[GreenKeys] Nice old picture

[Roy Morgan]

On Feb 11, 2016, at 12:25 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> As I recall there was also an adjustment procedure that involved holding
> down the space bar and measuring the time to space across a line, as an
> alternative to using the tuning fork.
> 
> And an aside to that, some military stuff allows for taking a bias
> reading using the space bar held down.  This doesn't produce a zero
> average signal, but the zero-center meter circuit is intentionally biased
> to read zero when the bias is zero and the space bar is held down.

Jim,

OI have a military (Army) field line unit that has a meter, an adjustment pot, a line relay, and terminals.  Is this the thing that has the meter circuit intentionally biased as you mention?

I’m pretty sure it’s called the "BE-77 Line Unit”.

Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958