TFT 844 - Page 5

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MODULATION METERS, RIGHT
Right channel modulation
MODULATION METER, LEFT/TEST
Left channel modulation .
Right channel modulation
Main channel ..•.
L + R • • • • •
L - R • • • •
Indicates and measures right channel
modulation
. Indicates
and measures left channel
Modulation
.
Same as right modulation meter
.
Same as total modulation meter
• + 0.35
dB, 50 Hz to 15 KHz
. + 0.35 dB, 23 KHz to 53 KHz
38 KHz 1 eve 1 • • • • • • •
Pilot level ..
••.• 'Reasure down to -60 dB
• Measure down to -60 dB
Phase calibration .
.
For optimization of stereo
measurements
AM noise ..•.
Multipath indicator
. . Measures AM noise
PEAK MODULATION INDICATORS
Deviation for 100% indication .
Peak level ........ .
Accuracy
(5-KHz tone) .
Frequency response
Response time accuracy
Remote flasher output
Peak counter
.
For adjustment of antenna to minimize
multipath
distortion
. + 75 KHz
. -S-et by a front panel 3-digit thumb-
wheel switch in 1% steps from 0% to
199% on both positive and negative
peaks
. +
2% at 100% modulation
. + 2% from 30 Hz to 120 KHz
. Adjustable, 10 cycles of 10 KHz or
faster
. Suitable for driving two remote meter
panels
Registers
number of peaks per minute
MODULATION CALIBRATOR
Built in frequency synthesized calibrator for meter and peak flasher
calibration of 100% modulation from the front panel . Accuracy ,::1% .
MEASUREMENT OF RESIDUAL AM
Range . . . . • . . • . .
Accuracy
(at -30dB) ...
OUTPUTS, FRONT AND REAR PANEL
Main channel output with
75 sec de-emphasis
*Signal
to noise ratio .. .
*Harmonic distortion .. . .
*Intermodulation
distortion
*Frequency response . . . . .
. 0 to 70 dB
• + 1 dB
5 volts rms into SK ohms at 400 Hz
. 78 dB at 400 Hz with de-emphasis
.
0.1% max (de-emphasized)
• 0.
1% max per SMPTE standard
+0.25
dB from 30 Hz to 120 KHz
composite
-4-