[GreenKeys] ST6 tuning scope circuit needed

[Lee Mushel]

Now you guys!   You're just not being fair!  Bringing up the Interrocitor
immediately took me back to a time 20 years ago when I was trying to teach
my son how to program a computer to control machinery  (PID) and we put
together a gadget that I immediately called the "interrocitor."   but I have
to disagree with calling such activity "1950's B movie."  When I came back
to ham radio after an absence of 25 years and got the teletype machines out
of storage the first thing I did was go on ebay to get every ham radio
cathode ray device they ever made and added those to the Squires Sanders
panadapter.   I always felt that the dovetron display was extremely
inadequate.  There is no substitute for a nice sharp green trace.

Lee   K9WRU
----- Original Message -----
From: "Jack" <wa2hwj at att.net>
To: <hunybuny at eskimo.com>; "Greenkeys RTTY" <greenkeys at mailman.qth.net>
Sent: Sunday, September 03, 2006 9:45 AM
Subject: RE: [GreenKeys] ST6 tuning scope circuit needed


> The ST-6 did not have a scope circuit. Irv later published
> a circuit using a couple of op-amps and extra toroids
> to give a sharper scope display (scope supplied by the
> builder). 1-inch scope tubes are hard to find, but
> the 2-inch (2AP1 or 902) variety is still available
> (try Fair Radio).
> Of course, you never know what you might find on Ebay.
> You can get a complete 5-inch oscilloscope for peanuts.
> Nothing like being able to tune in a RTTY signal
> from across the room! Witht hat 5-inch scope, your
> shack looks like somethig out of a 1950's "B" movie
> (remember the "Interrocitor"?).
>
> Millen sold a very nice 1-inch scope module that was
> similar to the one used in the ST6000 (but the ST6000
> scope module is not the Millen version).
>
> Many years ago a friend gave me a 1-inch scope tube he found
> in Radio Row in NYC. It had a schematic of the pinouts.
> I built my first RTTY tuning scope with it. It was
> mounted in an 8 3/4 rack panel because the power supply
> was so big! Unfortunately, it's long gone. Nowadays
> I build my scopes with 2-inch CRT's and a simple
> voltage doubler power supply to get the HV needed for a nice
> bright and clear display.
>
> In the golden days of RTTY there was a phrase:
> "RTTY'ers Build".
> That was because you couldn't get "store bought"
> RTTY terminals, etc.
>
> Of course, things have changed...
> But, some of us old-time "RTTY'ers [still] Build" because
> it's fun. A lot of the fun is just trying to find the parts!
>
>
>
> 73,
> Jack WA2HWJ
>
> NNNN
>
>
>
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