Non-repeated frequencies

What are non-repeated frequencies?

Non-repeated frequencies, generally referred to as "simplex" frequencies, do not have the use of a repeater.

In other words, the only way to hear the mobile units is to be close to them. The base station is generally easy to receive, as it uses a much higher powered transmitter and receiver in its operation.

A good example of agencies that use simplex frequencies are LIPA, MTA Police, and the New York State Police, Troop L.

The above are just a few examples of simplex frequencies, but they are some of the most important.

To illustrate how important the proximity of the transmitting unit is to the receiver in regards to the clarity of the transmission, reference the two recordings of a simplex frequency conversation below.

Click here for a recording of a New York State Police car from Troop L in close proximity to my home receiving station.

Click here for a recording of a New York State Police car from Troop L a large distance away from my home receiving station.

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