No matter WHAT the label on the radio (or the seller) says, no Spectra will ever operate over the entire 136-174MHz (high band) or 403-512MHz (UHF) frequency range. Each unit will do only a portion of that band`s frequency spread, and that portion is called a `split`, a `bandsplit` or a `range`. You can stretch things a little and go a megahertz or maybe two
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out of range and that`s about it. If you buy the wrong range radio for your application (for example a 403-433MHz and you want to use it on 440-450MHz amateur frequencies, or a 482-512MHz radio for GMRS) it just won`t work and you will have a nice doorstop. Despite what you see on eBay there is not (and never was) a 406-440MHz range. And it is not practical to range-change a Spectra radio. For more information scroll down to the section titled "Splits/ Ranges". Another note: Spectras are wideband only (+/- 5 KHz except on 900 MHz). Yes, the 900MHz band has been 2. 5KHz (narrowband) since the beginning. You probably could hack and slash at a Spectra and make it to where it would work in a narrowband environment, but it would be narrow only, not switchable. Plus it would not be type accepted and would not be legal. If you need a narrowband radio and want to stick with the Spectra line then you will have to find an AstroSpectra. The Spectra line was MD`d (Manufacture Discontinued) a few years ago, and depot maintenance was terminated recently. Many public safety agencies nationwide are being forced into new radios (if they stay with Motorola it`s usually the MCS2000 series) and the Spectras are showing up in surplus in large quantities. Due to the fact that the "narrowband" units are what is considered today as wideband they will be illegal to use in commercial and public safety use when the narrownand rules go into effect....
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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