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An ICOM IC-7300 Radio Tuned to the 20 Meter Band. The ICOM IC-7300 is a multimode 6 meter, 4 meter (ITU Region 1 only) and HF base station amateur radio transceiver. [1] The IC-7300 was announced to the public at the Japan Ham Fair in 2015. [2] The radio has 100 watts output on CW, SSB, and FM modulations and 25 watts of output in AM. [3]
Morse code is called the original digital mode. Radio telegraphy, designed for machine-to-machine communication is the direct on / off keying of a continuous wave carrier by Morse code symbols, often called amplitude-shift keying or ASK, may be considered to be an amplitude modulated mode of communications, and is rightfully considered the first digital data mode.
0/1 USB Yes Yes Yes FUNcube Dongle Pro+ [56] Pre-built 0.15 – 240 MHz, 420 – 1900 MHz 16 No 192 kHz 0/1 USB Yes Yes Yes HackRF One [58] Pre-built 1 MHz – 6 GHz 20 MHz 8 8 Yes 8 – 20 Msps 20 0/1 USB 2.0 Yes Yes Yes Hermes-Lite2 (build9) [59] experimental kit 0 to 38.4 MHz 1.536 MHz 12 bits @ 76.8 MHz 12 bits @ 153.6 MHz Yes 76.8 MSPS
The Icom IC-V82 is a VHF handheld transceiver with coverage in the two-meter band (144–146 MHz) and a maximum output power of 7 watts. [8] It was manufactured and sold by Icom from 2004 to 2014. [9] [10] [11] Following its discontinuation, Icom issued an advisory warning about counterfeit radios, including the IC-V82.
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In parts of ITU Region 1 5 metres: 58.0–60.1 MHz: in parts of ITU Region 1 4 metres: 70–70.5 MHz: in parts of ITU Region 1 2 metres: 144–148 MHz 144–146 MHz ITU Region 1 1.25 metres 219–220 MHz Fixed digital message forwarding systems 222–225 MHz: US & Canada UHF; 70 centimetres: 420–450 MHz 430–440 MHz in ITU Region 1
Graphs illustrating the problem of image response in a superheterodyne. The horizontal axes are frequency and the vertical axes are voltage. Without an adequate RF filter, any radio signal S2 (green) from the antenna at the image frequency is also heterodyned to the IF frequency along with the desired radio signal S1 (blue) at , so they both pass through the IF filter (red).
Other common RF system components such as filters, attenuators, splitters, and combiners will generate some amount of mismatch loss. While completely eliminating mismatch loss in these components is near impossible, mismatch loss contributions by each component can be minimized by selecting quality components for use in a well designed system.