[Lowfer] TH and HS

[Bill Ashlock]

John,

>No. I'm only using a 1 to 2 turns ratio right now. That has provided 
> >enough signal.

And I wouldn't want you to gain an even bigger reception advantage over us 
mortals. <G>

>I'm planning to add a motor driven variable cap to bridge the
>gaps between the switched capacitor steps. This will allow me to raise >the 
>turns ratio and extract more of the available signal.

This is where I'm confused. Wouldn't increasing the step-up ratio actually 
reduce the Q since the R seen by the loop would be lower? But this is a 
series circuit...... Hmmm. I'll have to work this out on paper.

Looks like one of the biggest objectives to successful RX looping is to come 
up with a simple remote-tuned 1000pf(+) variable capacitor. I don't trust 
those tuning diodes in my high-noise environment. They seem to sensitive to 
out of band noise and modulate the desired signal. This new loop without 
diode tuning or pre-amp is the first loop I've used that is almost dead 
quiet when I tune the receiver off to the side of the loop resonant point. 
(And the Q is no higher than the others) I suppose one of my big compression 
mica timmers could be motor-driven with a compact gear reduction unit.

Bill



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