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Pll Fm Radio Transmitter Circuit Schematic – Circuit Schematic
Pll Fm Radio Transmitter Circuit Schematic
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low noise receive aerial – Circuit Schematic
low noise receive aerial
This afternoon I have returned to 10m WSPR. There are lots of transatlantic reports of my signal, as well as reports of my 2W signal from Russia and Brazil. Sac...
Amatorki projekt – Circuit Schematic
Amatorki projekt
Add to our circuit despreading spectrum 2 identical branches more. Difference is only in phase of PN sequences given to each branch (to input of double-balanced...
Voice link over spread spectrum radio – Circuit Schematic
Voice link over spread spectrum radio
Communication systems using spread spectrum techniques, compare to narrow-band systems are more resistant for noises, signal fading, Doppler effect. Because of ...
Simple Transmitter – Circuit Schematic
Simple Transmitter
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Domestic VLF Reception – Circuit Schematic
Domestic VLF Reception
Traditionally, high quality reception of VLF natural radio signals has involved driving or hiking out to remote locations far from civilisation, in order to fin...
RCA BC-224-A - the First BC-348 – Circuit Schematic
RCA BC-224-A - the First BC-348
The mid to late 1930s reflected a curious mixture of old and new thinking in aircraft radios, led by brilliant engineers in such companies as Aircraft Radio Cor...
A Simple 80M Direct Conversion Receiver – Circuit Schematic
A Simple 80M Direct Conversion Receiver
A few weeks ago, Jason NT7S mentioned the ZL2BMI DSB transceiver as a rig I might be interested in building. He was right - I had seen it in SPRAT but for some ...
Dave Richards AA7EE – Circuit Schematic
Dave Richards AA7EE
As a follow-up to the previous post, in which I discovered that the Sony SRF-59, though cheap to purchase, offered surprisingly good performance due to a rather...
Sputnik QSO Party Transmitter Prototype – Circuit Schematic
Sputnik QSO Party Transmitter Prototype
Here is my Sputnik QSO Party transmitter prototype. The RF output power is 450mW with 70Vdc @ 14. 4mA on the V2 anode. The V2 screen (G2) current is 1. 6mA. The...
PA1B-02 page of VERON department Nieuwegein and surroundings – Circuit Schematic
PA1B-02 page of VERON department Nieuwegein and surroundings
Information for the radio broadcast and listening amateur in VERON department Nieuwegein (A29) and surroundings....
radio transmission to get the GPS data – Circuit Schematic
radio transmission to get the GPS data
The balloon went to 103, 258 ft peak reported altitude. Many items had to be considered for launching payload to this range. Unlike building an electronics pack...
High Power Portable TV and FM Jammer circuit – Circuit Schematic
High Power Portable TV and FM Jammer circuit
There are still neighbors that keep annoying you by having loud the TV or the radio? Well I have you the solution. In fact all neighborhood will face your jammi...
High power mobile phone Jammer circuit – Circuit Schematic
High power mobile phone Jammer circuit
** UPDATED 2014 ** This project is the original High power mobile phone Jammer circuit, and all updates are posted here. All other versions are just copied from...
Doppler Ultrasound Receiver Circuit – Circuit Schematic
Doppler Ultrasound Receiver Circuit
XTAL1 drives amplifier Q3/Q4, which is tuned to 2.25 MHz. The detected signal is fed to audio amplifier ICl. A 9-V supply is used....
Doppler Ultrasound Transmitter Circuit – Circuit Schematic
Doppler Ultrasound Transmitter Circuit
The 2.25-MHz.osciJlator Ql drives amplifier Q2 and XTAL1, an ultrasonic transducer. The transducer is a lead zireonate-titanate type. ...
20M Cw Transmitter Circuit – Circuit Schematic
20M Cw Transmitter Circuit
The transmitter has a VXO circuit to drive an amplifier that is keyed. The keyed amplifier drives an MRF 476 final amplifier, which delivers about 2-W output. ...
Fm Radio Transmitter Circuit – Circuit Schematic
Fm Radio Transmitter Circuit
An FM radio generates an interference signal that can be picked up on another FM radio tuned 10.7 MHz above the first one. The 50-k0 potentiometer adjusts the ...
40M Cw Transmitter Circuit – Circuit Schematic
40M Cw Transmitter Circuit
This CW transmitter has an output of up to 3 W. By using 24 V on Q2, up to 10 W output can be obtained. If a 24-V supply is used, Ql must not see more than 12 ...
10M Dsb Transmitter Circuit – Circuit Schematic
10M Dsb Transmitter Circuit
A DSB transmitter is much cheaper to build than an SSB transmitter because no filter or phasing networks are required. This circuit produces up to 1-W output o...