[R-390] Twinax Antenna Input 390A

[Bryce Ringwood]

Hi,

There is a lot of earlier correspondence on this. I'm using a balun
(well, actually an 'unbal', I suppose) inside the IBM connector housing
(The twinax connector was used on old-style IBM networks and is readily
available, even here in South Africa). I think I'm using 20+20 turns,
bifilar wound on a small high frequency ferrite toroid, available in
many places. Take the opposite ends of the windings to make the centre
tap and connect the co-ax outer and ground. Take the coax centre to one
of the ends. Connect the two ends to the pins of the twinax connector. I
checked that the gadget was working with a signal generator and scope.
Look up 'balun' on Google.

A lot of the people prefer to use twin feeder as intended.

Enjoy, Bryce



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