Author Topic: CW keying lines as general use switch control  (Read 4342 times)

VK3ZFS

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CW keying lines as general use switch control
« on: 2010-11-16, 05:51:43 »
Im looking at using the CW keyer lines for general use switch control, to control 2 relays at my remote end, can the keyer out support switching a 12 volt relay @ 100mA coil current?
Also comferm there are 3 bidirectional keyer lines, for general use if not using CW keying function?

73s
Frank VK3ZFS QF22MI

VK3OE

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Re: CW keying lines as general use switch control
« Reply #1 on: 2010-11-17, 10:29:37 »
Hello Frank,

I had a try at this but it seems that it is a bit of an ask...

However, I used a 5v single C/O contact reed relay (very low power) and a small amount of series resistance to cope with the 8V from the box and then used this to switch a high current relay for turning the rig on when the control is connected. Works great. Put a diode across the larger relay coil to avoid reducing the life of the reed relay contacts.

73

Andrew.