Manuals / Vertex Standard / Marine Equipment / Marine Radio

Vertex Standard FT-857 manual IPO Intercept Point Optimization, ATT Front END Attenuator

Models: FT-857

1 132
Download 132 pages 51.52 Kb
Page 44
Image 44

RECEIVER ACCESSORIES

IPO (INTERCEPT POINT OPTIMIZATION)

The IPO feature bypasses the receiver RF preamplifier, thereby eliminating the preamp’s gain. This feature is not available on the 144 MHz and 430 MHz bands.

1.Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, until Multi Function Row “m” [IPO, ATT, NAR] appears on the display.

2.Press the [A](IPO) key to bypass the receiver input preamplifier. The “u” icon will appear at the left side of the “IPO” selection, and the “” icon will appear on the display. indicating that the preamp is now disengaged from the receiver circuit.

3.Press the [A](IPO) key once more to re-activate the preamp.

On the bands below 14 MHz, the input preamplifier is rarely necessary, and acti- vation of the IPO feature will provide substantial protection against intermodulation and other problems associated with strong signal input to the receiver. Rule of thumb: so

long as the S-meter is moving on background noise, additional front-end gain is not necessary.

ATT (FRONT END ATTENUATOR)

The Attenuator will reduce all signals (and noise) by 10 dB, and it may be used to make reception more pleasant under extremely noisy conditions. This feature is not available on the 144 MHz and 430 MHz bands.

1.Press the [FUNC] key momentarily, then rotate the SELECT knob, as needed, until Multi Function Row “m” [IPO, ATT, NAR] appears on the display.

2.Press the [B](ATT) key to activate the Attenuator. The “u” icon will appear at the left side of the “ATT” selection, and the “” icon will appear on the display.

3.Press the [B](ATT) key once more to switch the Attenuator out of the receiver front end circuit. Signals will again be received at a level 10 dB louder than was the case when the Attenuator was engaged.

42

FT-857 Operating Manual

Page 43 Page 45
Page 44
Image 44
Vertex Standard FT-857 manual IPO Intercept Point Optimization, ATT Front END Attenuator
Page 43 Page 45

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.