Hi.

I did a mistake on doing my postings + pictures !

As you can see I built in a RF choke on a FT140-77 core inside the MFJ-935B
to suppress RFI on the outer shield of the coax cable. This was a mistake,
as the RF only can be blocked while RF of the inner AND OUTER (wire + shield)
has to go through the choke core.

But if you build in the core into the MFJ-935B case then you have one GND
connection at the input and another GND connection at the first variable
capacitor.
This means the RF on the shield (GND) can go around the FT core and still
can stray into the shield of the coax cable at the TRX socket !!


Solution:
--------------

You do NOT HAVE to build in a RF choke into the MFJ-935B case. Just remove
the single wire and replace it with a piece of coax cable, like RG58, RG213,
or like I did with AIRCELL-7.


! ! ! ! ! ! ! ! ! !
But put the RF choke on your OUTER coax cable to the TRX instead !!!!
! ! ! ! ! ! ! ! ! !

I use 2 RF chokes. One on the MFJ-935B side of the coax cable, another one
directly at the TRX side. This gives the best suppression on any circumstances.


Sorry for the faulty pictures. I will fix that in my future and official
modification sheet, of course.


Best 73,
Jochen (DG2IAQ)