Any good websites that explain each CDI or ADF in detail?
2006-12-23 07:19:03 · 8 answers · asked by Aaron C 3 in Cars & Transportation ➔ Aircraft
The CDi is your coarse deviation indicator... It is usually part of an HSI ... It is designed to stay on a selected coarse. This information may come from VOR, FMS, or may in some cases act as your left right for the ILS (instrument landing system).
The ADF is typically seen on the RMI. It works of a simple principle, and causes the needle on the RMI to point in the direction of the radio station (ADF) that is tuned in. And since the ADF works in the AM radio spectrum... you can hear the ball game too.
2006-12-23 07:48:07 · answer #1 · answered by Dport 3 · 3⤊ 0⤋
Easy answer, an ADF is an Automatic Direction Finder and is the receiver and bearing detection equipment in the aircraft, a NDB is a Non Directional Beacon and is the transmitter on the ground that the ADF receives. NDBs generally transmit from 200 to 500 Khz (kilohertz). Most ADFs will receive from 200 thru 1700 Khz so they will receive both NDB stations and conventional AM broadcast stations. Contrary to what anyone has said they will not receive VOR or ILS stations. Those transmit from 108.00 thru 117.95 Mhz (108000 thru 117950 Khz) a totally different band using a different receiver. . What some are probably referring to is an ADF being displayed on a different kind of indicator called an RMI (Radio Magnetic Indicator). This indicator takes the place of an ordinary ADF indicator and has its compass card slaved to the heading system and has 1 or 2 needles which can be used to "point" to an NDB if switched to the ADF or a VOR station if selected to a VHF VOR/ LOC (VOR/Localizer) receiver. In no case will it point to a Localizer or ILS station those use a totally different modulation scheme and only indicate left or right of a runway centerline. ---Sorry for the long explanation, have been in avionics for 40+ years its a somewhat complicated subject if you dig deep enough, the simple answer is the first sentence.
2016-05-23 02:12:14 · answer #2 · answered by Anonymous · 0⤊ 0⤋
two totally different things.
An ADF is in the plane and works with and NDB on the ground.
When using these the needle always points to the station you are tuned into.
A CDI is on the plane and it works with a VOR on the ground.
A CDI allows you to select one of 360 radials emmitting from the VOR and track inbound or outbound on them.
And you can listen to AM radio through the ADF tuner when you arent using it.
2006-12-27 06:48:12 · answer #3 · answered by Anonymous · 0⤊ 0⤋
ADF is a radio used in navigation. When it is tuned to an AM radio or NDB station, direction to the station is indicated on the CDI.
2006-12-26 07:09:22 · answer #4 · answered by eferrell01 7 · 0⤊ 0⤋
Let me add that the ADF needle / pointer simply points to the station. NDB's broadcast on AM frequencies.
With a CDI, you can select the bearing to / from the station you wish to be on, and the indicator will tell you if you're left, right, or on course...and by how many degrees. VOR's broadcast on VHF frequencies.
2006-12-23 10:28:36 · answer #5 · answered by 4999_Basque 6 · 0⤊ 0⤋
No, An ADF is a low frequency navagation instrument that does not require a direct line of sight , A CDI is a bar such as on a VOR to indicate if you are on coarse.
http://www.pilotfriend.com/training/flight_training/nav/navigation.htm
2006-12-23 07:38:11 · answer #6 · answered by The Steve 2 · 0⤊ 0⤋
No, they're different.
IMHO, the ADF is not the most accurate instrument (especially in close).
To me, the only advantage is if you know EXACTLY where an AM station's antenna is, you can tune to it and listen to talk radio on your way in. JUST KIDDING! Do't try this one at home!
2006-12-23 12:32:14 · answer #7 · answered by Squiggy 7 · 0⤊ 0⤋
yes
2017-01-03 16:32:48 · answer #8 · answered by americo menendez 1 · 0⤊ 0⤋