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DECL Documentation – Circuit Schematic
DECL Documentation
The following describes the design, construction, operation and use of the DECL (Decade PLL) module. The module has both a Phase Locked Loop (PLL) frequency mul...
4KHz-170MHz Wide Band RF Signal Generator I – Circuit Schematic
4KHz-170MHz Wide Band RF Signal Generator I
While most commercial grade signal generators offer more than just outputting a sinusoidal waveform, they are quite pricey for casual use. In this article, I wi...
Free-Power AM Radio – Circuit Schematic
Free-Power AM Radio
Here`s something that might intrigue you Crystal Radio builders out there: A one-transistor (Silicon, yet!) AM broadcast receiver that derives its power from am...
A Regenerative Receiver with AGC for 80 and 40 Meters – Circuit Schematic
A Regenerative Receiver with AGC for 80 and 40 Meters
Here`s a dual-band Regen that came from some encouraging emails from Jerry (K9UT) and another gentleman named Harvey, who built my original AGC-80, and its expe...
A Regenerative Receiver with AGC for 80 Meters or 3-10 MHz Shortwave – Circuit Schematic
A Regenerative Receiver with AGC for 80 Meters or 3-10 MHz Shortwave
Here`s a Regenerative Receiver project that I designed for the 80 meter Amateur band, but which can also be used in a wider-tuning configuration that covers app...
Remote antenna for 60 kHz (WWVB) reception – Circuit Schematic
Remote antenna for 60 kHz (WWVB) reception
Inside the outdoor box to which the loop is mounted showing the amplifier circuitry. The four capacitors visible at the lower-left corner of the perfboard are u...
The KA7OEI FT-817 RF Power Amplifier – Circuit Schematic
The KA7OEI FT-817 RF Power Amplifier
The 2SK2975 was reportedly been discontinued by the manufacturer and the replacement part was the RD07MVS1 manufactured by Mitsubishi. This device is very simil...
The KA7OEI FT-817 Schematic diagrams – Circuit Schematic
The KA7OEI FT-817 Schematic diagrams
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Decreasing intermod on the Kenwood TM-733 receivers – Circuit Schematic
Decreasing intermod on the Kenwood TM-733 receivers
The Kenwood TM-733A is an older dual-band mobile radio. This radio is capable of 50 watts transmit on VHF, 35 watts on UHF, full-duplex crossband repeat, and si...
10 gig transverter page – Circuit Schematic
10 gig transverter page
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The 146.460 MHz Repeater – Circuit Schematic
The 146.460 MHz Repeater
Construction of a radio telephone integrator and created my first radio phone / repeater. I had been playing with electronics and radios since that first receiv...
BCI Filter – Circuit Schematic
BCI Filter
Designing and building an AM Broadcast Sucker-outer. The undesired AM broadcast signal is shunted to ground with a series resonant circuit consisting of L1 and ...
Precision VXO for Crystal Characterization & Matching – Circuit Schematic
Precision VXO for Crystal Characterization & Matching
The Precision VXO (PVXO) and its matching Crystal Test Fixture (CTF) were created to provide a low cost means of evaluating the characteristics of crystals and ...
Original 2N2/40 Schematic Diagrams – Circuit Schematic
Original 2N2/40 Schematic Diagrams
This is the remainder of the receiver, including the post mixer amplifier, variable crystal filter, i. f. amplifier, product detector, local oscillator, receive...
2N2/15 CW Transceiver Design Page – Circuit Schematic
2N2/15 CW Transceiver Design Page
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50mhz – Circuit Schematic
50mhz
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Preamp Protection – Circuit Schematic
Preamp Protection
While working two-meter SSB from the Benson area, I decided that local terrain and the limited height of my home-made six-element yagi, necessitate I incorporat...
Mag Loop – Circuit Schematic
Mag Loop
Electronic equipment is not `cheap` and can be damaged in a number of ways, by electro-static discharge, by lightning and by transmitting withno antenna attach...
100W Medium Frequency Transmitter – Circuit Schematic
100W Medium Frequency Transmitter
The 100W4 is a two tube medium frequency transmitter with provision for pre-tuning to three frequencies in MF band and for type A1, A2 and A3 emission. For type...
RF field strength meter – Circuit Schematic
RF field strength meter
A very simple Field Strength Meter composed of a small antenna, a detector diode, a resistor, capacitor and a Micro Ammeter. Assuming that this simple circuit w...