The Rohde & Schwarz SFM TV Test Transmitter is a flexible modularconcept based on plug-ins (freely selectable). The is SFM suitable for awide range of applications.By virtue of the highly compact design, agreat number of different configurations can be implemented in a singleSFM.Depending on application and configuration, the SFM may be used as:
- Multistandard signal generator providing vision and soundmodulation signals for up to seven TV standards (B/G, D/K, L/L', I, M,N, K1) including sound as is required by the dual-carrier method orNICAM-728 as well as an RF upconverter used as a tunable test signalsource
- RF upconverter with a maximum of three separately settable converters for adjacent-channel and intermodulation measurements
- IF modulator comprising several vision/sound modulators tovarious standards equipped for use in multichannel and multistandardsystems
The most important features of the SFM are:
- Generation of TV RF/IF signals (vestigial sideband amplitude modulation) to specified standards
- All vision and sound modulation parameters variable in wide ranges about standard values
- Vestigial sideband filter (SAW) and group-delay precorrection can be separately switched on/off
- Double-sideband test modulator for all IFs between 32 MHz and 46 MHz
- RF upconverter from 5 MHz to 1000 MHz; suitable for back-channel operation in analog and digital modulation modes
- Switchover between upper and lower sideband at RF
- Maximum RF output level from +10 dBm to 0 dBm depending onoperating mode (optimum signal-to-noise and signal-to-intermodulationratio)
- Non-interrupting level reduction down to -14 dB
- RF frequency resolution 1 kHz or 1 Hz for precision offset
- Frequency locking for all oscillators via internal 10 MHz reference frequency or external precision reference frequency
- RF output impedance 50 Ohm (female N) or optional 75 Ohm (female BNC)
- AF generator, 30 Hz to 15 kHz, and stereo/dual-sound coder (IRT/Korea)
- Wideband audio input for BTSC signals up to 120 kHz (standard M)
- NICAM QPSK modulator with generator for frequencies from 0 Hz to 15 kHz, adjustable BER, PRBS and I/Q test sequences
- NICAM intercarrier output adjustable between 5 MHz and 9 MHz, digital data/clock inputs/outputs for 728 kbit/s
- Instrument settings storable in internal memory or on memory card (PCMCIA)
- System-compatible due to IEC/IEEE-bus and RS-232-C interface
- Connectors for external keyboard and external monitor
