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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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CODING EQUIPMENT sa RADIOTELETYPE x KEY (TELEGRAPH) x TELEGRAPH KEY xx CODING Pocket-size code keyer. Features two transistors and a variable frequency. Use with any standard key. Battery-powered code blinker. Night time Morse code signal light uses two D-size flashlight batteries and a simple key. Send messages with this telegraph system you make yourself. It consists of two simple sending and receiving units connected together with wire and powered by a 9-volt battery. An ultra-smooth ball bearing keyer paddle which is designed for squeeze keying and will provide the velvet smooth action characteristic of the best commercial keyers. Circuit for a code practice oscillator for use with a paddle key. Battery powered. Est. cost: under $10. Build your own MP-80 Morse code keyer. Part 1. Basic theory of operation for this microprocessor-controlled keyer. Build your own MP-80 Morse code keyer. Part 2. Construction. Est. cost: $99 for kit (excluding keyboard & power supply). Build your own MP-80 Morse code keyer. Part 3. Programming and operating. Aku-Touch. A single polarity, solid-state, body-capacity operated "touch" paddle-control for the CMOS "Accu-Keyer" described in the Jan 1976 issue. Modify the Nye telegraph key for simple c.w. operation. Electronic keyer uses 9 ICs which are locally available. The unit is compact enough to be used in portable operation via a 9 volt battery. How to convert the Heath HD-1416 code practice oscillator into an electronic keyer. A polarity-reversing circuit for a keyer. Est. cost: $2. Combination code-practice source and iambic digital keyer unit is built around the Micro Digital Technology CPP1 microcomputer chip. Est. cost: $45. How to improve the Vibroplex EK-1 "Brass Racer" keyer. How to build a super simple keying moniter which utilizes a piezoelectric buzzer. Adding touch control to your Vibroplex EK-1 "Brass Racer" keyer. Paddle and keyer. Notes on current amateur CW technique. How to use both iambic and non-iambic techniques. How to build an instant in-line inverter for your negative electronic key (such as the Vibroplex EK-1). Morse box tone converter. This battery-powered unit interfaces your transceiver's audio output and a telegraph sounder. How to build a junk-box iambic paddle key. Adjustment screws give micrometer precision in setting contact spacing. How to build your own mini hand key. Morse code generator uses the 8748 microcontroller IC to automatically send a programmed CW message. Use it to run a beacon or ID a repeater. How to adjust the semi-automatic telegraph key (bug) and use it on the air. Build your own Morse meter to gauge code speed. Calculates words-per-minute of transmitted or received Morse code. New life for old bugs. Quick and easy restoration process for semi-automatic code-sending keys. How to adjust a bug for great on-the-air operation. The mouse key. How to convert a computer "mouse" into an iambic keyer for sending code. Ergonomic improvement and adjustment of the Vibroplex Iambic paddle. Redesigned fingerpieces, shorter feet, and proper adjustment improve this well respected key. The tuppeny paddle. Build an iambic paddle keyer from two pennies, a spring clothes pin, a discarded ballpoint pen, scrap wood, and a few nuts, bolts, and washers. Improving the AEA Model MM-3 keyer. Increasing RF immunity, improving side-tone audio, and changing paddle voltage. CW (Morse code) filter. An add-on audio filter having a narrow bandwidth will improve CW reception. CW keying monitor. Simple practice key and buzzer. Key click filter eliminates RF spikes. Electronic keyer for clearness and speed. Cheap sideswiper for electronic keyer. Automatic CQ sender. Automatic code sender transmits what you type. Wireless CPO aids you in picking out signal from noise. CW keying monitor has pitch and volume control and is powered by your transmitted RF. Using a tape recorder to send out your CQ. One-tube electronic keyer produces perfect dahs and dits. Est. cost: $20. Code practice oscillator fits into a plastic aspirin bottle. Continuity tester has an audible alarm to indicate complete circuit. Can also be used as a code practice oscillator. Est. cost: $8. Beginner's code practice oscillator circuit. Circuit for a code practice oscillator. Code practice oscillator is quick and easy to build. There are four output jacks for feeding phones or speakers. Code practice oscillator circuit. Circuit for a simple code practice oscillator. Tone-modulated transmitter. Use it as a hidden transmitter for kids to track down using a portable radio. Use it as a code-practice oscillator. World's simplest code practice oscillator uses only a speaker, telephone carbon mike, battery and key. Code-practice oscillator circuit can also be used as a doorbell or continuity checker. Off-air keying monitor tells you what your morse signals really sound like to other hams. Code-practice oscillator circuit consists of only five components and feeds 8-ohm headphones. Sophisticated code practice oscillator has individually adjustable dit, dah and space duration controls. Works on a 6- or 9-volt battery. Est. cost: under $10. Build a code practice oscillator and paddle key, with automatic keying. Push the key one way to send dits and the other way to send dahs. The electronic circuitry will automatically send a string of either dits or dahs as long as you hold the paddle against the appropriate contact. Est. cost: $17. A multi-function oscillator circuit uses two transistors. Applications include a code-practice oscillator, lamp and LED flashers, audio oscillator, dc-to-dc upconverter, relay control, and pulse generator. Code-practice oscillator circuit utilizes a battery-powered piezoelectric sound generator to drive an external key and headphones. Transistor CPO circuit. Loudspeaker code practice oscillator from any receiver. Short-range