tailieunhanh - Ham Radio for Dummies 2004 phần 10

Nếu bạn chỉ là bắt đầu trong ngành điện tử, tôi khuyên bạn nên bắt đầu xây dựng cuộc phiêu lưu của bạn với bộ dụng cụ. Khi tôi bắt đầu, bạn có thể tìm thấy Heathkit trong mỗi căn lều ham. Hôm nay, bộ dụng cụ có sẵn từ nhiều nguồn, chẳng hạn như Ramsey, Ten-Tec, Vectronics, RadioShack, và những người khác. | Appendix A Glossary 323 Operator primary station license An amateur license actually includes two licenses in one. The operator license is that portion of an Amateur Radio license that gives permission to operate an amateur station. The primary station license is that portion of an Amateur Radio license that authorizes an amateur station at a specific location. The station license also lists the call sign of that station. Output frequency A repeater s transmitting frequency. To use a repeater transmit on the input frequency and receive on the output frequency. Packet radio A system of digital communication whereby information is broken into short bursts. The bursts packets also contain addressing and error-detection information. Parasitic beam antenna See Beam Antenna. Parasitic element Part of a directive antenna that derives energy from mutual coupling with the driven element. Parasitic elements are not connected directly to the feedline. Peak envelope power PEP The average power of a signal at its largest amplitude peak. Pecuniary Payment of any type whether money or other goods. Amateurs may not operate their stations in return for any pecuniary. Phone Another name for voice communications. Phone emission The FCC name for voice or other sound transmissions. Phonetic alphabet Standard words used on voice modes which make understanding letters of the alphabet easier such as those in call signs. The call sign KA6LMN stated phonetically is Kilo Alfa Six Lima Mike November. PL See CTCSS. Polarization The electrical-field characteristic of a radio wave. An antenna parallel to the surface of the Earth such as a dipole produces horizontally polarized waves. An antenna perpendicular to the Earth s surface such as a 14-wave vertical produces vertically polarized waves. An antenna with both horizontal and vertical polarization is circularly polarized. Portable device A radio transmitting device designed to have a transmitting antenna that is generally within 20 .