Searching for information about the Tornado TV TAB display unit I found the youtube video channel of Michel Waleczek from France. He makes great video's of avionics tear downs and spectacular reverse engineering! So I saw also the video of the vintage Radio Altimeter WL63AMR/FA/2 manufactured by Smiths Industries. This in avionics instrument with a characteristic green dial. I got very interested and bought one also. ;-)
The instrument is a servo loop controlled radio altitude indicator. There's a warning light which is activated if the manual set altitude is passed. There's also a indicator flag built in to act as a warning that the instrument isn't powered and therefore the readings are incorrect.
There are two models known to me, the WL63AMR/FA/2 and the WL63AMR/FA/3. The instruments look identical, but the connector differs as shown below. The left one is the WL63AMR/FA/2 model and the right one is the WL63AMR/FA/3 model.
WL63AMR/FA/2 There's one heavy duty circular connector at the rear. Luckily Michel found out the connection for use for the WL63AMR/FA/2! The connections are mentioned below.
powersupply: A: 26 VAC 400 Hz power supply input
dial lighting: C+D: 5 Vrms for dial lighting
error flag indicator: E+J: +28 V for the arror flag actuator (signal on = flag removed)
measurement: G: 0...10V input voltage for 0...5000 feet indication H: measurement reference voltage (Vref = 12V for 0...10V indication) F: common terminal for input [G] and reference voltage [H] WL63AMR/FA/3 Info yet unknown...
Source: Connection information of the WL63AMR/FA/2 connector by Michel Waleczek
algemeen
Avionics safety!
Smiths Radio Altimeter
Ferranti FTS 21T turn and slip indicator
A: 26 VAC 400 Hz power supply input
