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In same-band repeaters, isolation between transmitter and receiver can be created by using a single antenna and a device called a duplexer. The device is a tuned filter connected to the antenna. In this example, consider a type of device called a band-pass duplexer. It allows, or passes, a band, (or a narrow range,) of frequencies.
It is difficult to design a single antenna to receive such a wide wavelength range, and there is an octave gap from 216 to 470 MHz between the VHF and UHF frequencies. So traditionally, separate antennas (outdoor antennas with separate sets of elements on a single support boom) have been used to receive the VHF and UHF channels. [6]
Ultra high frequency (UHF) is the ITU designation [1] [2] for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter).
UHF: 225 TO 399.975 MHz Estimated Range: 5–20 km (3-12 mi) Dependent on conditions. This is the approximate range when not connected to a repeater or a network. Power Output: 2W to 10W Power Source: BA-5590/U non-rechargeable or BB-2590/U and UBI-2590 rechargeable batteries. Antenna: These units use the MPMP100X4 antenna (NSN 5985-01-184-0035).
While the repeater station is designed for simultaneous reception and transmission, mobile units need not be equipped with the bulky and costly duplexers, as they only transmit or receive at any time. Mobile units in a repeater system may be provided with a "talkaround" channel that allows direct mobile-to-mobile operation on a single channel ...
Inherently an antenna diversity scheme requires additional hardware and integration versus a single antenna system but due to the commonality of the signal paths a fair amount of circuitry can be shared. Also with the multiple signals there is a greater processing demand placed on the receiver, which can lead to tighter design requirements.
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. [1]: p.149 [2] The individual antennas (called elements) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship.
On 27 May 2011 the channel spacing on Australian UHF CB was changed, allowing the band to expand from 40 channels to 80 channels. [8] This was achieved by reducing the bandwidth of the existing channels and interleaving new channels between them, reducing channel spacing from 25kHz to 12.5kHz. The expansion effectively allows the use of 77 ...
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