<<<SPAM>: Re: [R-390] Anyone Know about this FSK device & Value?

[Tim Shoppa]

Roy Morgan wrote:

> As you can see, it is a tube- and mass- intensive device. The 115 is about 
> all I want to lift at one time.  And apparently they really DO need all 
> those fans.

What's inside a CV-115?  I did some RTTY stuff with surplus Bell datasets,
and they were maybe a dozen transistors with some big inductors for LC
filtering of mark and space.  There was a not-small power supply for 60mA current loop
but even then it wasn't all that big.  I could imagine doing all that with a half-dozen
12AU7's.  (In fact, I think the 1960's ARRL handbook did it that way using surplus
telco inductors).  So what's all that mass for, espcecially if as you surmise it
was actually a slope converter?

Tim.