Remote Antenna Relay Selector
The circuit above is what I propose to use for remote relay
antenna selection. After discussion with Julius D. Jones, the owner of
W2IHY Technologies, who kindly related how he achieved 70 dB
isolation through the use of two relays instead of a single relay that
only provides 40 db of isolation, I have decided to construct a remote
coax selector box myself.
Below are some photographs taken during the construction of the remote antenna relay selector system.
The Alpha Digital Antenna Selector (DAS) controls the remote antenna selection relays. The Alpha 78A linear amplifier automatically tunes to the transceiver VFO transmit frequency, and selects the antenna that has been previously programmed for that frequency band. The DAS may also be controlled directly by TRX-Manager either locally or remotely.
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