[Lowfer] RX Loop Tuning

[Bill Ashlock]

Jay/others,

I've been experimenting with my motorized trimmer cap over the last few days 
and it seems to be working fairly well. In review, this is a 2"x4" box 
containing a small Jameco gearmotor and 3/4" square compression mica that is 
located below the loop. (The gearmotor voltage is provided via the coax 
leadin).

Last night I changed the control box at the receiver so that the receiver is 
connected at all times - not disconnected when either UP or DOWN buttons are 
pressed. Used a couple of shockty diodes and 100 ohms of series resistance 
to protect the receiver's input (and ears). This appears to work fine.

Pictures and schematic to follow after a more thorough check. Next idea is 
to replace the push buttons with a 500 ohm pot connected to the + and - 
voltage sources. This will allow a slow motor rate for fine tuning and a 
fast rate for large frequency changes - IE: from 137k to 185k.

Bill





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