[ARC5] Visual alignment connections

[Kenneth G. Gordon]

On 24 May 2013 at 20:09, Neil wrote:

> So the signal generator is connected to the top cap (grid) of the
> 12K8?

Yes.

> 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.

OK. I see what you mean and that is definitely a possibility. 

On the other hand, not one single one of my many references to this method 
even mention the HFO at all, let alone disabling it.

> 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.

OK. To test this idea isn't difficult: all I have to do is remove the HFO coil, 
which in these receivers, plugs in.

On the other hand, why does my method of removing the detector tube and 
connecting to the last IF output work as it does? The HFO is still running in 
that case.

Ken W7EKB