This page is oriented towards the USA marketed radios, simply because it was compiled by USA residents; we described the radios we are familiar with. If anyone would care to share information on the non-USA radios we`d be happy to add them on this page, or even create a region-specific page. The MaxTrac, Radius and GM300 series fathered additional
Click here to download the full size of the above Circuit.
radio designs that are/were sold all over the world, and the products were customized for the local marketplace with region-specific model numbers. As one example the UK/European region has models that are never seen in the USA (like the GM900), and the Australian market has models that are never seen in Europe or the USA. As one specific example of non-local radios, Moto Australia makes 64channel Radius mobiles and 16channel GP300 handhelds that cover 220-240MHz for the Asian market (specifically the Philippines). Those radios would be very popular in the USA Amateur market for the 219-225Mhz band. If anyone has a way to bring them into the USA, even in small quantities, that would be interesting as well. just contact the author. 1) No matter WHAT the model tag says, no MaxTrac, Radius, M-series or GM300 mobile will ever operate over the entire frequency range listed on its model tag/label. Each unit will do only a portion of that model tag frequency spread, called a "split", a "bandsplit" or a "range". This is due to the design, and the design follows the laws of physics. In short, if you buy the wrong range radio for your application (one example is a GM300 built for 490-520MHz and you want to use it on a 462MHz GMRS frequency) you will have a nice doorstop. It is not practical to range-change a MaxTrac, Radius, or GM300 series radio. On the MaxTrac (which includes the Maxtrac 50 and Maxtrac 300 models), the Radius...
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.....
characters left: