[Milsurplus] BC-9: Is It Halloween??

[David Stinson]

The story just gets bee-zarr-er and be-zarr-er.

I put the loop together and operated it both
outdoors in the clear and on my kitchen table.
The "normal"  4 MC loop is about 12 ft in total
length.  To get the rig down to 80 CW takes
just slightly over 15 ft.  Ouch.  
https://goo.gl/photos/tyJBJkt7LMp2p19E8

Operating the loop in the open or on the 
table- proximity to "stuff" on the table changed
the frequency, but not the shift.  Loop or 
tank-link, the shift remains constant if one uses
the same tube between the two states.

Neil, I thinik you may be "on to something"
with the power supply.  I am using a 12 volt
supply feeding isolated-output DC converters.
If I just connect them directly without any 
bypassing or chokes, the transmitter will
shift 20 KCs.  I installed 3mH in the -120V
line and with that, I can get the shift down
to 3-4 KC when using an 01A or the 6AQ5.
With the loop, even a VT-25 a filament volt
short will regen.  

Now here is where it gets "Halloween." 
If I install 3 mH in the +120V lead,
it INCREASES the shift to 7KC.  
So I left it out.  But wait; that's not all!
If I include the 3mH choke in the -120V
lead, it decreases receiver sensitivity severely.
Huh?  Yep.... Sure does.  Short it out and 
signals 20 KCs away from the transmitter
are just excellent.  Put it back in circuit
and received signals get puny.
I keep waiting from some hobgoblin
to jump out of this thing, laugh at me 
and then go infest one of my future
projects.  "Weird" just doesn't say it.

Hue, you may have the straight of it.
Maybe it never did work "right."
I dunno.   I need to find a way to 
build a 120 V battery pack good for testing.

I'm tired.  Been painting the house all day.
Will "hit it another lick" later.
Take care, all,
Dave S.