[Antennas] Cushcraft MA5B

[Alan C. Zack]

I wonder if anyone would have any info on the MA5B matching box MN5B.  Is
this a transformer/balun type of device?
The reason I'm asking is the received signals on my MA5B are very weak,
much weaker than what I hear on my R-7000 when I switch between antennas. 
Also, the SWR is high.  I first suspected my coax, but a second, new run of
coax shows the same results.  In checking the MN5B matching box I show an
open between the center conductor and outer conductor of the coax connector
on the MN5B.  If there is a transformer or balun involved, such as in the
R-7000 matching unit, then I should have continuity, as I show in the
R-7000 box.
I wonder if anyone has knowledge or experience of what is inside the MA5B
MN5B matching network black box.
TIA & 73
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