9200/9205/9205N Series Monaural STL

GENERAL DESCRIPTION

The Model 9200 Series Monaural STL System is an economical, frequency-synthesized STL system which is designed for either single, redundant dual channel or stereo program transmission for studio to transmitter links or inter-city relays.  Both the transmitter and receiver utilize state-of-the-art Very Large Scale Integrated (VLSI) circuits to achieve low component count for high reliability and reduced manufacturing costs.

The optional built-in 39 kHz FM subcarrier generator and demodulator may be utilized for either data transmission or a supervisory channel.

When two STL transmitters and receivers are used for stereo, provision is made for properly matching phase and gin characteristics between the two pairs.

Both the transmitter and receiver feature comprehensive front panel metering for monitoring system performance including forward and reverse power and other important diagnostic functions.

FREQUENCY SYNTHESIZED

The TFT patented frequency synthesized design provides very low phase noise and low spurious output so that the STL system can achieve greater than 70 dB SNR with only +/- 22 kHz of FM deviation, which makes efficient use of the RF spectrum.  The "on channel" amplification technique instead of crystal modulation / multiplication eliminates the errors inherent in a crystal frequency multiplication STL system.  The 9200/9205 is an ideal narrow band STL system which is optimized for operation in congested RF environments.  It has excellent protection against adjacent channel interference and delivers broadcast quality sound without degradation. 

STEREO OPERATION

For stereo or dual mono installations in which the transmitter and receiver pairs share common antennas, TFT can furnish a transmitter combiner/isolator which eliminates intermodulation products and a receiver low noise antenna splitter.

SPECTRUM EFFICIENT CHANNEL SPACING

The 9200/9205 is available in two different RF channel spacing configurations.  The standard is for a minimum 200 kHz channel spacing with a deviation of +/- 22 kHz for the program channel and +/- 3 kHz deviation for a 39 kHz subcarrier for data or remote control.  The 9200/9205N is a narrow band system which incorporates a phase-linear crystal filter for a minimum 100 kHz channel spacing with a deviation of +/- 15 kHz for a 15 kHz program channel only.

HOT-STANDBY OPERATION

Model 7770 Transmitter Automatic Changeover unit is an optional 1-3/4" high rack mount unit which monitors critical parameters of two transmitters.  If a fault is detected, it automatically switches the antenna to the hot standby transmitter.  Changeover can also be accomplished by a front panel switch or relay contact closure in remote equipment.

The 9205 receiver has a built-in failure sensing and changeover circuit.  When the primary receiver fails, it automatically switches the output to the hot-standby unit.  No optional receiver changeover is required.

OPTIONS

SCA/MUX Encoder (7100-4227) = Plug in SCA/MUX generator board for subcarrier frequency of 39 kHz.

SCA/MUX Decoder (7100-3752) = Plug in SCA/MUX decoder board for demodulation of the 39 kHz subcarrier channel.  Please specify audio or subcarrier output.