Ring vs BCD counters for decades

schwepes at moog.netaxs.com schwepes at moog.netaxs.com
Sun Aug 31 12:44:04 CDT 2008

The system I worked on much later used two frequencies and the
resulting intermods for ranging information and that was mixed
with the direction of the tracking radar.  This was an
analogue system using synchros (remember Waldo?) to position
the weapon, in this case a missile, in the position that the
boogie would be in.
The first Navy fire control computer was definitely analogue.

On Sat, 30 Aug 2008, Brent Hilpert wrote:

> William Donzelli wrote:
> > Ranging. For fire control, very accurate ranging is very important, as
> > it is one of the biggest variables in ballistics equations. Getting
> > accurate range data out of the radars was thus extremely important, so
> > the range circuits were very precise, and often employed dividers and
> > flip flops and such to generate cursor information on the scopes for
> > the operators.
> Interesting, I didn't know they had gotten that complex with the WWII stuff.
> Offhand I would have thought they would have used capacitor / pulse-interval
> integration techniques for such calculations in that era rather than digital
> counters. Not accurate enough perhaps.
> (I do have a picture somewhere from WWII of my dad on a Wehrmacht anti-aircraft
> gun that he said was automatically ranged and targetted by radar.)

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