[BC] Transmitter Safety

[WBRadiolists at aol.com]

In a message dated 05/01/2008 12:48:11 PM Eastern Daylight Time, 
DHultsman5 at aol.com writes:

> Glad most of these are gone or in backup mode. I love today's  transmitters 
>  with low voltage DC remote control circuits.  I don't know how  many times 
I 
>  have been bit on the terminal boards of remote control units in the  back 
of 
>  racks that switch 110 or 220 VAC to transmitters and phasors.

Before it was replaced, the old CCA AM5000D at WFIF used 120v control logic. 
The solution was very simple- I installed several relays inside the box. The 
contacts handled the 120v. I brought the coil leads out. A small external power 
supply (12v) provided the power to energize the relays when the remote 
switches were thrown. We used it in this configuration for quite a few years without 
a single problem. No more "getting bit" on the remote control circuit wiring. 
:)

Once we got the solid state Harris box, things were even easier with TTL 
control levels.

Willie...




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