Basically, what you describe is called a 'BDA', or Bi-Directional Amplifier, used a lot for hole fills. TX-RX and EMR are main sources of good units. Wilson is a source of not-so-good ones.
There was a real simplex repeater in CA for a while. rom what I understand, it was more or less 2 transceivers on 146.82 simplex on opposite sides of a BIIIIIG mountain. There was enough isolation between the two sites that it was impossible to talk simplex from one to the other. The radios were cross-connected, wire-line I presume, so that someone on one side transmitting would be retransmitted on the other side on the same freq. Burt Lang wrote: > Somewhere in my pile of data books I have an application note that > refers to a "simplex repeater" being used in commercial applications. > The booklet was from either dB Products or Pye as I recall. The purpose > of their "simplex repeater" was to fill local coverage holes. The > equipment described consisted of 2 beam antennas, one pointed at the > source and the other pointed at the hole with an amplifier and filter > between them. The antennas were adjusted for maximum isolation and the > amplifier gain was set to be considerably less than the isolation > between the antennas. > > Similar setups were used in the early days of television to give > coverage in behind mountains. > > These setups would simultaneously transmit on the same frequency. > > Has anyone else seen such application notes or booklets??? > > Burt VE2BMQ
