Ramsey Electronics AM25 Manual de Instruções descarregar pdf (Página 4)

AR1 • 4

INTRODUCTION TO THE AR1 AVIATION RECEIVER KIT

The Ramsey AR1 Aviation Receiver is characterized by exceptional sensitivity,

image rejection, signal-to-noise ratio and stability, all at economical Ramsey

Kit pricing. It is designed for casual "listening in"- both ground and air

communication, for both commercial airlines and general aviation. If you build

and adjust the AR1 correctly, it will give you years of easy sky-monitoring

enjoyment. Even without using the squelch, you will find it to have much less

background noise than many units costing much more money. This kit project

is especially good for people with an interest in learning more about both

Aviation and Electronics. We consider it "easy" to build, but it is definitely not a

simple short-evening project like many of our other kits. If your first interest is

airplanes, and you're just getting into electronics, please study this manual

completely before starting out. The "once over" will temper the jump-in

enthusiasm and help you understand the task at hand. The AR1 has been built

by folks of all ages and skill levels, and in less time than it takes to fly solo!

118-135 MHz, WHAT YOU CAN EXPECT TO HEAR

A basic fact about the VHF Aviation Band which even licensed pilots can

overlook or forget is that communications are in the AM mode, not FM, as in

the case of the FM broadcast band immediately below it, and the VHF public

service and ham bands immediately above it.

No matter where you live, you will be able to receive at least the airborne side

of many air traffic communications. If you know where to tune, you'll hear any

aircraft you can see, PLUS planes a hundred miles away and more, since VHF

signals travel "line of sight." An airliner at 35,000 feet altitude in the next state

is still line of sight to your antenna. Similarly, whatever ground stations you

may hear are also determined by this "line of sight" character of VHF

communication. If there are no major obstacles between your antenna and an

airport (tall buildings, hills, etc.), you'll be able to hear both sides of many kinds

of aviation communication. Be prepared for them to be fast and to the point,

and for the same airplane to move to several different frequencies in the span

of a few minutes! Here's a brief listing of the most common types of ground

services with which pilots communicate:

• Control Tower

• Ground Control

• Clearance Delivery

• ATIS

At most metropolitan airports, a pilot communicates with the FAA on a

frequency called "Clearance Delivery" to obtain approval or clearance of the

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Ramsey Electronics AM25 Manual de Instruções Página 4