LF: Re: VE7TIL TX Loop tests continue.............

[Bill de Carle <ve2iq@magma.ca>]

At 09:58 AM 9/3/2010, I wrote:
> [..]
> One idea I am kicking around is to pass the 50-ohm signal at the 
> antenna connector through the centre of a toroid with a lot of turns 
> on the secondary - enough that we see millivolts instead of 
> microvolts.  Then I would do the clipping on the hi-Z side using a 
> couple of fast op-amps with a variable threshold setting, hoping the 
> hi-Z clipping gets reflected back thru the toroid to the 50 ohm 
> side.  Not good for HF but at 137 Khz it might work well enough.
Oops..  think it'd take 3 windings on the transformer: 50 ohms in, 50 
ohms out, plus a third winding to shunt excess energy to ground so it 
doesn't couple into the receiver.  I reserve the right to make more 
mistakes :-)
Bill VE2IQ