INSTALLATION

LINEAR AMPLIFIER INTERFACING

The “TX GND” T/R control line is a transistor “open collector” circuit, capable of handling positive amplifier relay coil voltages of up to +50V DC and current of up to 400 mA. If you plan on using multiple linear amplifiers for different bands, you must provide external band- switching of the “TX GND” relay control line from the CAT/LINEAR jack.

Important Note!

Do not exceed the maximum voltage or current ratings for the “TX GND” line at the CAT/LINEAR jack. This line is not compatible with negative DC voltages, nor AC voltages of any magnitude.

Most amplifier control relay systems require only low DC voltage/current switching capability (typically, +12V DC at 25 ~ 75 mA), and the switching transistor in the FT-897will easily accommodate such amplifiers.

CW KEY/KEYER CONNECTIONS

All commonly-available keyer paddles should work perfectly with the built-in Electronic Keyer. The wiring configuration for the paddle is shown below.

KEY GND

DOT

DASH

KEY GND

DOT COMMON

DASH

COMMON

For straight-key operation, only the tip and shaft connections are used.

Note: Even when using a straight key, you must use a three-conductor (“stereo”) plug. If a two-conductor plug is used, the key line will be constantly shorted to ground.

When using an external electronic keyer, be absolutely certain that it is configured for “posi- tive” keying, not “negative” or “grid block” keying. The “key-up” voltage of the FT-857is +5V, and the “key-down” current is only about 1 mA.

For CW automated keying using a personal computer, with an external memory keyer pro- viding for manual sending, it usually is possible to connect the keyed lines together via a “Y” connector. Check with the documentation accompanying your keyer and your contest/ DX software for any cautions which need to be observed.

FT-857 Operating Manual

17

Page 18 Page 20
Page 19
Image 19
Vertex Standard FT-857 manual CW KEY/KEYER Connections, Important Note
Page 18 Page 20

FT-857 specifications

The Vertex Standard FT-857 is a compact and versatile all-mode transceiver that has become popular among amateur radio operators since its introduction. With its ability to operate in VHF, UHF, and HF bands, the FT-857 caters to a diverse range of communication preferences and provides exceptional performance for both mobile and base station applications.

One of the key features of the FT-857 is its coverage of a broad frequency range, spanning from 160 meters to 2 meters and covering the 70 cm band. This wide frequency coverage allows amateur operators to communicate with fellow enthusiasts across various bands, ensuring versatility in operational environments. The FT-857 offers an output power of up to 100 watts on HF and 50 watts on VHF/UHF, providing sufficient power for effective communication, whether in local or distant contacts.

Another distinctive characteristic of the FT-857 is its all-mode capability. It supports various modes of operation, including SSB, CW, AM, and FM, making it suitable for different operating styles and preferences. The inclusion of advanced digital signal processing (DSP) technology enhances audio clarity and offers noise reduction features, which are crucial in crowded bands. This DSP capability also aids in improving signal quality and overall communication experience.

Portability is a significant advantage of the FT-857. Its compact size and lightweight design make it an excellent choice for field operations and portable setups. Additionally, the transceiver is well-equipped with features such as built-in memory channels, allowing users to save and quickly access frequently used frequencies. The FT-857 also includes a built-in automatic antenna tuner, which makes it easier for operators to set up and optimize their antenna configurations without requiring additional external devices.

The FT-857 is designed with user-friendly controls and a clear LCD display, enabling operators to quickly adjust settings and monitor communication details without confusion. The visibility of the display is especially vital for use in different lighting conditions, ensuring that users can operate efficiently whether in bright sunlight or low light conditions.

In summary, the Vertex Standard FT-857 is a highly capable, compact transceiver that offers an effective solution for amateur radio communication. With its all-band, all-mode capabilities, robust DSP technology, and user-friendly design, the FT-857 remains a popular choice for both enthusiasts and professionals alike, facilitating engaging communication experiences across multiple bands and modes.
Top Page Image Contents