Description
Stereo Multiplex Transmitter
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Part Number: FMT615C
Title: Stereo Multiplex Transmitter
Category: Multiplex-Stereo
Industry: TV/Radio Broadcast, CATV Cable Industry
Description:
| The FMT615C is equipped to accept audio and modulate the program to the 88-108 MHz F,M. stereo broadcast band. The audio may be true stereo (separate Left and Right channels) or mono, or synthesized (within the FMT615C) to stereo, as selected by a field-programmable jumper jack within the unit. In addition to the F.M. band output, there is a composite stereo audio output to feed an additional microwave modulator to deliver the stereo program to a remote cable system. There is also a mono output to feed audio to the T.V. audio modulator.
The RF output frequency of these units, like other F M Systems products, is adjustable in the field without changing crystals. This state-of-the-art design uses a master crystal oscillator and a programmable phase-lock-loop (PLL) system to precisely set the output to any standard frequency in the FM Broad- cast Band. Other frequencies outside the 88-108 MHz Band are available upon special request. If this product page shows “out of stock” the product is in production and can be purchased with a lead time of 1-2 weeks or less depending on quantity. To place an order for this product call 1-800-235-6960 and ask for the sales department. Or E-Mail your order to fmsystemsinc@sbcglobal.net. Most orders ship within a few days. |
| OVERALL PERFORMANCE | SPECIFICATION |
| Deviation (100%) | +75 KHz peak; 10% (+7.5 KHz) 19 KHz pilot |
| Frequency Response | 20-15,000 Hz +0.5 dB |
| Pre-emphasis | 75 microseconds |
| Total Harmonic Distortion | <0.5% |
| Stereo Separation | > 40 dB at 1000 Hz; > 30 dB at 15KHz |
| Signal-to-Noise | > 70 dB |
| AUDIO INPUT | SPECIFICATION |
| Format | True stereo or internally synthesized stereo from mono (field selectable) |
| Level (100% Modulation) | -10 dBm to +18 dBm, adjustable |
| Impedance | Balanced, bridging (50,000 ohms) |
| Indicator | “VU” meter |
| Connectors | Screw terminals |
| STEREO GENERATOR | SPECIFICATION |
| Format | Standard stereo multiplex with 19 KHz pilot |
| Synthesizer Type | Differential phase rotation |
| R.F. OUTPUT | SPECIFICATION |
| Frequency (FM or A-1 8 A-2 band) | 88.1 to 107.9 MHz or 108.1 to 119.9 MHz agile in 0.1 MHz steps |
| Other Frequency Bands | Available upon special request |
| Stability | 20 PPM; +1 KHz typical |
| Level | +20 to +50 dBmV, adjustable |
| Impedance | Directional coupler loop-thru (bridging) on 75 ohm line, “F” In and Out connectors. |
| Harmonic Output and 3rd Order Intermodulation | > 60 dB below +50 dBmV |
| AUDIO OUTPUTS | SPECIFICATION |
| Composite Stereo | 3.5 V P-P into 600 ohms, “F” connector |
| Mono | +10 dBm into 600 ohms, 75 microsecond de-emphasis, “RCA PHONO” connector |
| REMOTE CONTROL OPTION | SPECIFICATION |
| True Stereo Input | Screw terminal pulled to +5V by 10K ohms (+4 to +6V useable) |
| Stereo Synthesizer On | Control terminal grounded externally (-1 to +1V useable) |
| POWER REQUIREMENT | -24V (-21 to -33V), 110 mA |
| SIZE AND MOUNTING | Requires 1/3 F M Systems PMS600 main- frame/power supply, which fits standard 19″ wide rack, 1-3/4″ high, 10-1/4″ deep (remaining 2/3 PMS600 accommodates additional F M Systems 600 series modules) |
