[TowerTalk] Remote Antenna Relay

[Joe Subich, K4IK]

> Starting from the power supply, my Heathkit switch uses  2 .001 uF disks
> and an 8.48 uH RFC in a pi configuration, followed by a 75 ohm 5 watt
> resistor and a 1 mH RFC in series.  The resistor's role is not explained,
> but all the rest is described as RF isolation.  Transmitter power is
> coupled to the feedline by a pair of .02 uF disks in parallel, presumably
> for current-carrying capability.

The resistor would be for current limiting in case the feedline became 
shorted.  Protect the power supply, particularly if one is "borrowing" 
the voltage from a high capacity power supply used elsewhere!  The current 
limiting resistor might require some changes in power supply and/or relay 
coil voltage but worthwhile. 





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