Rohde & Schwarz SFM TV Test Transmitter

Uses

The flexible modular concept based on plug-ins (freely selectable) makes the SFM suitable for a wide range of applications.By virtue of the highly compact design, a great number of different configurations can be implemented in a single SFM.

Depending on application and configuration, the SFM may be used as

• Multistandard signal generator providing vision and sound modulation 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 or NICAM-728 as well as an RF upconverter used as a tunable test signal source
• RF upconverter with a maximum of three separately settable converters for adjacent-channel and intermodulation measurements
• IF modulator comprising several vision/sound modulators to various standards equipped for use in multichannel and multistandard systems

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 on operating mode (optimum signal-to-noise and signal-to-intermodulation ratio)
• 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 Ω (female N) or optional 75 Ω (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