The Yaesu FT-857D is a multimode amateur transceiver that transmits and receives communications on bands ranging from high frequency (HF) to very high frequency (VHF) to ultra high frequency (UHF). It has inputs for an HF/6M antenna and a 2M/440MHz antenna, as well as a removable front panel. It is even remotable with a separately sold kit.
The Yaesu 857D weighs 2.09kg and measures 6.1 inches by 2 inches by 9.2 inches. It operates in temperatures ranging from 14 degrees to 60 degrees Celsius. It runs on 13.8 volts of negative ground direct current power, plus or minus 10 per cent. Its frequency stability is plus or minus 4 parts per million (ppm) between temperatures of -10 and 50 degrees Celsius. Its emission modes are as follows: A1 (continuous wave), A3 (amplitude modulation, or AM), A3J (lower and upper sidebands), F1 (9,600 bps packet), F2 (1,200 bps packet) and F3 (frequency modulation, or FM). Its minimum synthesizer steps are 10 Hz (continuous wave/single-sideband modulation) and 100 Hz (AM, FM and wideband FM).
The Yaesu 857D receives transmissions over frequencies that range from 0.1 to 56, 76 to 108, 118 to 164 and 420 to 470MHz. When receiving, it consumes between 0.55 and 1 ampere (A). Its sensitivity on the SSB/CW modulation (considering 10 dB signal-to-noise ratio) ranges from -uV to 0.125 uV. On AM, it ranges from 32 uV to 1 uV. Considering a 12 dB signal-to-noise and distortion ratio for FM, the sensitivity ranges from 0.5 uV to 0.2 uV. Its first intermediate frequency is 68.33MHz on SSB, CW, AM and FM, and 10.7MHz on wideband FM. Its second intermediate frequency is 455 kHz. Its audio output is 2.5 watts into 4 ohms at 10 total harmonic distortion, with impedance that ranges from 4 ohms to 16 ohms.
The 857D transmits over frequencies that include the range between 160 and 6 meters, 2 meters, 70 centimetres (only for amateur bands) and the Alaska emergency frequency at 5,167.5 kHz. It consumes about 22 A during transmission. Its power output is 100 watts when transmitting between 160 and 6 meters, 50 watts at 2 meters and 20 watts at 70 centimetres. It has balanced modulation over SSB, variable reactance over FM and early stage modulation over AM. Its maximum deviation on FM is 5 kHz. Its SSB frequency response ranges from 400 Hz to 2,600 Hz. Its microphone impedance ranges from 200 ohms to 10,000 ohms, with the supplied microphone offering an impedance of 2,000 ohms.
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