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A helical resonator filter for the local oscillator injection of a VHF receiver. The view is from the bottom (shorted end) of the resonators. The local oscillator and RF amplifier boards attach to the bottom of the assembly and have loops that couple to the resonators forming respectively the input and output ports of the filter.
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.
Note 1: A duplexer must be designed for operation in the frequency band used by the receiver and transmitter, and must be capable of handling the output power of the transmitter. Note 2: A duplexer must provide adequate rejection of transmitter noise occurring at the receive frequency, and must be designed to operate at, or less than, the ...
Repeaters are found mainly in the VHF 6-meter (50–54 MHz), 2-meter (144–148 MHz), 1.25-meter band (1 1 ⁄ 4 meters) (220–225 MHz) and the UHF 70 centimeter (420–450 MHz) bands, but can be used on almost any frequency pair above 28 MHz. In some areas, 33 centimeters (902–928 MHz) and 23 centimeters (1.24–1.3 GHz) are also used for ...
(480 MHz to 520 MHz is not available in the UK to comply with Ofcom regulations and are blocked by the manufacturer). Features include CTCSS and duplex operation for use with local repeaters, dual watch and dual reception, an LED flashlight, voice prompts in either English or Chinese and programmable LED lighting for the LCD display.
The case drew immediate comparisons to an incident in November in Laos in which six tourists — including one American and two Australian teenagers — died after drinking tainted alcohol at a ...
SDR(X) HF, VHF & UHF [110] Pre-built 0.1 – 1850 MHz (R820T tuner) ? No Optimized for HF amateur bands with 4 user selectable pre-select HF filters ? USB Yes Yes Yes SignalShark [111] Pre-built 8 kHz - 8 GHz 40 MHz 16 N/A No ? < 1 ? Gigabit Ethernet Yes ? ? ? SoftRock-40 [112] Kit 7.5 MHz ext No 48 kHz 0/1 USB Yes Yes Yes SoftRock Lite II [113 ...
Watch firsthand, in 360 video, as Susan Sarandon listens and learns about refugees' hopes, dreams and journeys
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