User manual RAMSEY ABM1WT

[. . . ] PASSIVE AIR BAND MONITOR Ramsey Electronics Model No. ABM1WT Imagine monitoring the entire 118 to 136 MHz Aircraft band with no tuning!Then imagine being able to bring your receiver onboard aircraft to hear what's going on and not having to worry about interference!This monitor give you access to air traffic signals from aircraft and airports . [. . . ] C26 and R12 are used to prevent the amplifier from oscillating. L2 acts as a low impedance for audio allowing it to pass to J1 and on to the headphones. 118-136 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. You'll hear any aircraft you can see, PLUS planes up to ten miles away and more, since VHF signals travel "line of sight. " An airliner at 35, 000 feet altitude 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 services in the NAS (National Airspace System) with which pilots communicate: Clearance Delivery At most metropolitan airports, a pilot communicates with the FAA on a frequency called "Clearance Delivery" to obtain approval or clearance of the intended flight plan. This communication is done before contacting ground control for taxi instructions. Ground Control From the control tower, ground movements on ramps and taxiways are handled on the "Ground Control" frequency. Control Tower Runway and in-flight maneuvers near the airport usually within three miles (takeoffs, local traffic patterns, final approaches and landings) are on the "Control Tower" frequency. ATIS ­ Automated Terminal Information System ABM1 · 6 ATIS, is a repeated broadcast about basic weather information, runways in use, and any special information such as closed taxiways or runways. ASOS/AWOS ­ Automated Surface Observing System/Automated Weather Observing System This system is similar to ATIS but usually located at un-towered airports. Approach Control & Departure Control These air traffic radar controllers coordinate all flight operations in the vicinity of busy metropolitan airport areas. ARTCC ­ Air Route Traffic Control Center When you hear a pilot talking with "Jacksonville Center" or "Indianapolis Center", you know the aircraft is really en route on a flight rather than just leaving or just approaching a destination. A pilot will be in touch with several different "Regional Centers" during a cross-country flight. CTAF ­ Common Traffic Advisory Frequency Airports without control towers are controlled by the pilots themselves and they rely on the local CTAF frequency dedicated only to advisory communications between pilots and ground personnel such as fuel service operators. The people on the ground can advise the pilot on the status of incoming or outgoing aircraft, but the pilot remains responsible for landing and takeoff decisions. Typical CTAF frequencies are 122. 7, 122. 8 and 123. 0 MHz. Unicom frequencies used at manned, towered airports for day to day business are 122. 75, 122. 85, and 122. 95 MHz. FSS - FAA Flight Service Stations The FAA's network of Flight Service Stations keeps track of flight plans and provides weather briefings and other services to pilots. [. . . ] If you're missing five 10K ohm resistors and received five extra 1K resistors, you can pretty much be assured that the '1K ohm' resistors are actually the 'missing' 10 K parts ("Hum-m-m, I guess the 'red' band really does look orange!") Ramsey Electronics project kits are packed with pride in the USA. If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey, please write or call us with information on the part you need and proof of kit purchase. FACTORY REPAIR OF ASSEMBLED KITS: To qualify for Ramsey Electronics factory repair, kits MUST: 1. NOT be assembled with acid core solder or flux. [. . . ]