TRANSMITTER OPERATION

FC-30 AUTOMATIC ANTENNA TUNER OPERATION

Antenna Tuner Memory System

The FC-30, working in concert with the FT-857, can store impedance matching data in its micro-computer memory, so as to provide instant adjustment as you transmit in different areas of a particular band. A total of 100 memories are provided: 11 of these are “general” memories apportioned one per band, while the remaining 89 are allocated for specific fre- quency data within the various bands, with the capability to resolve new tuning data every 10 kHz.

A few guidelines should be noted regarding the FC-30’s memory system:

Tuning data is stored when you make an active effort to store it by pressing and holding in the [A](TUNE) key for one second. Although the tuner will automatically activate itself if it encounters more than 1.5:1 SWR, this memory will not be stored unless you have pressed the [A](TUNE) key for one second. This allows you to store your favorite operating fre- quency areas into tuner memory without tying up memory space with matching data on seldom-used frequencies.

If the FC-30cannot resolve a satisfactory match because the SWR is above 3:1 (2:1 on the 50 MHz band), the tuning process will stop, and no memory data will be stored. However, you may wish to move frequency a few kHz, then press the [A](TUNE) key again for one second, as slight changes in the reactance may allow a match to be obtained. Then go back to the original frequency and try again.

Another technique which may allow matching in some situations is to add a few feet or meters of coaxial cable on the “antenna side” of the FC-30. This will change the impedance transformation taking place in the coaxial cable, possibly moving the impedance presented to the FC-30into an acceptable range. Note that this is not changing the actual antenna SWR, but only the impedance “seen” by the FC-30’s matching circuits.

If your antenna system presents an SWR of less than 1.5:1, you may wish to turn off the antenna tuner, as full transmitter power will be delivered to the antenna system without intervention by the FC-30.

If the impedance encountered by the FC-30exceeds 3:1, and the “HSWR” icon is illumi- nated, the microprocessor will not retain the tuning data for that frequency, as the FC-30presumes that you will want to adjust or repair your antenna system so as to correct the high SWR condition.

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FT-857 Operating Manual

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Vertex Standard FT-857 manual Antenna Tuner Memory System
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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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