N5ZGT
Albuquerque, NM

On Mon, 25 Mar 2002, John Munsey wrote:

> Mike, I would like the details for this project.  Also, if you can send it
> to me in completed form I have access to Acrobat and could get it put in
> PDF format so that it would be easy to post and/or email to others.
> 
> Thanks for the good work.
> 
> At 07:09 PM 3/24/2002 -0800, you wrote:
> >
> >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?
> >
> >_______________________________________________
> >FoxHunt mailing list
> >FoxHunt@mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/foxhunt
> >
> John Munsey,  KB3GK
> Ormond Beach, FL 32174
> 
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