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Interfacing MaxTrac Mobile Radios to Repeater Controllers – Circuit Schematic
Interfacing MaxTrac Mobile Radios to Repeater Controllers
This article describes one reliable, simple, and universal method of interfacing MaxTrac, Radius, and GM300 series of Motorola mobile radios to common repeater ...
Interfacing MaxTrac Mobile Radios to Repeater Controllers – Circuit Schematic
Interfacing MaxTrac Mobile Radios to Repeater Controllers
This article describes one reliable, simple, and universal method of interfacing MaxTrac, Radius, and GM300 series of Motorola mobile radios to common repeater ...
HT600 HT600E HT800 MT1000 MTX800 MTX Classic MTX900 P200 – Circuit Schematic
HT600 HT600E HT800 MT1000 MTX800 MTX Classic MTX900 P200
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HT600 HT600E HT800 MT1000 MTX800 MTX Classic MTX900 P200 – Circuit Schematic
HT600 HT600E HT800 MT1000 MTX800 MTX Classic MTX900 P200
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Industry-Compatible intercom construction project – Circuit Schematic
Industry-Compatible intercom construction project
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High Impedance Amplified Telephone Line Tap – Circuit Schematic
High Impedance Amplified Telephone Line Tap
This is an amplified telephone line tap, which is designed to be minimally invasive. The interconnect to the phone line has a large input impedance, and is elec...
45 Years Anniversary of Walter Bruchs PAL Color Television – Circuit Schematic
45 Years Anniversary of Walter Bruchs PAL Color Television
This article celebrates in 2008 the 45 Years of the invention of PAL as well as to give an appriciation to the german television pioneer Prof. Dr. Eng. Walter B...
USB / CAT (CI-V) adapter – Circuit Schematic
USB / CAT (CI-V) adapter
Is based on the FTDI`s USB / serial IC FT-232BM. The adapter has been successfully tested with the following transceivers and software: VX-7R (VX-7R Commander),...
dtmf circuit – Circuit Schematic
dtmf circuit
This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL. The circuit supports DTMF squelch based on 3 digits station...
PTT Schematic – Circuit Schematic
PTT Schematic
Most modern transceivers have a built in interface. These interfaces work well in digital modes, but seem to lack support in analog voice modes. A case in point...
dtmf circuit – Circuit Schematic
dtmf circuit
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KB0PS ILink Station – Circuit Schematic
KB0PS ILink Station
The following is a layout of my repeater system and what was needed to get it on the air. The ILink system was designed by Graeme, M0CSH, and I take no credit f...
Icom IC-751 RAM reprogramming – Circuit Schematic
Icom IC-751 RAM reprogramming
Everything, it seemed, functioned normally. To me was pleased both half-duplex and work from the pedal in the telegraphic regime, when operator has the capabili...
MD-1142/UGC Modem Time Diversity BR Communications 6029C Time Diversity Modem – Circuit Schematic
MD-1142/UGC Modem Time Diversity BR Communications 6029C Time Diversity Modem
BR Communications (later merged with TCI to become TCI/BR, later bought by Dielectric Inc ) makes a line of chirp sounder transmitters and receivers. See my RCS...
Most Accurate Clock – Circuit Schematic
Most Accurate Clock
I built one of these with the RS-232 option many decades ago. It a three channel HF receiver (5, 10 & 15 MHz) that receives either the U. S. or Hawaii WWVH time...
MFM Encoder – Circuit Schematic
MFM Encoder
A MFM Encoder works according to the principle of time shifting and phase shifting. This method is based on the transmitting frequency and the MFM signals are g...
Phones – Circuit Schematic
Phones
Working on strowger phone exchanges involves a lot of soldering, but unlike modern electronics, you can`t use a fancy temperature controlled soldering station, ...
Data Receiver – Circuit Schematic
Data Receiver
Always use shielded LWDAQ Cable to connect the A3018 to the LWDAQ Driver, not Ethernet cables. The shielding stops the cable acting like a radio-frequency anten...
the Open GPS Tracker – Circuit Schematic
the Open GPS Tracker
The tracker is easy to build on a perfboard. I used a basic one-pad-per-hole perfboard and 26-gauge wire, but 30-gauge would probably be better. All the electro...
Small Breakout for SIM900 GSM Module – Circuit Schematic
Small Breakout for SIM900 GSM Module
The printed circuit board, has a pin strips (10 pin x 2) used to connect with the circuit board of the remote control device. The pin 1 (ON/OFF) is used by a mi...