[Milsurplus] Old CPUs

[Ray Chase]

Interesting, I've heard of that before, are there any MPN-1's in existance 
anywhere?
Ray
----- Original Message ----- 
From: "C.Whitaker" <whitaker at pa.net>
To: <milsurplus at mailman.qth.net>
Sent: Saturday, January 30, 2010 8:30 PM
Subject: Re: [Milsurplus] Old CPUs


> de WB2CPN
> Some Trivia:  You know why GCA sets, MPN-1's I know, precision tracking
> at about 9 Gigs, used a loooong section of wave guide between the 
> magnetron
> and the antenna waveguide switches?  Very high level engineering, those
> Gillfillian
> guys.   The magnetron was highly susceptible to frequency pulling if it
> encountered
> a reflected wave from the load.  The waveguide switch generated a lot of
> those,
> so, they just made the waveguide long enough that the magnetron finished
> firing
> before the reflected wave, (VSWR), arrived back from the antenna.  When 
> they
> improved magnetrons the extra waveguide was bypassed, but not removed.  In
> case you're wondering, that extra section fitted behind the precision
> horizontal
> antenna compartment.
> 73  Clete
>
>
>
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