CW transistorized transmitter doubles as a CPO. CPO features fluorescent lamp which lights. Two-transistor, multivibrator CPO circuit. Device converts blinker light signals into audible dots and dashes to get higher code speed and one-man operation. Tips on correct sending techniques with a key. Multi-master. Solid-state multivibrator module is used in this tester which generates a 1000-Hz tone, richly endowed with harmonics. Can be used as a signal generator, code practice oscillator, and continuity tester. Est. cost: $5. Compact, inexpensive keying monitor. Code practice oscillator uses two transistors. Batteryless CW monitor uses a code practice oscillator. Circuit for an inexpensive code practice oscillator. Basic blocking oscillator circuit can serve as (1) code practice oscillator, (2) continuity tester, (3) metronome, (4) audio test signal source, (5) alarm signal and (6) basic electronic organ. Circuit where switching arrangement allows wide-range relaxation oscillator to operate as (1) electronic organ, (2) metronome, (3) thermometer, (4) code practice oscillator, or (5) siren. Simple audio generator circuit can also be used as a code-practice oscillator or audio transistor tester by substitution. More circuits using the 555 IC timer include (1) tone generator, (2) code practice oscillator, (3) CW monitor and (4) electric-eye annunciator. General-purpose audio oscillator can serve as (1) a code-practice oscillator, (2) self-contained audio source for testing microphones and loudspeaker placement or (3) as a signal in an alarm system. Circuit for a low-cost beat oscillator that can attach to any AM-FM-Shortwave receiver. A simple electronic keyer for sending morse code. Features a variable speed rate and a side-tone oscillator with volume control. Morse-A-Letter decoder. This device automatically decodes Morse transmissions and displays them alphanumerically, one letter at a time. Est. cost: $120. The Morse-A-Word. Part 1. LED readout displays from 2 to 8 simultaneous letters or numbers when Morse code is received. Est. cost: $150 up. Theory and system operation. Morse-A-Word. Part 2. Construction, alignment and use. Build a Morse-A-Keyer. Part 1. Keyboarded messages are converted into perfectly formed Morse characters. Sidetone oscillator lets the user hear the generated Morse code. Est. cost: $70. Build a Morse-A-Keyer. Part 2. Ultrasonic CW transceiver makes learning Morse code more interesting. The transceiver operates up to 200 ft., requires no license, and has built-in features which simulate using a real amateur-radio transmitter. LED indicator circuits for all occasions. (1) AC pilot light. (2) DC pilot light. (3) Polarity indicator. (4) 5-volt voltage-level indicator. (5) Oscillator-driven flasher. (6) Decoder converts audio CW code into visual dots and dashes. Circuits based on the LM3909 oscillator/flasher IC. (1) Dual LED driver. (2) Tick circuit flashes an LED and gives out a sharp tick on a speaker. (3) Variable audio-frequency oscillator. (4) Electronic siren. (5) Code-practice oscillator. (6) AC lamp flasher. A mixed collection of practical 555-timer IC application circuits. (1) Schmitt-trigger converts sinewaves into squarewaves. (2) Dark-activated relay switch can control lighting. (3) Code-practice oscillator. (4) Electronic door buzzer. (5) LED flasher. (6) Long-period timers. Build a Sideswiper, the first of the high speed code keys. Using a single special-purpose IC (the ULN2429A fluid detector) in as many applications as possible. (1) Low-level liquid level detector. (2) High-level liquid level detector. (3) Touch-activated switch. (4) Proximity sensor. (5) Ultrasonic pest repeller. (6) Variable square-wave generator. (7) Code-practice oscillator. (8) Alarm circuit. (9) Light beam circuit (LED-emitter / phototransistor-sensor circuit). More ultrasonic circuits. (1) CW (Morse code) transmitter. (2) Motion detector. (3) Proximity detector. Versatile code practice oscillator circuit has a variable frequency and volume controls. Morse-code oscillator circuit. Code-practice oscillators. Five different circuits supplied. Ham radio code filter. An audio filter for making the Morse code station you want to hear stand out from those you don't. Versatile electronic keyer provides adjustable speed from 8 to 40 words per minute. A built-in monitor provides a clear side-tone to a speaker. Experimenting with the 4093 NAND Schmitt trigger. Circuits include oscillator, signal injector, fluorescent-light inverter, fluorescent flasher, Morse code sender, beep-tone generator, LED flasher, and timer. Circuit for an independent code-practice oscillator. A five-way radio breadboard includes a wireless mike, touch alarm, code transmitter, phono oscillator, and AM receiver. Make your own code practice oscillator from Mallory SC628 Sonalert sounder and a 9-volt battery. Circuit for simple Morse bug has a speed range from about 10 to 30 wpm. External beat frequency oscillator for use in copying from Morse code stations. DTMF (dual-tone multi-frequency) encoding and decoding. How to use "Touch-Tone" techniques to speed up signal transmission. All-electronic T/R switch for instant break-in during pauses in CW transmissions. You monitor your receiver all the time. Est. cost: $8. A modulator keying monitor and code practice oscillator. Est. cost: $5. Short-range AM transmitter for practicing Morse code transmitting. Est. cost: $4. Continuity tester can also be used as a code practice oscillator. Est. cost: $4. Simple code monitor has no electrical connection to equipment. It is triggered by a separate set of contacts activated by transmitter key. Wooden board with several battery holders and some wiring can serve as a low-voltage power supply, a continuity checker, a bulb tester, a code practice blinker, etc. Est. cost: $2. Battery-powered code monitor allows sender to hear the code being transmitted. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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