The antenna used for either receiving or transmitting is a vital element in the communication link. In most cases the antenna has a great deal to do with how well the receiver or transmitter works. Antennas are reciprocal, meaning that an antenna designed for transmitting will work for receiving. A passive receiving antenna will also work for tran
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smitting. BUT the goals are different for reception and transmission. In general a receiving antenna should provide a good signal to noise ratio. In general a transmitting antenna should radiate energy as efficiently as possible in the direction of the receiver. A loop may make a great receiving antenna for a broadcast band radio but would be terrible as a transmitting antenna. Transmitting into an active receive antenna will let the smoke out of it. The B&W Broadband Folded Dipole Antennas ( ASW-90 ) U. S. Patent 4423423 is an excellent receiving antenna for broad band signals like chirp sounders. This design is also called a T2FD. The efficiency for transmission goes down rapidly below 40 meters. Hy-Gain HA-4000, 18TD, Collins TD-1, 637T-2 - a dipole made with two steel tape measures as the center part. You pull out the tapes, marked in the metric system and you`re good to go 637T-2 has two reels with antenna wire on each. Center support hole on top and type N(f) connector on the bottom. Used to quickly and easily make a dipole for NVIS ops. GRC-106 15 foot whip - photo - in CW-206 bag - Fair was selling these as a GRA-50, but they are for some transmitting application because of the insulating sleeve for the lower whip (ms-11x whip sections. Not the receive only antenna for the R-442. ) Tape Whip Adapter - Accepts 5/16-24 male thread on mil antennas and screws into 3/8-24 ham, CB, commercial antenna bases. The 5/16-24...
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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