ADF操作测试程序中A1、A2台是什么概念？

tltl21 · 发表于 2010-6-22 00:06:35

Subtask 34-53-00-710-056
A. Operational Test of the ADF

ACTION RESULT
1. On the center pedestal, on one ACP:
-  push the ADF1 (ADF2) pushbutton switch.

2. On the RMP1 (RMP2):
-  set the ON/OFF selector switch to ON

-  set an ADF local frequency .
(Ref. Fig. 501/TASK 34-53-00-991-002 SHEET 501.1)
On the CAPT and F/O NDs:
-  the ADF1 (ADF2) pointer moves and shows the station direction.

-  the station identification or frequency comes into view in the left lower corner.

  In the loudspeakers:
-  if the station set is a A1 station, you cannot hear the identification signal. Do step 3

-  if the station set is a A2 station, you can hear the identification signal. Go to step 4

3. On the RMP1 (RMP2):
-  set the BF0 function.
(Ref. Fig. 501/TASK 34-53-00-991-002 SHEET 501.1)
In the loudspeakers, you can hear the identification signal but it is weaker.
4. On the RMP1 (RMP2):
-  set a non local ADF station.
(Ref. Fig. 501/TASK 34-53-00-991-002 SHEET 501.1)
On the CAPT and F/O NDs, the ADF1 (ADF2) pointer goes out of view.
  In the loudspeakers, no signal is heard.
A1、A2是什么台？谢谢指点

a320av · 发表于 2010-6-22 04:20:53

A1 = unmodulated CW with ident transmitted by ON/OFF keying of the CW itself in the pattern of morse code to produce the ident.

A2 = CW with ident carried by a superimposed modulation (usually AM).

carrier wave (CW).