Remote Antenna Switch
For many years I have been using an
Ameritron remote
antenna switch, model RCS-8V, to select among my dipole antennas.
Lately it has become erratic and some of the ports no longer work.
Looking to replace it, I found that good remote switches are somewhat
expensive. I thought I could build my own, but the problem was finding
a suitable waterproof enclosure.
One day I was browsing the
interesting Adafruit
web site, and I stumbled across a waterproof plastic box approximately
17x12x7.5 CM. I ordered one and here is the result. (I haven't provided
a link because the box may no longer be available.) (Also available
from Banggood.)
The relays are 110VAC, because I had 4 of them in my parts
box. No reason why other voltage relays could not be used, just
provide the correct voltage for your relays. I used the dead bug wiring
method; simple but only good for HF. BTW my relays are DPDT and I wired
the two sides together, which should provide longer life and lower
contact resistance.
The inside switch box was built in a recycled box. It shows 1..5
on the case but there are only 4 relays and the switch has only 4
positions. I had some reservations about using 110VAC for the relays
but I really wanted to use up those surplus relays. The power switch is
double pole so when the switch is off, the control line is completely
disconnected from the mains. In the remote box the control lines are
connected only to the relay coils, not the bottom plate or anything
else. If you're careful, this should be a safe installation.
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