Technalogix TAV-1000, Руководство пользователя

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III-8
Specifications
The following specifications were taken with a Technalogix modulator/processor. Should a different modulator or
processor be used, specifications could vary. For this reason, we recommend that any different
modulator/processor be shipped to Technalogix so the system can be matched and set up optimally. In
addition, the audio/video ratio the input to the power amplifier needs to be –10 dB in order for the software and
LCD readout to be accurate. All specifications below were taken with the audio/video ratio set -10dB.
RF Characteristics
Frequency range any specified VHF Channel 2 to 13
Frequency Response (one channel) ±0.5 dB
Frequency Stability ±250 Hz
Selectivity 60 dB (adjacent channel)
Minimum Input Level 0 dBmV
Rated Visual Output Power 1000 Watts
Rated Aural Output Power 10% of peak visual power
IF Output Level -12 dBm nominal
Input Impedance 75 Ohms
Output Impedance 50 Ohms
Harmonics > 60 dB below rated power
Predominant Intermodulation Distortion dBc = decibels below visual carrier
+ 920 kHz > -53 dBc
- 920 kHz > -53 dBc
+ 2.66 MHz > -53 dBc
- 2.66 MHz > -53 dBc
+ 5.42 MHz > -53 dBc
+ 7.16 MHz > -53 dBc
3
rd
Order Intermodulation Distortion
- 4.5 MHz > -60 dBc
+ 9.0 MHz > -60 dBc
All others > -60 dBc
Spurious Emissions > -60 dBc
NTSC Video Characteristics
Input Level to modulator (for 87.5% modulation)
1.0 V
PP
( 40IRE sync)
Differential Phase (at 87.5% modulation) ±2 Degrees
Differential Gain (at 87.5% modulation) 2%
Group Delay < ±40 nS
Video Group Delay Pre-emphasis Conforms to IC/FCC specifications
K-Factor 1.9% for 2T Pulse
Hum and Noise > 60 dB below rated power
Aural Characteristics