week 9 - Reocities
... 60 and 300 Hz that must be present to access a repeater. • Also known as PL, private line, quiet channel, tone access. CTCS (continuous Tone Coded Squelch) • Other systems include tone burst, and digital private line. • Crossband repeaters. Receive transmissions on one band, retransmit on another. ...
... 60 and 300 Hz that must be present to access a repeater. • Also known as PL, private line, quiet channel, tone access. CTCS (continuous Tone Coded Squelch) • Other systems include tone burst, and digital private line. • Crossband repeaters. Receive transmissions on one band, retransmit on another. ...
FM-Radio Broadcasting
... As in AM-radio reception, common tuning between the RF amplifier and the local oscillator allows the mixer to bring all FM-radio signals to a common IF bandwidth of 200 kHz, centered at fIF = 10.7 MHz. Since the message signal m(t) is embedded in the frequency of the carrier, any amplitude variation ...
... As in AM-radio reception, common tuning between the RF amplifier and the local oscillator allows the mixer to bring all FM-radio signals to a common IF bandwidth of 200 kHz, centered at fIF = 10.7 MHz. Since the message signal m(t) is embedded in the frequency of the carrier, any amplitude variation ...
Project 2
... Sometimes, the output of the op-amp will feed back to the V+ input. This is called positive feedback and it can be used to provide hysteresis to the op-amp circuit. (The output of a device with hysteresis depends not only upon its present inputs, but upon past inputs as well.) ...
... Sometimes, the output of the op-amp will feed back to the V+ input. This is called positive feedback and it can be used to provide hysteresis to the op-amp circuit. (The output of a device with hysteresis depends not only upon its present inputs, but upon past inputs as well.) ...
Local Oscillator / Harmonic Mixer Frequency Measurement System
... based a local oscillator and a harmonic mixer. The components were purchased from stock as discrete components Fig. 1 is a photograph of the assembled system and the circuit can be identified. The signal from the microwave source to be counted is feed into the harmonic mixer along with the output of ...
... based a local oscillator and a harmonic mixer. The components were purchased from stock as discrete components Fig. 1 is a photograph of the assembled system and the circuit can be identified. The signal from the microwave source to be counted is feed into the harmonic mixer along with the output of ...
Project: Electronic Cricket
... – Build a noninverting amplifier with a gain of 11. A high pass filter at 1 radian/sec and low pass at 100 radians/sec. Use power supply voltages of +5 and -5 volts. – Test it by connecting the input to the waveform generator and the output to the scope as shown below. – Set up the waveform generato ...
... – Build a noninverting amplifier with a gain of 11. A high pass filter at 1 radian/sec and low pass at 100 radians/sec. Use power supply voltages of +5 and -5 volts. – Test it by connecting the input to the waveform generator and the output to the scope as shown below. – Set up the waveform generato ...
Low Phase Noise Rubidium Atomic Oscillator Module
... and -158dBc/Hz at 10kHz. It is housed in a 95.5 x 62.5 x 44.3mm module so can be used in a 1U rack. The electrical connections include an SMA connector for RF output, RS232 connectors RX & TX, a voltage control input and a frequency locked monitor. With a short term stability 100 times better than a ...
... and -158dBc/Hz at 10kHz. It is housed in a 95.5 x 62.5 x 44.3mm module so can be used in a 1U rack. The electrical connections include an SMA connector for RF output, RS232 connectors RX & TX, a voltage control input and a frequency locked monitor. With a short term stability 100 times better than a ...
Radio basics - Berkeley Robotics
... LNA, and then is fed into another pair of mixers driven by another local oscillator. For convenience we can assume that both of our local oscillators are at the carrier frequency, but most radios actually employ intermediate frequencies which we can ignore. The output voltage of the LNA is proportio ...
... LNA, and then is fed into another pair of mixers driven by another local oscillator. For convenience we can assume that both of our local oscillators are at the carrier frequency, but most radios actually employ intermediate frequencies which we can ignore. The output voltage of the LNA is proportio ...
Simple Loop Transmitter
... The Simple Loop Transmitter provides an easy way of generating an AM radio signal which can be used to demonstrate the principles of AM radio transmission and also provide a signal for a Simple Radio in the absence of a long wire aerial or nearby AM radio transmitter. The output power is ...
... The Simple Loop Transmitter provides an easy way of generating an AM radio signal which can be used to demonstrate the principles of AM radio transmission and also provide a signal for a Simple Radio in the absence of a long wire aerial or nearby AM radio transmitter. The output power is ...
Performance Enhanced High Speed UWB GPR System for Buried Rebar Detection Tian Xia, Anbu Venkatachalam, Yu Zhang Dylan Burns, Dryver Huston
... ‐ Real time high speed data acquisition: 8Gsps, 10‐bit; ‐ Quad‐core processor for multi‐thread parallel data acquisition and transmission ; ‐ High pulse repetition frequency (up to 30 KHz) to achieve fine spatial resolution. ...
... ‐ Real time high speed data acquisition: 8Gsps, 10‐bit; ‐ Quad‐core processor for multi‐thread parallel data acquisition and transmission ; ‐ High pulse repetition frequency (up to 30 KHz) to achieve fine spatial resolution. ...
PLL synthesizing oscillator (3)
... This IC is composed from the phase comparator which detects the difference between the reference frequency and the comparison frequency and the VCO which generates the digital pulse. There are two kinds of phase comparators. As for the 1st, it outputs the phase difference of the input signal (the re ...
... This IC is composed from the phase comparator which detects the difference between the reference frequency and the comparison frequency and the VCO which generates the digital pulse. There are two kinds of phase comparators. As for the 1st, it outputs the phase difference of the input signal (the re ...
Angle Modulation Part 2
... n x fc=5000 x 200kHz=1000MHz So, down converter with oscillating needed to put fc in the FM band of 88MHz-108MHz ...
... n x fc=5000 x 200kHz=1000MHz So, down converter with oscillating needed to put fc in the FM band of 88MHz-108MHz ...
Heterodyne
Heterodyning is a radio signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden, in which new frequencies are created by combining or mixing two frequencies. Heterodyning is used to shift one frequency range into another, new one, and is also involved in the processes of modulation and demodulation. The two frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer. In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum f1 + f2 of the two frequencies, and the other at the difference f1 − f2. These new frequencies are called heterodynes. Typically only one of the new frequencies is desired, and the other signal is filtered out of the output of the mixer. Heterodynes are related to the phenomenon of ""beats"" in acoustics.A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.