On Mon, 24 Mar 2008 04:32:39 -0700 (PDT), Artem
wrote:

I've observed that, and I have observed it is not enough from your
photo - if you still have self-oscillation. Your pictures do not
reveal any choking of the RF Out cable.

It's inside. Nearby BNC socket.

Which defeats the choking.

As for the diagonal arm for "ground." This is fine insofar as it
being placed in the electrical middle of the antenna loop (a ground),
but all this rat's nest of wiring throws the concept of balance out
the window.

I think that some disbalance should compensate differencial amplifier
on transistors.

That makes no sense whatever.

another invitation to problems when a 9V battery would
solve that too. Local power would discard the need for the ground

Yes. But FETs draw more that 10ma each.

That is trivial. However, you can bias for less because you don't
need that much drain current.

coming from the loop's perimeter, eliminate unnecessary AGC, reduce
the complexity of choking, lower gain (it obviously has too much), and
give you only one coax coming from the antenna.

Cable length is not problem. I'm living in apartment. I can put
antenna outside the window. But not on the roof.

I can make power supply over coax cable. I can put Atmega8 (en
example) to amplifier and add DACs for operate varicaps, AGC. I can
add rectifier and filter for detect self-oscillation and automatics
reduce AGC. But it's not necessary.

Sounds like a lot of unnecessary complexity. The one thing you repeat
is varicaps, but I don't see them.

73's
Richard Clark, KB7QHC