The M15m Tracking Transmitter is a modified version of the M15 Animal Tracking Transmitter. It has been designed to be used on 147. 460 MHz using an inexpensive 49. 152 computer crystal and for printed circuit board construction. The M15m transmitter is a crystal controlled on-off-carrier (OOC) transmitter designed for model rockets but suitable for
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wildlife, balloons and many other applications requiring a small, frequency stable transmitter. The transmitter works best with a receiver that has CW mode, however an FM receiver or scanner can be used if it has a S meter which can be observed during operation. Transmitter ground range is approximately 400 yards (5 feet above ground)*. Battery life is approximately 30 days of continuous operation. Air to ground transmission range can be substantially greater than ground-to-ground range. Also the range can be increased significantly by using a directional high gain antenna or a more sensitive receiver. Field tests and range measurements were done with a ICOM IC-W32A transceiver with 0. 16 micro volts of receiver sensitivity through the standard 8 inch antenna. 30 days (#394, 1. 5 volt silver oxide watch battery) Recommended Receiver requirements: 144. 455 - 147. 460 MHz. , 0. 16microvolts sensitivity or better CW mode preferred for audio or can use S-meter on FM radio, 2-meter amateur radio, and some scanners. Receiver Antenna: directional antenna recommended but not required. Other: Knowledge of radio direction finding The transmitter is a crystal controlled 147. 460 MHz transmitter. The transmitter turns on and off at a ½ to 1 second interval. The circuit is designed to use a low cost computer crystal 49. 39 Mhz (3rd over tone), However, custom crystals can be used if other frequencies are desired. If other frequencies...
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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