[SOC] QUESTION

[Joseph B Cotton]

On Sun, Aug 26, 2018, 1:32 PM w7dra at juno.com <w7dra at juno.com> wrote:

> as i am busily re-engaging the state of the art receiver bought  for $30
> (1947 state of the art) to insert mysef back in the hard core  world of
> amateur radio contesting, i have decided to leave all my vibrators in the
> old coffee can  where they presently reside. can't even remember why i have
> those vibrators............... mike w7dra SOC#3895674069285E (i think)
> ---------- Original Message ----------
> From: "D.J.J. Ring, Jr." <n1ea at arrl.net>
> To: "Second Class Operators' Club" <soc at mailman.qth.net>
> Subject: Re: [SOC] QUESTION
> Date: Sun, 26 Aug 2018 13:19:38 -0400
>
> I can answer, if you're not addressing me.  I'm SOC, so I can jump into the
> QSO.
>
> The interrupters or choppers were made of a non-conductive wheel, like
> ebonite, hard rubber, anything that wouldn't break and was an insulation,
> on it, it would have strips of conductive material, usually copper.  They
> could also be done by a mechanical vibrator like the type that converted
> battery voltage to square wave AC to be transformed to higher voltage using
> transformers, then rectified at the higher voltage to be used as B plus
> voltage for receivers and transmitters - think WW2 era until the 1970s or
> so.
>
> I remember the Lafayette 460 six meter transceiver had a vibrator as well
> as the 6 watt (or so) Halicrafters 6 and 2 meter AM transceivers of that
> era.
>
> Step down and step up choppers are discussed here.  Instead of transforming
> voltage the CW chopper modulated the CW signal with square waves.
>
> https://www.electrical4u.com/chopper-dc-to-dc-converter/
>
> 73
> DR
>
> 73
>
> DR
>
>
>
> On Sun, Aug 26, 2018 at 1:10 PM <cptflak at foxinternet.com> wrote:
>
> > Dave, did they make those mcw gizmo's out of wood or plastic.
> >
> > Frank soc 1126
> >
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