Motorola Data Index > 자유게시판

A tuning technique in transmitters and receivers which uses a number of piezoelectric crystals to generate a wide range of frequencies. E-layer: The area of the ionosphere discovered roughly fifty five to ninety miles above Earth; it fades away a few hours after sunset. Reception of a sign for a couple of seconds through meteor scatter. DXpedition: An organized effort by ham radio operators to put a rare location on the air, or a visit by shortwave listeners to a site for favorable DX reception. A receiver circuit that generates a replacement service to enable intelligible reception of CW, FSK, and SSB indicators. A circuit used to set the frequency of a receiver or transmitter. The last transmission by a station during a contact, or the final amplifying stage of a radio transmitter. This web web page, this net site, the data presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of final update) by Kevin Custer W3KKC and a number of originating authors. All Rights Reserved, together with that of paper and net publication elsewhere. A term used to explain receivers and transmitters protecting no less than the frequency range of 500 kHz to 30 MHz and capable of operation in a number of totally different modes, including AM, CW, and SSB.

The GP300 and the GTX handhelds use numerous the same accessories, including batteries. A combined transmitter and receiver sharing a standard housing and many of the same elements. When two or more packet radio stations simultaneously try to transmit on the identical frequency. The frequency on which a radio transmission takes place, or the input and output frequency pair used by a repeater station. A non-governmental group that works to voluntarily assign frequencies to customers in order to stop interference, particularly for repeater stations. Placing a loading coil at the middle of an antenna with a purpose to decrease the antennas resonant frequency. The decrease the angle, the larger distance the radio sign will travel by way of ionospheric refraction. How nicely a receiver responds to weak indicators, measured in microvolts (mV); the decrease the number of microvolts indicated, the extra delicate the receiver. Lists by half number. SM50 and SM120 Service Manual half three of 4 8.Three MB PDF Donated by Eric Lemmon WB6FLY.

SM50 and SM120 Service Manual part 1 of 4 746 kB PDF Donated by Eric Lemmon WB6FLY. SM50 and SM120 Service Manual part 4 of 4 6.5 MB PDF Donated by Eric Lemmon WB6FLY. Touch-Code (DTMF) Microphone Manual 6881114E07-C four MB PDF Donated by Bob WA1MIK (SK). If anyone needs to donate further manual scans or onerous-to-get part numbers please let us know. Greater than you'll ever need to know. An outdoor antenna, often mounted on a rotor, that concentrates more transmitter power (or receives higher) in a sure course. More on what can be thought-about portable radios than handheld radios, however still very interesting. 20 kHz Spacing on UHF and Motorola Radios A short history of the UHF 20 kHz spacing issues in southern California and the way some radios deal with it. The MT2000 probably had the perfect receiver of the Jedi household of radios. A circuit to reduce the sensitivity of a receiver in fastened steps measured in decibels. RF gain: A management used to continuously vary the sensitivity of a receiver.

AGC: Abbreviation for automatic achieve control. ARQ: Abbreviation for automatic repeat request. In AMTOR, an ARQ is sent back to the transmitting station by the receiving station to request retransmission of lacking or corrupted parts. AMTOR: Acronym for "beginner teleprinting over radio," a mode that makes use of FSK to send messages containing error detection capabilities and the power request retransmission of lacking or corrupted data. A slang term for gear that makes use of vacuum tubes. A filter that makes use of a community of piezoelectric crystals to obtain excessive rejection of undesirable indicators. A circuit that takes a small "slice" out of the bandpass tuned by a receiver; this is beneficial for decreasing interference from narrow bandwidth signals. A receiver circuit that reduces electrical noise by quieting the receiver throughout noise pulses. Slow, gradual change within the frequency of a transmitter or receiver. A modulation approach that varies the ability output of a transmitter in accordance with the variations in the modulating audio signal. A modulation approach that varies the carrier frequency of a transmitter in accordance with the variations in the power of the modulating audio signal. The unmodulated provider frequency of a FM transmitter. A repeater station operating on frequencies not accepted by the appropriate frequency coordinator.