HF/VHF/UHF All Mode Transceiver FT-857D

The Yaesu HF/VHF/UHF Allmode Mobile Transceiver FT-857D has the DSP built in to a CPU beneath the Main Unit so there is no DSP connector or DSP switch on the top of the board. The FT-857D also has a high stability Ref Unit as standard.

Detachable front plate.

Later versions of the FT-857D did away with the switch used for setting the pre-driver and driver idle currents on the Main Unit.

The idle current is then set a different way, detailed in more recent versions of the Service Manual (pdf).

This version is the U.K. / EU one and it had SO-239 socket for HF antenna and N-type socket for 2m/70cms antenna. The US version had SO-239 sockets for both antennas.

See also the version FT-857 without DSP-feature in receiving mode.

Frequency Ranges
Receive: 0.1-56 MHz, 76-108 MHz, 118-164 MHz, 420-470 MHz
Transmit: 160 - 6 Meters (USA: includes 60 meters), 2 Meters, 70 centimetres (Amateur bands only)
Emission Modes: A1A (CW), A3E (AM), J3E (LSB/USB), F3E (FM), F1D (9600 bps packet), F2D (1200 bps packet)
Synthesizer Steps (Min.): 10 Hz (CW/SSB), 100 Hz (AM/FM/WFM)
Antenna Impedance: 50 Ohms, unbalanced
Operating Temp. Range: 14 ºF to 140 ºF (–10 °C to +60 °C)
Supply Voltage: Normal: 13.8 VDC ±15 %, Negative Ground
Current Consumption: Squelched: 550 mA (Approx.) Receive: 1A, Transmit: 22A
Display back light is adjustable for colour, contrast and brightness.
Front facia and controls are removable for mounting on the dashboard of a vehicle, with the body of the TX/RX elsewhere, e.g. in the boot of the vehicle.

Transmitter
RF Power Output: (@13.8 V DC)
160 - 6m; SSB/CW/FM 100W, AM Carrier 25W
2m; SSB/CW/FM 50W, AM Carrier 12.5W
70cm; SSB/CW/FM 20W, AM Carrier 5W
Modulation Types: SSB: Balanced Modulator, AM: Early Stage (Low Level), FM: Variable Reactance
FM Maximum Deviation:±5 kHz (FM-N: ±2.5 kHz)
Spurious Radiation:–50 dB (1.8-29.7 MHz) –60 dB (50/144/430 MHz)
Carrier Suppression:>40 dB
Opp. Sideband Suppression: >50 dB
SSB Frequency Response:400 Hz-2600 Hz (–6 dB)
Microphone Impedance:200-10k Ohms (Nominal: 600 Ohms)

Receiver
Circuit Type: Double-Conversion Super heterodyne (SSB/CW/AM/FM) Super heterodyne (WFM)
Intermediate Frequencies: 1st: 68.33 MHz (SSB/CW/AM/FM); 10.7 MHz (WFM) 2nd: 455 kHz
Image Rejection: HF/50 MHz: 70 dB, 144/430 MHz: 60 dB
IF Rejection: 60 dB
Selectivity (–6/–60 dB): SSB/CW: 2.2 kHz/4.5 kHz, AM: 6 kHz/20 kHz, FM: 15 kHz/30 kHz, FM-N: 9 kHz/25 kHz
SSB (optional YF-122S installed): 2.3 kHz/4.7 kHz (–66 dB)
CW (option YF-122C installed): 500 Hz/2.0 kHz
CW (option YF-122CN installed): 300 Hz/1.0 kHz
AF Output: 2.5 W (@4 Ohms, 10% THD or less)
AF Output Impedance: 4-16 Ohms

Vous pourrez trouver sous ce lien 305 modèles d'appareils, 289 avec des images et 139 avec des schémas.
Tous les appareils de Yaesu-Musen Co. Ltd.; Tokyo