[Lowfer] Amplifiers for 136 kHz

[Bill Ashlock]

John A,

> >One, a small high-efficiency switching amp located out in the
> > woods, just like I have now, but with TO-220 transistors (maybe
> > MJE15028/30?) mounted to a plate for heat sinking.
>
>Why handicap yourself by putting an amp out in the woods? Wouldn't >life be 
>simpler to keep the active stuff inside?
>
Haven't figured out a way to drive a 100ft coax with a square wave having an 
impedance near 0 ohms, unless I use a tuned circuit between the final and 
the coax to convert the output Z to 50 or 70 ohms. But that makes it two 
circuits to tune rather than one each time I want to change frequency. Any 
ideas?

Don't see too much of a handicap with an untuned final in the woods (well, 
not counting the loop tuning cap). Takes < 2 minutes each way to run out and 
bring in the final box to the bench to make alterations and then return it. 
I have a loop simulator coil and exciter simulator on the bench so there's 
no surprises when I re-connect it back to the loop and shack cables.

Bill

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