TV measurement
38
Sound Carrier Distance and Sound Carrier Level
On a second sound carrier, TV broadcast stations can transmit either
frequency-modulated (analogue) or in Nicam format (digital). Depending
on the standard which has been set, various frequencies are assigned to
the sound carriers, see table. Sound carrier 1 is permanently set after the
channel entry or frequency entry.
Standard TT1 TT2 Nicam
B/G 5.5 MHz 5.74 MHz 5.85 MHz
D/K 6.5 MHz 6.26 MHz 5.85 MHz
I 6.0 MHz ------ 6.552 MHz
M/N 4.5 MHz 4.72 MHz ------
L AM 6.5 MHz ------ 5.85 MHz
M1 (Japan) 4.5 MHz ------ ------
The sound carrier measurement is carried out by measuring the signal
distance from the sound carrier to the picture carrier in dB before
measuring the absolute sound carrier in dBµV. The loudspeaker remains
muted during this procedure. When the measurement has been effected,
the modulation of the sound carrier last measured can be heard.
TV Sound Carrier Measurement Menu
[2ndF] [SC] Changing over to sound carrier menu:
[1] bis [2] Change-over between TT1 and TT2, see table
Measurement is carried out when key is pressed
[3] Change-over to Nicam reception
Example
Measuring sound carrier distance and sound carrier level of TT1:
Press [2ndF] [SC],
now press [1] and keep the key pressed.
The LC display will indicate the following values for appr. 1 second:
• Sound carrier distance – frequency: 5.5 MHz
• Sound carrier – picture carrier distance: -13 dB
• Mode: TV analogue
After about 1 second, the sound carrier level will be indicated.
LC display:
• Sound carrier distance – frequency: 5.5 MHz
• Sound carrier level: 58.5 dBµV
• Mode: TV analogue
Release key [1].
Measuring sound carrier distance and sound carrier level of TT2:
Press [2] while the sound carrier is displayed
Measuring the distances and the levels of Nicam sound carriers:
✐
À
SC: 5,50MHz TV
LEV: -13.0dB A
SC: 5,50MHz TV
LEV: 58,5dBuV A
