[SOC] QUESTION

[w7dra at juno.com]

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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