Specifications:
Description
GMTM-45 is a low cost, commercial grade high-performance mini-modulator. The GMTM-45 provides 45dBmV minimum output on any single VHF/UHF or CATV channel up to 135CH (54 to 860MHz). GMTM-45 use high quality SAW filter with FCC group delay pre-distortion to achieve optimum VSB selectivity and harmonics suppression, which allows for adjacent channel systems. Its universal design enables it to be installed in other manufactures’ mini-mod chassis. The superior performance of GMTM-45 is a best choice for different head-end system.
Features
+45 dBmV RF Output
Visual carrier is PLL synthesized
Chrominance / luminance delay is corrected to FCC standard
SAW Vestigial Sideband Filter Assure Ultimate Performance
Video Modulation, Audio deviation, and A/V ratio can be adjust on front panel
Complies with Safety Regulation / FCC 21006 for Aeronautical Offsets
Optional Compatible with BTSC Encoded Stereo Audio
die-cast chassis offers superior protection against ingress or egress
2U Rack system
Specification
RF OUTPUT SECTION |
|
Frequency Range |
54 MHz to 860 MHz appointed (CATV 2-135) |
|
Output Impedance |
75Ω |
|
Output Level Control Range |
-20 dB Continuously Adjustable |
|
Spurious Output |
< -60 dB |
|
Frequency Stability |
±10 KHz, (±5 KHz in aeronautical band). |
VIDEO SECTION |
|
Input Type |
Negative Sync. Composite Baseband Video |
|
Input Level |
0.5 Vp-p to 1.5 Vp-p for 87.5% modulation |
|
Input Impedance |
75Ω, unbalance |
|
Frequency Response |
±1.5 dB (30Hz to 4.2MHz) |
|
Signal to Noise Ratio |
≧60 dB (CCIR weighted) |
|
VISUAL C/N |
>64dB @ 4 MHz BW |
AUDIO SECTION |
|
Input Level |
0.5Vp-p for 25 kHz peak deviation |
|
Input Impedance |
600Ωunbalanced |
|
Pre-emphasis |
75μS ( 50μS for PAL ) |
|
Frequency Response |
0.75 dB |
|
Total Harmonic Distortion |
≦1.0% |
GENERAL SECTION |
|
Input Power |
2.9 Watt (+12 VDC/0.24A) |
All specifications are subject to change without notice
