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Remote Antenna Relay Selector
The circuit above is my proposed design for remote relay antenna selection. After discussions with Julius D. Jones of
W2IHY Technologies, who explained that using two relays can provide 70 dB isolation (versus 40 dB for one relay), I decided to construct a remote coax selector box myself.
This design uses a single 3-pole DT relay to achieve the required isolation and protect against high voltage flash-over by inserting two open contacts into the unused portion of the circuit. This permits the inclusion of MOVs, surge protection, capacitors, and 1KV PIV diodes (reverse biased) to dampen inductive spikes.
Constructing this remote relay selector allows for a weatherproof enclosure and provides the pride and satisfaction of a custom-designed system.
Below are photographs taken during the construction of the remote antenna relay selector system.