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| PRODUCTOS |
| MMDS |
| MARCAS LIDERES |
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| VMM860AS
AGILE STEREO VIDEO MODULATOR |
The VMM860AS is an agile, stereo, vestigial
sideband, heterodyne audio/video modulator with synthesized visual and
aural carriers. One to twelve modulators or other accessories can be mounted
in the same amount of rack space typically required for two standard size
units. Ideally suited for private cable, hotels and motels, institutional,
and SMATV applications, the VMM860AS accepts video and audio baseband
signals from a satellite receiver, TV camera, videotape recorder, TV demodulator,
or similar signal sources.
. Convenient Pushwheel Switches for Channel Selection.
. BTSC Stereo Audio
. LED overmodulation indicators assist in setting proper modulation.
. CATV channels 2 - 135 or Broadcast channels 2 - 69 selectable from front
panel.
. Agility allows for "hot standby" solutions in headends.
. Agility allows for minimal service stock.
. A versatile, professional BTSC vestigial sideband modulator.
. +45 dBmV output. Adjustable from +35 to +45 dBmV.
. SAW filtering for superior adjacent channel performance.
. Front panel control of RF output level, A/V ratio, and video/audio modulation.
. Complies with FCC Rules Part 76.
. Use up to 12 VMM860AS modulators in a two rack height space powered
by a single PSM121 Power Supply or up to 4 VMM860AS modulators in the
one rack height RMM4 rack with power supply.
. Rack mount and PSM121 Power Supply sold separately.
VMM860AS Technical Specifications
| RF | |
| Frequency Range: |
Agile, 54 through 864 MHz. |
| Frequency Selection: |
Standard CATV
Channels 2 through 135 (standard, HRC, or IRC) Broadcast TV Channels 2 through 69 |
| Output Level: |
+45dBmV minimum, typically adjustable from +35 to +45 dBmV |
| Output Impedance: |
75 Ohms, return loss of 8 dB |
| A/V Ratio: |
Audio Carrier -22 to -12 dB, referenced to video carrier, adjustable |
| Frequency Stability: |
± 5 kHz. |
| Intercarrier Frequency: |
4.5 MHz ± 50 Hz. |
| FCC Frequency Offsets: |
Automatic (+12.5 KHz, +25 KHz, or none as required for each channel) |
| Spurious Outputs (5-900 MHz): |
-60 dBc, measured at -15 dB A/V ratio and with modulator output level of +45 dBmV |
| In Channel C/N: |
65 dB typical, 4MHz bandwidth |
| Broadband Noise: |
-78 dBc typical, 4 MHz bandwidth @ 45 dBmV output |
| Video | |
| Input Level for 87.5% modulation: |
0.65 Vp-p to 1.5 Vp-p, manual gain adjustable with front panel control |
| Overmodulation Indicator: |
Trips at 87.5% modulation depth. |
| Input Impedance: |
75 Ohms, return loss of 26 dB minimum |
| Frequency Response: |
20 Hz to 4.2 MHz, ± 1 dB |
| C/L Delay: |
within 50 nSec. of F.C.C. predistortion. |
| Differential Gain: |
± 3% (10 to 90% APL) |
| Differential Phase: |
± 3 degrees (10 to 90% APL) |
| Audio | |
| Input
Level for 25 kHz Peak |
250 mVrms to 2.5 Vrms. Manual gain adjustment with front panel control |
| Overmodulation Indicator: |
Trips at ± 25 kHz L+R deviation. |
| Input Impedance: |
>10K Ohms, unbalanced |
| Pre-emphasis: |
75 m Seconds |
| Frequency Response: |
50 Hz to 14 kHz, ± 1 dB referenced to 75 m second pre-emphasis curve. |
| Signal to Noise Ratio: |
>60 dB |
| Total Harmonic Distortion: |
< 0.5% |
| General | |
| DC Power Input: |
+12 VDC @ 220 mA, +5 VDC @ 400 mA (typical) |
| Operating Temperature: |
0° to 50° Celsius (32° to 122° Fahrenheit), ambient. |
| Dimensions: |
3.5 inches (89 mm) Height x 1 inch (25 mm) Width x 8 inches (203 mm) Depth |
| Weight: |
13.5 ounces (0.383 kg.) |
|
| INNER
S.R.L. Todos los derechos reservados 2005 |