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Repeater frequency sets are known as "repeater pairs", and in the ham radio community most follow ad hoc standards for the difference between the two frequencies, commonly called the offset. In the USA two-meter band, the standard offset is 600 kHz (0.6 MHz), but sometimes unusual offsets, referred to as oddball splits, are used. The actual ...
On VHF frequencies such as 2-meters, antenna height greatly influences how far one can talk. Typical reliable repeater range is about 25 miles (40 km). Some repeaters in unusually high locations, such as skyscrapers or mountain tops, can be usable as far out as 75 miles (121 km). Reliable range is very dependent on the height of the repeater ...
A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [1]
For ham/amateur radio operators, two linked repeaters are near the top of the mountain. The frequencies are 146.74 MHz, with a 600 kHz negative offset, a PL Tone of 100 Hz (the 2 meter repeater), and 53.75 MHz, with a 1.7 MHz negative offset, and a PL Tone of 100 Hz (the 6 meter repeater).
American radio amateurs may use a maximum of one watt of radiated RF power, on any ham frequency authorized for data emissions, to control RC models. [10] Canadian radio amateurs may use any amateur frequency above 30 MHz for the control of RC models. [11] Plus or minus 5 MHz is a common repeater frequency offset in the 70 cm band.
The 2 200 metre band is available for use in several countries, and the 2007 World Radiocommunication Conference (WRC-07) recommended it as a worldwide amateur allocation. Before the introduction of the 2 200 metre band in the U.K. in 1998, operation on the even lower frequency of 73 kHz, in the LF time signal band, was allowed from 1996–2003.
Transmit Frequency Range 144 MHz to 148 MHz (alternate 144 MHz to 146 MHz) Receive Frequency Range 136 MHz to 174 MHz (alternate 144 MHz to 148 MHz) Emission: FM; Power Output: FM 5W / 10W / 30W / 75W; Standard Repeater Shift: +/- 600 kHz; Audio Output: 3W into 8 Ohms @10% THD; Antenna Impedance: 50 Ohms unbalanced
An extensive digital repeater, or "digipeater" network provides transport for APRS packets on these frequencies. Internet gateway stations (IGates) connect the on-air APRS network to the APRS Internet System (APRS-IS), which serves as a worldwide, high-bandwidth backbone for APRS data. Stations can tap into this stream directly, and a number of ...
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