[ARC5] An "Extra Class" Question:

[Mike Everette]

Remember that big round device in the MD-7 modulator?  It's mounted in a clip, with black plastic caps on either side; it's connected across the secondary of the modulation transformer.  It is some sort of varistor.

Dave Stinson, or Mike Hanz, didn't you and I discuss this some time back, on or off list?  I forget (shame on me).  What are its properties?

Hmm, maybe this goes to prove that the old adage is true -- you can't leave the Command Set out of any good radio.  For any project to work properly, it must contain at least one part from a Command Set.

73

Mike
W4DSE


--- On Fri, 2/8/13, Peter Gottlieb <hpnpilot at gmail.com> wrote:

> From: Peter Gottlieb <hpnpilot at gmail.com>
> Subject: Re: [ARC5] An "Extra Class" Question:
> To: arc5 at mailman.qth.net
> Date: Friday, February 8, 2013, 7:16 PM
> Well, a MOV or Zener setup (back-back
> or one through a bridge) or some form of active clamp
> circuit using a IGBT.  Depends on how hard you want to
> limit, and if you want positive and negative voltages the
> same, and how precise and/or adjustable you want it.
> 
> Peter
> 
> 
> 
> On 2/8/2013 6:54 PM, David Stinson wrote:
> > I need to be more specific:
> > No modification of the original circuit beyond
> something
> > hung across the transformer secondary is permitted.
> > Mov?
> > There is a point to this- honest...
> >
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