5 watt, 80 meter QRP CW Transceiver
1. Full 5 watt output using a power MOSFET final that is resistant to high SWR and thermal runaway. This final is very efficient and runs much cooler than tr...
14MHz SSB 10mW transceiver
The whole Construction : You can call the transceiver like this as "OZL type". Characteristics of the "OZL type" are as follows.
1. Single conversion super.
2...
5 tubes QRP SSB Transceiver for 20m ham band
This true SSB transceiver is built around just 5 vacuum tubes, with no transistors nor ICs. Superhet receiver with AGC and S-meter drives a loudspeaker, 5W tran...
TV and FM jammer schematic
The Jammer is a very small circuit and can fit inside a small plastic box with 9V battery inside. It can be very illegal if you attach an external antenna so do...
TV and FM jammer schematic
The Jammer is a very small circuit and can fit inside a small plastic box with 9V battery inside. It can be very illegal if you attach an external antenna so do...
FM surveillance BuG Transmitter
The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current...
FM surveillance BuG Transmitter
The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current...
2 Watts FM transmitter
This is a nice 2 Watts FM transmitter. It has a Super-Sensitive pre-amplification with BC109 and BC177 with more than 100% signal modulation. The job finish the...
2 Watts FM transmitter
This is a nice 2 Watts FM transmitter. It has a Super-Sensitive pre-amplification with BC109 and BC177 with more than 100% signal modulation. The job finish the...
1W Linear FM Booster
That RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear...
1W Linear FM Booster
That RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear...
6 x 6 Loop Antenna
This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, ...
6 x 6 Loop Antenna
This new loop antenna by Graham Maynard is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, ...
antenna tuner for better DX
Almost any receiver covering 540 kHz to 1600 kHz is suitable for broadcast band DX`ing, and there are a lot of them. But the antenna is another matter. If you a...
antenna tuner for better DX
Almost any receiver covering 540 kHz to 1600 kHz is suitable for broadcast band DX`ing, and there are a lot of them. But the antenna is another matter. If you a...
AM LOOP ANTENNAS
An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor c...
AM LOOP ANTENNAS
An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor c...
Antennas for HAM transmitters
Antenna is the means by which a wireless operator puts his signal into the space and also through which he picks up the signals of the stations with which he wa...
Antennas for HAM transmitters
Antenna is the means by which a wireless operator puts his signal into the space and also through which he picks up the signals of the stations with which he wa...
Ground pole & 2-Half-Wave Dipole Antenna
This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna The body of car serves...