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1750M Transverter Circuit – Circuit Schematic
1750M Transverter Circuit
This circuit was described in a recent edition of an amateur radio magazine. It allows operation in the 160- to 190-kHz band with up to 1 W (license free) in a...
49Mhz Fm Transmitter Circuit – Circuit Schematic
49Mhz Fm Transmitter Circuit
This 49-MHz FM transmitter consists of an audio amplifier, a low-pass filter, three RF stages, and a regulated-dc power supply. The output is about 16 mW into ...
Tracking Transmitter Circuit – Circuit Schematic
Tracking Transmitter Circuit
This tracking transmitter consists of four distinct subassemblies; a free-running multivibrator, a transmit switch, an audio-tone generator, and an FM transmit...
Vacuum Tube 80-40M Transmitter Circuit – Circuit Schematic
Vacuum Tube 80-40M Transmitter Circuit
Using a 6BW6 vacuum tube, the above transmitter delivers about 5 W output. CI is adjusted for cleanest CW note. C8 and C9 are 365 pF and dual-365 pF (parallele...
Simple Fm Transmitter Circuit – Circuit Schematic
Simple Fm Transmitter Circuit
Running from a 9-V battery, this transmitter can be used as a wireless microphone with an ordinary 88- to 108-MHz FM broadcast receiver. Keep the antenna lengt...
6W Morse-Code Transmitter 7Mhz Circuit – Circuit Schematic
6W Morse-Code Transmitter 7Mhz Circuit
The vacuum tube is still alive and useful in some applications, as in this CW transmitter, The circuit was built in old-fashioned breadboard style on a wooden ...
Atv Jr Transmitter 440Mhz Circuit – Circuit Schematic
Atv Jr Transmitter 440Mhz Circuit
This low-power video transmitter is useful for R/C applications, surveillance, or amateur radio applications. Seven transistors are used in a crystal oscillato...
10M Dsb Qrp Transmitter With Vfo Circuit – Circuit Schematic
10M Dsb Qrp Transmitter With Vfo Circuit
The three schematics represent three building blocks for a 10-meter SSB transmitter. Or these blocks can be used separately as circuit modules for other transm...
27.125Mhz Nbfm Transmitter Circuit – Circuit Schematic
27.125Mhz Nbfm Transmitter Circuit
Using a Motorola MC2833 one-chip FM transmitter, a few support components, and an MPF6660 FET RF amp, this transmitter delivers about 3 W into a 50- load....
Crystal-Controlled Fm Stereo Transmitter Circuit – Circuit Schematic
Crystal-Controlled Fm Stereo Transmitter Circuit
In This application, a BA1404 is used to generate an FM MPX baseband signal. This modulates a crystal oscillator (Q3) via a dual varactor series modulator. ...
Fm Stereo Transmitter Circuit – Circuit Schematic
Fm Stereo Transmitter Circuit
A BA1404 IC is used to generate a complete FM MPX signal. The chip contains all of the necessary circuitry. CI and R3, and R4 and C4 provide pre-emphasis. The ...
Subcarrier Adapter For Fm Tuners Circuit – Circuit Schematic
Subcarrier Adapter For Fm Tuners Circuit
Op amp Ul and its associated components comprise the 67-kHz bandpass filter. A twin-T network, comprised of four 1100-12 resistors and four 0.0022- capacitors,...
Ham Band Vfo Circuit – Circuit Schematic
Ham Band Vfo Circuit
This basic VFO for the 3- to 6-MHz range is coirimonly used in amateur applications, using a Colpitis circuit. For 5 to 5.5 MHz, C = C2 = 70 pF and for 3.5 to ...
Ne602 Rf Oscillator circuits – Circuit Schematic
Ne602 Rf Oscillator circuits
Just about any standard oscillator (such as a Colpitts or Hartley configuration) can be used to generate the LO (local oscillator) frequency ...
Rf Signal Generator Circuit – Circuit Schematic
Rf Signal Generator Circuit
This circuit uses a VFO operating from 15 to 18 MHz (Ul), which feeds a balanced mixer (U2). A fixed oscillator signal is mixed with this signal to generate an...
45Mhz If Amplifier With Crystal Filter Circuit – Circuit Schematic
45Mhz If Amplifier With Crystal Filter Circuit
A 40673 dual-gate MOSFET is matched to a crystal filter at 45 MHz. The filter impedance is around 2kQ....
Rf Preamplifiers Circuit – Circuit Schematic
Rf Preamplifiers Circuit
In this basic MAR-x-based circuit, both the input and output are comprised of a single dc-blocking capacitor (CI and C2 for the input and output, respectively)...
Switchable Vhf Active Antenna Circuit – Circuit Schematic
Switchable Vhf Active Antenna Circuit
The AA-7 active antenna contains only two active elements: Ql (an MFE201 N-chanriel dual-gate FET) and Q2 (a 2SC2570 ripri VHF silicon transistor), which provi...
Receiver/Scanner Preamp Circuit – Circuit Schematic
Receiver/Scanner Preamp Circuit
The low-cost Mini-Circuits MAR-X series of chips offer the RF builder a real advantage, with their inherent 50- input and output impedances (needed for RF syst...
70Mhz Rf Power Amplifier Circuit – Circuit Schematic
70Mhz Rf Power Amplifier Circuit
The SD1143 transistor provides a gain of about 14 dB in this circuit. It uses the fact that a 175-MHz device has a much higher gain when used at lower frequenc...