RECEIVER ACCESSORIES

AGC (AUTOMATIC GAIN CONTROL)

The receiver recovery time constant of the AGC system may be modified to match your operating needs.

1.Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, until Multi Function Row “l” [NB, AGC, AUTO] appears on the display.

2.Press the [C] key to toggle the AGC recovery time constant among the following selec-

tions:

AUTO ð FAST ð SLOW ð AUTO > .....

where “AUTO” represents “FAST” on CW and DIG (AFSK), and “SLOW” on the voice modes.

If you disable the AGC by pressing the [B](AGC) key (to make the parentheses disappear), the S-meter (which monitors AGC voltage) will cease to function.

Depending on the setting of the RF Gain control, incoming signals will probably be dis- torted if the AGC is turned off.

NOISE BLANKER

The IF Noise Blanker may be useful in reducing or eliminating some types of impulse noise, especially noise generated by automotive ignition systems.

1.Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, until Multi Function Row “l” [NB, AGC, OFF] appears on the display.

2.Press the [A](NB) key to activate the Noise Blanker. The “u” icon will appear at the left side of the “NB” selection, indicating that the Noise Blanker is now on.

3.To adjust the blanking level, press and hold in the [A](NB) key for one second. This instantly activates Menu Mode No-063[NB LEVEL], which allows adjustment of Noise Blanking Level. Rotate the DIAL knob to set a higher or lower blanking level (on a scale of 0 to 100). When done, press and hold in the [FUNC] key for one second to save the new setting and return to normal operation.

4.Press the [A](NB) key again to turn the Noise Blanker off.

During very crowded band conditions, you may wish to turn the Noise Blanker off, as its use will degrade the strong-signal-handling capability of the receiver

somewhat.

FT-857 Operating Manual

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Vertex Standard FT-857 manual AGC Automatic Gain Control, Noise Blanker
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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.
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