DRAKE VM2050 Руководство по эксплуатации - Страница 5

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RF
Frequency Range:
T Channels T7 - T14,
(5.75 - 53.75 MHz).
Output Level:
+60 dBmV,
(adjustable +50 to +60 dBmV).
Output Impedance:
75 Ohms.
A/V Ratio:
Audio carrier -20 to -10 dB
referenced to video carrier,
adjustable.
Frequency Stability:
± 10 PPM.
Intercarrier Frequency:
4.5 MHz ± 10 PPM.
Spurious Outputs:
-60 dBc typical;
-58 dBc minimum, measured at
-15 dB A/V ratio and with
modulator output level of
+60 dBmV.
In-Channel C/N:
65 dB typical.
Broadband Noise:
-75 dBc typical, referenced to
video carrier. (4 MHz BW @
±12 MHz offset).
VIDEO
Input Level for 87.5%:
1 Vp-p ±3 dB manual gain
adjustment and front panel
modulation indicators.
Input Impedance:
75 Ohms, return loss of 26 dB
minimum.
Frequency Response:
20 Hz to 4.2 MHz, ± 1.0 dB
Video S/N:
60 dB minimum, luminance
weighted.
L/C Delay:
Within 50 nSec of 0 nSec L/C
delay (complies with FCC rules,
76.605).
Differential Gain:
Less than ± 3% (10 to 90% APL).
Differential Phase:
Less than ± 3
0
(10 to 90% APL).

Specifications

AUDIO
Input Level for 25 kHz Peak
Deviation:
-10 to +10 dBu manual gain
adjustment and front panel
modulation indicators.
Input Impedance:
10K Ohms, unbalanced.
Pre-emphasis:
75 Sec.
Frequency Response:
50 Hz to 15 kHz, ±1dB
Total Harmonic Distortion:
0.5% maximum.
Hum and Noise:
-60 dB minimum, referenced
to 25 kHz peak deviation.
COMPOSITE IF
LOOP
Output Level (V carrier):
+28 dBmV ± 2 dB.
Spurious Outputs:
-60 dBc minimum.
Input Level (V carrier):
+28 dBmV Nominal.
+30 dBmV Maximum.
IF Input Impedance:
75 Ohms, return loss greater
than 20 dB.
IF Output Impedance:
75 Ohms, return loss greater
than 15 dB.
Isolation:
Greater than 60 dB.
GENERAL
AC Power Input:
115 VAC, ±10%, 60 Hz,
25 Watts.
Operating Temperature
Range:
0
0
Size:
19" (481 mm) W x
1.75" (44 mm) H x
8.75" (222 mm) D.
Weight:
6.8 lbs. (3.1 Kg).
Connectors:
Video input, IF loop and RF
output are all type F.
Audio input is RCA phono.
5
to +50
0
C, ambient.