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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      
U-Z

Last Updated on:
Thursday, April 07, 2016 01:02 PM


Circuits Designed by Dave Johnson, P.E. :
  • 175Khz Inductive Pulse Transmitter -  This circuit is discussed in more detail in the Experimenters Journal. The transmitter’s six-inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]

100Khz Crystal Calibrator -  There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The problem of dial calibration is complicated by the non-linear effects of tuning capacitors. This month's circuit is a 100Khz crystal calibrator using an inexpensive microprocessor crystal and CMOS IC's which are readily available at Radio Shack. . .  [Radio Amateur Society of Norwich]

100W FM Amplifier -  This Power amplifier is equipped with a bipolar transistor, the famous MRF317 As lots of FM amplifier application , the power transistor is in a C class bias. All the impedance networks (Input & Output) have been determined by using the. . .  [Michel P's website]

100W HF QRO linear Amplifier with Motorola MRF454 -  Schematic only, no circuit description. . .  [© 2001 - YO5OFH, Csaba Gajdos]

10BaseT Ethernet 10GHz BPSK link -  I don't know where to start on this one as it is still many single bits and bobs floating around that are still lacking other bits to bring the whole thing together. The idea that has emerged so far is to use an Ethernet card with a 10BaseT connection (kept short) to a modem which converts the signal to BPSK. For the moment no synchronization is done, and the whole Manchester encoded data with the link pulse is modulated to 480 MHz band using BPSK. The receiver is to be a simple 70 MHz BPSK demodulator regaining the carrier with a frequency doubler. Receive IF is therefor 70 MHz with 40 MHz bandwidth using a converted LNB (more on this later). A UHF / VHF splitterb combiner ensures that a single coax cable can be used to connect the RF link part to the modem. The RF link is currently a 45 cm Cassegrain antenna. A feed with OMT splits horizontal and vertical signals. The transmitter is a 10 GHz G3WDG003 upconverter by Petra Suckling G4KGC and Charles Suckling G3WDG (find out more here). . . .  [Edward John Cardew]
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

10GHz RS232 high speed link using FM -  The poor man's high speed microwave link. Still working on this. It uses a XC9536 CPLD to link to a serial line, this chip has a built in UART, differential encoder/decoder and a manchester encoder and decoder. It just fits in a simple 36 block device but I am still battleing with the FM decoder which is to be as simple as possible. Favoured project is the DVB IP Gateway so this one has moved to the rear end of my priority list. (Sorry). . .  [Edward John Cardew]

10mW FM Transmitter Project -  This type PCB is the same style of design used on the 7 Watt FM Transmitter. Take a look at the digital snap shot on the 7 Watt webpage. Notice on that picture. all of the components that are soldered onto the copper. both the components and copper are on the same side of the PCB. I decided to use this style as it was very quick and easy to change out components. during the many months of experimentation. So, there are no holes to be drilled on the PCB, except for the four mounting holes. . . .  [braincambre500 AT yahoo.com]

10W 2M CW transmitter -  I use this simple CW transmitter for working through the RS13 satellite. Using just 10 Watts and a dipole at 3M above ground, I have made many contacts around Europe and across the Atlantic. . .  [EI9GQ homebrew radio]

10W HF Amplifier with KT907 -  Schematic only, no circuit description. . .  [© 2001 - YO5OFH, Csaba Gajdos]

10W HF Linear Amplifier -  This project and your efforts will provide you with a 0. 55. . . 3 watt input to easily 10 watt output. The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply. The design is a good balance between output power, physical size. The completed amplifier will reward the builder with a clean, more powerful output signal for a QRP rig when radio conditions become marginal. It has a RF-sensing circuit (Q2) wich allows the amplifier to switch on automatically when transmitting. This project uses a "classic" RF transistor. MOSFET power amplifiers are discussed and build in the near future on this website. . . .  [(c)1999-2013 Guy Roels ON6MU]

115200 RS232 QPSK RF modem project -  QPSK modulation / demodulation project . . .  [Edward John Cardew]

1296MHz high gain Amplifier -  Schematic only, no circuit description. . .  [© 2001 - YO5OFH, Csaba Gajdos]

13.8V 30-40A Power Supply -  A powerfull power supply for my amateur radio equipment using four HEX FET transistors for regulation (made in May - July 2005). . .  [Bjarke Korsgaard's website]

