The summary from emails is:

1: Fet will be overloaded and generate lots of intermodulation.
2: I have to choose the fet very carefully (I have thousands to select
through).
3: Need bandpass filters.

I think I still to build a box and give it a test.

Won't take much time.

Steve.

(Jim) writes:

steven, i dont know the answer to your question but i am sure that if
you show us the details on your JFET in a box gadget then several of us
will run to build one. lots of testing will follow with much discussion
and maybe even a flamefest! lots of fun will be had by all.

--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA