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The SR series of receivers from Cobham Surveillance (GMS Products) are advanced technology microwave receivers capable of operation at 350-440 MHz, 1.7-1.85, 2.0-2.7, 4.4-5.0, 6, 7, or 8 GHz bands (for details on X-band receiver, see description below). The SR Series demodulates one video and two audio signals from a composite analog RF source. The receiver is controlled by a microprocessor with an easy to use menu system. C
hannel of operation, video, and audio output levels can be selected via the front panel membrane switch. Operational parameters are displayed on the easy to read liquid crystal display including channel, signal strength, output level, and lock status. Both digital and analog representations of signal strength are incorporated to facilitate path alignment. The SR Series receiver can also be controlled with the Cobham Surveillance (GMS Products) hand-held controller via a simple RS-232 interface.
The SR Series features an integral Low Noise Amplifier at the RF input with a nominal noise figure of 4 dB. The dual conversion receiver employs a SAW filter at each IF stage for enhanced adjacent channel interference rejection. In addition, the receiver is equipped with an internal low pass filter eliminating the need for an external video filter.
The SR Series receiver can be factory configured for either NTSC or PAL formats. Two buffered video output signals are provided at BNC connectors in the SR Series receiver, with balanced audio and composite video available on the rugged 10 pin connector. Low power consumption makes the SR Series ideal for use in remote applications.
Model No. | SR
|
RF Frequency Range | 1.7-8.0 GHz standard
(consult factory for additional frequencies) |
Frequency Stability
| 0.005%
|
Noise Figure
| 5 dB typical L/S; 7 dB typical C
|
Dynamic Range
| 75 dB |
Sensitivity
| -83 dBm, S/N weighted of 43 dB
for L/S & 40 dB for C typical |
Input Impedance
| 50 Ohm
|
Power Voltage | 11-15 V DC |
| Current | 800 mA typical |
Video
Output Impedance | 75 Ohms |
Output Level 1
| 1 V (peak-to-peak) |
| De-emphasis | Per CCIR 525/625 line |
Frequency Response
| 10 Hz-5.5 MHz
10 Hz-10 MHz composite |
Signal to Noise
| 65 dB p-p/rms weighted typical
|
Signal to Low
| 55 dB frequency noise Meets or exceeds EIA/TIA 250-C end-to-end performance specifications |
Environment Temperature | -20ºC to +70ºC
|
| Humidity | 0 to 100%, Non-condensing |
Audio Sub-carriers available | 4.83, 5.8, 6.0, 6.2, 6.5, 6.8, 7.02, 7.5, 8.3, 8.5, 8.59 MHz
(any two or user-selectable) |
| Output Impedance | 600 Ohm balanced |
| Output Level | +9 dBm Meets or exceeds EIA/TIA 250-C end-to-end performance specifications |
Mechanical Size | 3.25"x4.25"x1.5" (8.3x10.8x3.8 cm) |
| Weight | 14 oz (397 g) |
Connectors RF Input Connector | SMA
|
Video Output Connector
| BNC Female (2) |
| Audio/Power Connector | PTO2H-12-10P |
Pinout
| A:+11-15 V DC B:Ground C/E:Audio 1 D/F: Audio 2 G/H:RS-232
J:Video K:Compo |