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Radio Beacon Converter – Circuit Schematic
Radio Beacon Converter
The radio beacon band extends from 280 to 516 kHz. Each beacon has its own characteristic AM"-modulated morse-coded ...
Dual-Gate Mosfet Rf-Amp Stage – Circuit Schematic
Dual-Gate Mosfet Rf-Amp Stage
The use of a double-tuned input and a single-tuned output yield superior RF selectivity to that of equivalent...
Cascode Rf Amplifier – Circuit Schematic
Cascode Rf Amplifier
A cascode amplifier using two MOSFETs is shown in the diagram. L2C1 and L3C2 resonate to the frequency in use. The cir...
Varactor-Tuned Preselector – Circuit Schematic
Varactor-Tuned Preselector
Varactor diodes replace the conventional 365-pF tuning capacitors, which reduces size and weight when used as a ...
Broadcast Band Booster – Circuit Schematic
Broadcast Band Booster
The use of a loop antenna of large size (12 18") provides a large signal pickup at AM broadcast frequencies. It has...
1296Mhz Rf Amplifier – Circuit Schematic
1296Mhz Rf Amplifier
Using an NEC70083, this 1296-MHz amplifier delivers about 17-dB gain and around 1- to 1.5-dB noise. It is constructed...
Wideband Rf Amplifier – Circuit Schematic
Wideband Rf Amplifier
This RF amplifier has wide bandwidth and dynamic range. It has a gain of 10 dB, noise figure less than 5 dB, and the ...
1 500-W Rf Amplifier – Circuit Schematic
1 500-W Rf Amplifier
The frequency range of this amplifier is 1.8 to 54 MHz. The amount of RF drive required for full output is about 30 W....
Receiver If Amplifier – Circuit Schematic
Receiver If Amplifier
Tl is tuned to converter-output frequency Ul to provide 45-to-50-dB gain, depending on the design of Tl and T2. C2, C...
Hf Transceiver Mixer – Circuit Schematic
Hf Transceiver Mixer
The transceiver mixer and carrier oscillator in the band-imaging (7- and 14-MHz) CW transceiver. Careful selection of ...
Simple Am Radio – Circuit Schematic
Simple Am Radio
An AM radio can be built of a simple diode detector and an audio amplifier. A random length of wire always serves as an ant...
Short Wave Receiver – Circuit Schematic
Short Wave Receiver
Using a Signetics NE602 in a varactor-tuned front end, the circuit of a shortwave receiver can be very simple and yet g...
Old-Time Radio – Circuit Schematic
Old-Time Radio
This circuit was used in the early days of radio to receive signals. Almost any battery-operated triode, such as a type 30, ...
Trf Radio – Circuit Schematic
Trf Radio
This simple AM radio uses a Ferranti ZN414 IC and runs from a 9-V supply. A 5he"-diameter ferrite rod serves as an antenna, and u...
Reflex Radio Receiver – Circuit Schematic
Reflex Radio Receiver
The RF signal is passed from the antenna through CI to the tuned circuit made up of LI and C2. One end of L2 feeds th...
Simple Low-Frequency Receiver – Circuit Schematic
Simple Low-Frequency Receiver
Using an NE602 heterodyne detector and Ul as an RF amplifier, this receiver tunes the middle portion of the l...
3.5 To 10Mhz Simple Superheterodyne Receiver – Circuit Schematic
3.5 To 10Mhz Simple Superheterodyne Receiver
In this circuit, Ul is a frequency converter that feeds the 455-kHz IF stage U2 and detector...
Deluxe Radar Detector – Circuit Schematic
Deluxe Radar Detector
This simple radar detector includes an audio amplifier for driving a loud speaker. As in Fig. 69-1, it uses an op amp...
Radar Detector – Circuit Schematic
Radar Detector
A simple detector of radar signals uses the junctions of the input transistors of an LM1458 op amp as RF detectors. The lead...
Active Rf Detector Probe – Circuit Schematic
Active Rf Detector Probe
An MFP102 FET is used as a wideband amplifier. LI can be 100 for 30 to 100 MHz or 1000 for 2 to 30 MHz. For LF, ...