[ARC5] Visual alignment connections

[Neil]

> It is a ramp (although not a very GOOD ramp), at about 30 Hz repetition 
> rate.
>
> I am using the sweep generator's ramp output to 1) sweep the signal 
> generator (FM it) to
> about 16 KHz wide, and 2) to sync the scope. 3) the scope is set up for 
> X-Y operation. The
> ramp is driving the X axis, and the output of the IF transformer is 
> coupled through an RF
> probe to the Y axis. The swept signal from the signal generator (FMed by 
> the ramp) is
> connected to the grid of the mixer tube.

So the signal generator is connected to the top cap (grid) of the 12K8. Fair 
enough, but the
12K8 local oscillator is running continuously and will be beating against 
your sig gen,
resulting in swept in-band and out-of-band signals.

The in-band signal will be heterodyned back to 1415 kHz, displaying as a 
phase-shifted
artifact seen in some of your photos. You really need to disable the 12K8 
oscillator.

73 de Neil ZL1ANM