COAX PHASE LINE SHIELD SWITCHING
Hello to all,
I am in the process of constructing a two element phased vertical system for
forty meters. I would like to be able to switch the antenna pattern
direction remotely from inside the station.
At first glance the information given in the antenna books seems simple
enough. A single-pole double-throw relay to the center conductors of the
Coax lines at a junction box and I am all set.
Taking a second look it seems to me that the Coax shields should also be
switched the same way. This would require mounting the Coax fittings
(SO-239) on a plastic box connecting the shield side of the Coax fittings
through a second single-pole double-throw relay.
I will be using Jennings RJ1A vacuum relays for the switching.
I am shore there will be some degrade in the overall system performance as
compared to a fixed direction system with no pattern direction switching.
Any comments or suggestions please.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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