1300MHz-1500MHz transmitter with 20-50mW output power -  Schematic only, no circuit description. . .  [designer not identified]

13cm power Amplifier -  Schematic only, no circuit description. . .  [© 2001 - YO5OFH, Csaba Gajdos]

144.000 Mhz CW Transmitter -  The Xtal osc is riped from an old AT-PC running 16MHz, it requeres 5. 0 volt and use 18mA
those Xtal oscilators is accurate and needs no adjustment
The 5. 0Volt 7805 regulator can also be ripped from the same old PC, then this transmitter, can be created for nomoney at all!  The CW-Keying is done by turning the PA-stage on or off with a P-channel FET or a PNP transistor
The PA transistor (2N4427) gets a bit hot, this can be solved by incerting a resistor in the collector/powersupply, to reduse output to about 800mWatt. . . .  [Thomas Scherrer, oz2cpu]

15 watt FM transmitter -  This is a powerful FM transmitter with 5 RF stages for greater stability and trouble free operation. The final output transistor is a Philips BLY 88 that delivers 15 Watts on the air. Modulation is achieved by using a varicap diode in the first RF stage for even better results. Like all of the high-power transmitter kits in this series, it comes pre-assembled and you only have to make the external connection. . .  [QUASAR ELECTRONICS LIMITED]

150mW FM Transmitter -  f you have got this far then you have already seen my V7 VHF FM Transmitter for the 88MHz to 108MHz broadcast band. That transmitter is "generic" in that the article was designed to be the source for other transmitters in the same area, perhaps for the 72MHz or 144MHz amateur bands using NBFM. 88-108MHz just happened to be somewhere in the middle. So what does the V7b have?. . .  [from Harry Lythall's website]

15dB UHF TV Antenna Booster -  This is an UHF band TV antenna preamplifier circuit With 15dB gain to build easily. It is formed based on BF180 UHF Transistor. The first stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second stage is a base-common. . . 

15W FM-transmitter -  Building a good fm-transmitter (88-110Mhz) begins with getting a good schematic. You don't have to understand the precise working of the transmitter to build it. But some basic information won't harm. A transmitter alone is, as you probably know, is not. . .  [by IQ Technologies Industry, unless otherwise noted online]

175Khz Inductive Pulse Transmitter -  This circuit is discussed in more detail in the Experimenters Journal. The transmitter’s six-inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below . . . [Hobby Circuit designed by David Johnson P.E.,  06/27/00]

1GHZ Frequency Meter -  This is 1GHz frequency counter with 100KHz resolution. Meter is built in around PIC16F84A microcontroller and SAB6456 / U813BS prescaller. . . 

1-transistor FM Transmitter -  A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulatessignal and acts as an oscillator. L1 and C5 determinefrequency. Decrease C5 for a higher frequency and vice-versa. You won't get a long range transmission with this one. . .  [Designer's name not given]

1W HF QRP -  Schematic only, no circuit description. . .  [© 2001 - YO5OFH, Csaba Gajdos]

1W Linear FM Booster -  This RF Amplifier is used for boosting small fm transmiters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance but the transistors will be burned much earlier than usual. ! In any case do not exceed the 15Volts. The Amp offers 15 dB in the area of 80Mhz to 110 Mhz. L4, L5, and L6 are 5mm diameter air coils, 8 turns, with wire 1mm wire diameter. An easy project, with great results. . . 

1W Portable PLL transmitter -  This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the parts are placed on one circuit board. The RF power is switchable between 1W and 0, 2W. . . 

1W RF Power Amplifier for iPOD Stereo FM transmitters -  This map, armored also enables automatic MONO / MPX through a low-pass filter, even with a multiplex on its entry by using an ON / ON, panning, the whole spectrum MPX more RDS is sent to the synthesizer, on the other hand when it is in a position MONO, the low-pass filter is activated and share its cutoff frequency at 15 KHz, only modulation G + D is sent to the synthesizer, as 19 KHz. 19 KHz carrier, the signal multiplex and subcarrier 57 KHz is thereby eliminated, . . . 

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Transmitter Circuits
Transmitters:  #'s       A-C       D-G       H-Q       R-T      
U-Z


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