Loop Antenna broadband amp

[Chuck Olson]

I've been searching for some hints as to what may be in the resin-encased
amplifier used on the Wellbrook loops without much luck. Their power demand
of 130 mA at 12 volts is kind of high for any FET diff-amp, PNP level shift,
into a balanced to unbalance output transformer arrangement. I'm using that
configuration right now on a tuned loop that only requires 17 mA at 9 volts.
Any ideas or links to useful information?

Thanks,

Chuck

 

[amdx]

"Chuck Olson" <chuckolson01@REMOVETHIScomcast.net> wrote in message
news:BNWdnWf9na7SNrXfRVn-vw@comcast.com...

I've been searching for some hints as to what may be in the resin-encased
amplifier used on the Wellbrook loops without much luck. Their power
demand
of 130 mA at 12 volts is kind of high for any FET diff-amp, PNP level
shift,
into a balanced to unbalance output transformer arrangement. I'm using
that
configuration right now on a tuned loop that only requires 17 mA at 9
volts.
Any ideas or links to useful information?

Thanks,

Hi Chuck,

The (lossless feedback amplifiers) draw high current, but
of the two I have one draws about 70ma and the other around 100 ma.
See http://www.arrl.org/files/ard/rf_7-96.pdf
This one is set at 60ma (push/pull)
Mike