This web page describes the radio transmitter unit that flew aboard the Cirrus One rocket in April 2001. The intent of including the transmitter as payload was to: As the Cirrus One rocket was expected to achieve an altitude that would be well out of visual range at 10, 000 feet (3 km. ), it was felt that there could be recovery difficulties if the
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wind (if present at launch) would carry the rocket far downrange. Since the altimeter that also flew with the rocket was expected to generate a continous audible "beeping" code once peak altitude was achieved, this sound could be picked up by the transmitter and effectively act as a homing beacon*. Although of secondary importance, it was felt that it might be advantageous to receive the altimeter signal of peak altitude while the rocket was still in flight. just in case the recovery system should fail to function properly, or if the rocket was to be otherwise lost. This was my first try at having a transmitter as payload, and I felt that an FRS radio might be a practical, simple, and inexpensive solution that could be implemented within the short timeframe that was available prior to the launch event. * As it turned out, a software bug dictated last-minute replacement of the altimeter`s PIC chip with one with updated software, which, unfortunately, provided for only a one time, rather than continous, audible broadcast of the coded peak altitude. The transmitter unit was an essentially unaltered FRS radio transceiver. These inexpensive units, which operate at a frequency band of, 462. 5625 MHz to 467. 7125 MHz, have an advertised range of 2 miles (3. 2 km. ). The unit that I used was a Panasonic "Talkabout FR50", with 14 channels, and cost about $30 CAD. The only modifications to the unit involved stripping away the case...
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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