Hi,
(I would like a better photo of soldering side at the place of U6.) I have a large photo so I have to send it by email.
the shielding wire is connect to the ionic chamber
http://www.longrangelocators.com/for...&postcount=348
(
Up of the chamber are there 2 coils (rf chokes) or one with center tap???)I did not understand your question.
I do not have a signal generator.