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[Discuss-gnuradio] dual-gate mosfet front end - results

From: Chuck Swiger
Subject: [Discuss-gnuradio] dual-gate mosfet front end - results
Date: Mon, 07 Mar 2005 12:36:57 -0500

Gang - just for the record this front end:


works at least as good as, if not better than the MPF102 version (but w/o the
tuned input, just using a capacitance coupling to the antenna and 1.5Mohm from
gate to gnd). Using a long random wire, tuner, the above circuit, a passive bandpass
filter then the usrp, I get this spectrum:


the overall peak around 3.9mhz is largely a function of the tuner, easily moved
wherever you want. While watching the spectrum, recorded around sunset Mar. 6,
it's easy to see something 'sweeping' the band every so often. Also there's
a curious emission just under 4Mhz, a wide block of hiss from 3995 to 4000k.
In audio it's just a hiss. Any guesses? Amateur DRM?


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