[R-390] Twinax From IBM Used

[Flowertime01 at wmconnect.com]

Fellows,

The IBM twinax connectors go onto the R390 antenna relay just fine.
I have been using them for years. The Twinax coax works fine also.

You can ground one of the conductors and feed the other conductor from
the antenna. If you have some ferrite that covers the frequency range you 
like, you can wind a simple balun to provide a balanced input to the R390 from 
the antenna. If you have a balanced line or balanced antenna match the twinax 
can be feed from that device. 

If you are going to have to buy some coax, buy enough twinax to get you 
outside the shack. Buy a couple Twinax feed through of cable splice connectors. Run 
the twinax from the receiver to outside the shack. Place the matching device 
outside in a weather sealed container and ground the outer shield of the 
twinax outside.

This works to keep shack noise out of the R390 antenna. It made a world of 
difference for me in my San Diego California garage with all my computer stuff 
running.

You can find the twinax as IBM token ring cable as used stuff. It is 
recognized as good coax worth saving and just wondering what to use it for. The heavy 
duty serious computer support places may have several lengths collecting dust 
complete with connectors. A right angle adapter is also useful if one is to be 
had.

Just ask for the IBM token ring cable and connectors. Skip the Radio part. 
The computer Geeks do not understand radio.

Roger KC6TRU