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| 300VMF+
COMMERCIAL VIDEO MODULATOR |
The DRACOM 300VMF+ fixed channel video modulator is a quality vestigial sideband heterodyne audio/video modulator that provides a modulated visual and aural RF carrier output on any single channel up to 552 MHz. The 300VMF+ is designed to accept video and audio baseband signals from a satellite receiver, TV camera, or any compatible source.
- Heterodyne conversion system, in conjunction with the use of a SAW filter, insures optimum vestigial selectivity for adjacent channel headends.
- Accepts standard (sync. Negative) polarity video at 0.7 to 1.5 Vp-p level.
- All level controls are conveniently located on the front panel.
- High output power to +55 dBmV.
- A convenient monitor port is provided.
- Pre-emphasis may be disabled for special applications like an external stereo generator.
- All aeronautical channels are offset positive with a tolerance of ± 5 kHz as required by FCC rules.
- Rear Panel AC line convenience outlet.
Dracom 300VMF+ Technical Specifications
RF
Frequency
Range:
54 through
552 MHz.
Channels
Available:
CATV Channels
2 through 78 and 95 through 99
FCC
Frequency Offsets:
All aeronautical
channels offset positive with a tolerance of ±5 kHz.
Output
Level:
+55 dBmV
minimum, (typically adjustable from +43 to +55 dBmV).
Output
Impedance:
75 Ohms;
return loss of 14 dB nominal.
A/V
Ratio:
Audio Carrier
-20 to -12 dB referenced to video carrier, adjustable.
Frequency
Stability, Visual:
Within ± 10 kHz of assigned channel
frequency. Within ±5 kHz of assigned channel frequency on FCC offset channels.
Aural
Intercarrier Frequency:
4.5 MHz,
± 5 kHz.
Spurious
Outputs:
-60 dBc
minimum, measured at -15 dB A/V ratio and with modulator output
level of + 55 dBmV.
In-Channel
C/N:
Better than
60 dB.
Broadband
Noise:
-95 dBc
@ ± 30 MHz or greater spacings.
(Specified levels are referenced to the video carrier and measured
in a 4 MHz bandwidth.)
Video
Input
level for 87.5% modulation:
1 Vp-p ± 3 dB, manual gain adjust
with front panel control.
Input
Impedance:
75 Ohms,
return loss of 18 dB minimum.
Frequency
Response:
Flat ± 2 dB from 30 Hz to 4.2 MHz.
Video
S/N:
60 dB minimum,
luminance weighted.
L/C
Delay:
Within 50
nanoseconds of 0 nanoseconds L/C delay (complies with FCC rule
76.605).
Differential
Gain:
Less than
± 5% (10 to 90% APL).
Differential
Phase:
Less than
± 5 degrees (10 to 90% APL).
Audio
Input
Level for 25 kHz Peak Deviation:
175 mV rms
minimum. Manual gain adjustment with front panel control.
Input
Impedance:
10K Ohms,
unbalanced.
Pre-emphasis:
75 m Sec. (may be disabled with
internal jumper change)
Frequency
Response:
40 Hz to
15 kHz, ±1.5 dB, referenced to 75 m Sec. pre-emphasis curve.
4.5
MHz Intercarrier Stability:
± 5 kHz, 0 degrees Celsius to + 50 degrees Celsius.
Total
Harmonic Distortion:
1.5% maximum.
Hum
and Noise:
-60 dB minimum,
referenced to 25 kHz peak deviation.
General
AC
Power Input:
115 VAC
± 10%, 60 Hz, 10 Watts.
Operating
Temperature Range:
0° to 50°
Celsius, ambient.
Dimensions:
1.75 inches
Height x 19 inches Width x 4.0 inches Depth.
Weight:
3.6 lbs.
Connectors:
Video input,
Audio Input, monitor and RF output are all type F.
Dracom 300VMF+ Technical Specifications
| RF | |
| Frequency Range: |
54 through 552 MHz. |
| Channels Available: |
CATV Channels 2 through 78 and 95 through 99 |
| FCC Frequency Offsets: |
All aeronautical channels offset positive with a tolerance of ±5 kHz. |
| Output Level: |
+55 dBmV minimum, (typically adjustable from +43 to +55 dBmV). |
| Output Impedance: |
75 Ohms; return loss of 14 dB nominal. |
| A/V Ratio: |
Audio Carrier -20 to -12 dB referenced to video carrier, adjustable. |
| Frequency Stability, Visual: |
Within ± 10 kHz of assigned channel frequency. Within ±5 kHz of assigned channel frequency on FCC offset channels. |
| Aural Intercarrier Frequency: |
4.5 MHz, ± 5 kHz. |
| Spurious Outputs: |
-60 dBc minimum, measured at -15 dB A/V ratio and with modulator output level of + 55 dBmV. |
| In-Channel C/N: |
Better than 60 dB. |
| Broadband Noise: |
-95 dBc @ ± 30 MHz or greater spacings. (Specified levels are referenced to the video carrier and measured in a 4 MHz bandwidth.) |
| Video | |
| Input level for 87.5% modulation: |
1 Vp-p ± 3 dB, manual gain adjust with front panel control. |
| Input Impedance: |
75 Ohms, return loss of 18 dB minimum. |
| Frequency Response: |
Flat ± 2 dB from 30 Hz to 4.2 MHz. |
| Video S/N: |
60 dB minimum, luminance weighted. |
| L/C Delay: |
Within 50 nanoseconds of 0 nanoseconds L/C delay (complies with FCC rule 76.605). |
| Differential Gain: |
Less than ± 5% (10 to 90% APL). |
| Differential Phase: |
Less than ± 5 degrees (10 to 90% APL). |
| Audio | |
| Input Level for 25 kHz Peak Deviation: |
175 mV rms minimum. Manual gain adjustment with front panel control. |
| Input Impedance: |
10K Ohms, unbalanced. |
| Pre-emphasis: |
75 m Sec. (may be disabled with internal jumper change) |
| Frequency Response: |
40 Hz to 15 kHz, ±1.5 dB, referenced to 75 m Sec. pre-emphasis curve. |
| 4.5 MHz Intercarrier Stability: |
± 5 kHz, 0 degrees Celsius to + 50 degrees Celsius. |
| Total Harmonic Distortion: |
1.5% maximum. |
| Hum and Noise: |
-60 dB minimum, referenced to 25 kHz peak deviation. |
| General | |
| AC Power Input: |
115 VAC ± 10%, 60 Hz, 10 Watts. |
| Operating Temperature Range: |
0° to 50° Celsius, ambient. |
| Dimensions: |
1.75 inches Height x 19 inches Width x 4.0 inches Depth. |
| Weight: |
3.6 lbs. |
| Connectors: |
Video input, Audio Input, monitor and RF output are all type F. |
|
|
INNER S.R.L. Todos los derechos
reservados 2005 |