Even though this CW transmitter circuit was published in 1955 in Popular Electronics, it is still legal for today`s Amateur radio operator. Portions of the 40-meter and 80-meter bands are still reserved exclusively for CW operation. As of 2011 in the 40-meter band 7. 025 - 7. 125 MHz, and for 80-meters 3. 525 - 3. 600 MHz are reserved for CW for Hams holding either Novice (no longer issued) or Technician licenses.
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That is different than the frequencies given in the article, so beware if you are tempted to throw one together for old time`s sake. The value for XTAL will need to be changed accordingly. Both bands are a bit lower than shown here, so you might need to tweak the tuning elements a tad as well. If you are not a designer, you would be better off just finding a newer circuit that is already configured for the new bands. The beginner in ham radio with a novice license should become active as quickly as possible with a low-powered telegraph (CW) transmitter. Operating this rig as often as he can will give valuable on-the-air experience in handling the code and in correct operating procedure. The best way to learn is by doing. A novice`s first transmitter should be both simple and inexpensive. A good idea is to use the lower frequency bands. There, the new operator usually will find more "rag chewers" and local contacts than on the higher frequency long-distance bands. In the 80-meter band, novice CW operation is permitted between 3700 and 3750 kc. In the 40-meter band, the novice`s territory is 7175 to 7200 kc. Crystal control must be used. The transmitter shown here was made especially for beginners. While it is low-powered, it will give a good account of itself when operated with a good antenna. It does not take up much room, since it is built on an aluminum radio chassis box (Bender Type 145) 7" long, 5" wide, and 3" high....
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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