FT-857 on HF/VHF/UHF auto saatja ja võimaldab baasjaama tüüpi jõudlust kompaktses sisus mis on ideaalne autos või välise akuga kaasaskantavaks töötamiseks. Wide frequency coverage, outstanding receiver
performance, and the convenience of optional remote-head operation
make the FT-857 the expert's choice for high-performance mobile
operation!
Põhiomadused
Ultra Compact Design
Measuring only 155 x 52 x 233 mm, the
FT-857 is the world’s smallest full-power HF/VHF/UHF multimode
transceiver! Its rugged case design is a masterpiece of ergonomic
design, with commonly used controls conveniently positioned for easy
access.
High-Performance Receiver Design
Building on the acclaimed performance
of the FT-1000D, Mark-V FT-1000MP, and FT-897, Yaesu’s engineers
have crafted the FT-857’s front end for a very low noise floor,
along with wide dynamic range. Using an up-conversion architecture
for HF with a first IF of 68.33 MHz, the FT-857 features a
double-conversion superheterodyne system (triple conversion on FM),
with the 2nd IF at 10.7 MHz. Extensive bandpass filtering in the
front end, along with careful device selection and gain distribution,
yield a receiver system ready for the strong-signal challenges of
today’s crowded bands!
Wide Frequency Coverage
Providing transmitter coverage of the
HF, 50 MHz, 144 MHz, and 430 MHz Amateur bands, the FT-857 also
includes receive coverage on 100 kHz to 56 MHz, 76 to 108 MHz,
118-164 MHz, and 420-470 MHz. Enjoy the excitement of public safety
monitoring, along with weather broadcasts, AM and FM broadcasts,
aviation communications, as well as the action on the Ham bands!
Versatile Memory System
The FT-857 provides up to 200 “Main”
memory channels, each of which may be named with an Alpha-Numeric
label of up to eight characters. These 200 Memories may be separated
into as many as 10 Memory Groups of 20 Memories each. For added
convenience, you also get a “Quick Memory” and a “Home Channel”
on each band, plus ten pairs of band-limit memories, to let you
restrict operation to a sub-band, if you like.
Digital Signal Processing (option)
For superior interference rejection and
transmitter “talk power,” the FT-857’s optional DSP circuitry
enhances both sides of the communications circuit. The FT-857’s DSP
Unit features a 24-bit high-tech D/A chip for signal processing.
Included are Bandpass Filter, Auto-Notch, and Noise Reduction
filters, along with a Microphone Equalizer.
Big Radio Tuning Dial and
Outstanding Ergonomics
Ease of operation of the FT-857 is
enhanced by the large-diameter (1.7”) Main Tuning Dial, similar in
size to the tuning knob of many base station rigs. Selectable tuning
steps of 2 kHz/4 kHz per revolution allow easy navigation around your
favorite bands, while important keys and switches are strategically
placed around the front panel for quick access.
Tehnilised näitajad
| Üldine |
| Sagedusvahemik | Transmit:
160 - 6 Meters, 2 Meters,
70 Centimetres (Amateur bands only)
5167.5 kHz (Alaska Emergency Frequency/USA Version)
Receive:
0.1-56 MHz, 76-108 MHz, 118-164 MHz, 420-470 MHz |
| Emission Modes | A1 (CW), A3 (AM), A3J (LSB/USB), F3 (FM),
F1 (9600 bps packet), F2 (1200 bps packet) |
| Sagedusastmed | 10 Hz (CW/SSB), 100 Hz (AM/FM/WFM) |
| Antennitakistus | 50 Ohms, Unbalanced |
| Töötemperatuur | -10 C to +60 C |
Sageduse stabiilsus
| ±4 ppm from 1 min. to 60 min after power on.
@25° C: 1 ppm/hour
±0.5 ppm/1 hour @25° C, after warmup
(with optional TCXO-9) |
| Toitepinge | Normal: 13.8 VDC ±15 %, Negative Ground |
| Energiatarve | Squelched: 600 mA (Approx.)
Receive: 1 A
Transmit: 22 A |
| Mõõdud (laiusxkõrgusxD) | 155 x 52 x 233mm |
Kaal (umbes)
| 2.1 kg |
| Saatja |
| RF Power väljund (@13.8 V DC) | | | SSB/CW/FM | AM Carrier | | 160- 6 Metres | 100 W | 25 W | | 2 Metres | 50 W | 12.5 W | | 70 Centimetres | 20 W | 5 W |
|
Modulatsiooni tüübid
| SSB: Balanced Modulator
AM: Early Stage (Low Level)
FM: Variable Reactance |
FM maksimaalne deviatsioon
| ±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 |
| Undesired Sideband Suppression | >50 dB |
| Audio Response (SSB) | 400 Hz-2600 Hz (-6 dB) |
Mikrofoni takistus
| 200-10k Ohms (Nominal: 600 Ohms) |
| Vastuvõtja |
| Circuit Type | Double-conversion superheterodyne (SSB/CW/AM/FM)
Superheterodyne (WFM) |
| Intermediate Frequencies | 1st : 68.33 MHz (SSB/CW/AM/FM); 10.7 MHz (WFM)
2nd: 455 kHz |
Selektiivsus
(-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 (option YF-122S installed): 2.3 kHz/4.7 kHz (-66 dB)
CW (option) YF-122C installed) : 500 Hz/2.0 kHz |
| Tundlikkus | | | SSB/CW | AM | FM | | 100 kHz-1.8 MHz | - | 32 μV | - | | 1.8 MHz-28 MHz | 0.2 μV | 2 μV | - | | 28 MHz-30 MHz | 0.2 μV | 2 μV | 0.5 μV | | 50 MHz-54 MHz | 0.125 μV | 1 μV | 0.2 μV | | 144/430 MHz | 0.125 μV | - | 0.2 μV |
(SSB/CW/AM = 10 dB S/N, FM = 12 dB SINAD)
Squelch Sensitivity:
| | SSB/CW/AM | FM | | 100 kHz-1.8 MHz | - | - | | 1.8 MHz-28 MHz | 2.5 μV | - | | 28 MHz-30 MHz | 2.5 μV | 0.32 μV | | 50 MHz-54 MHz | 1 μV | 0.16 μV | | 144/430 MHz | 0.5 μV | 0.16 μV |
|
| Image Rejection | HF/50 MHz: 70 dB
144/430 MHz: 60 dB |
| Maximum Audio Output | 2.5 W (4 Ohms, 10% THD or less) |
Heliväljundi takistus
| 4 to 16 Ohms |
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