Installation - Marti Electronics SR–20M Manual

INSTALLATION

IMPORTANT NOTICE
This equipment must be operated in a well–ventilated
Install rack–mounted equipment in a well–ventilated, well–grounded, and shielded rack
cabinet. Do not locate solid–state equipment in a rack above tube–type equipment, which
produces high temperatures.
Problems can also be avoided by locating this unit away from other equipment, which has
transformers that produce strong magnetic fields. These fields can induce hum and noise into the
Marti equipment thus reducing performance. Strong radio frequency (RF) fields should be avoided
where possible. Extensive shielding and filtering has been incorporated into this equipment to
permit operation in moderate RF environments. All equipment racks, cabinets, etc. should be
bonded together by wide copper grounding strap to ensure that all system elements are at RF
ground potential.
SR–20M CONNECTIONS
Refer to Figure 1 as required for the following connections.
1. Connect the receiving antenna coax to the ANTENNA TYPE N port on the rear–panel using a type–N male
connector. A short flexible jumper, 20 inches maximum, may be used between the ANTENNA port and the
Heliax. Marti Part No. 585–017 Double–Shielded, Low–Loss RG–214/U jumper is recommended.
2. Balanced program audio output is located at accessory circuit board connector J2–1 and J2–2 (refer to Figure 2).
The output level can be adjusted from –10 to +11 dBm. Connect shielded audio cable to J2–1 and J2–2. If
unbalanced audio is desired, connect a cable to BNC receptacle J2 on the rear panel.
3. Connect a Remote Control or Subcarrier Demodulator to the SUB1 OUT J1 or SUB2 OUT J3 BNC connectors
on the rear–panel. The subcarrier: 1) impedance may be 600 to 10 K ohms and 2) the output level is approxi-
mately 0.5 Volts peak–to–peak. Subcarrier frequencies may be between 26 KHz and 110 KHz.
4. For dual channel stereo operation, use only Marti MTS–1 coaxial transformer for splitting the received signal to
the two receivers.
IF DC OPERATION IS REQUIRED, DO NOT APPLY MORE THAN +14V
5. Ensure the receiver rear–panel ON/OFF switch is OFF. Connect the rear–panel AC line receptacle to an 85 to
264V, 47 to 63 Hz AC power source. USE ONLY A 3–PRONG GROUNDED OUTLET RECEPTACLE
FOR SAFETY. The unit can also be operated from a +10V to +14V external dc supply. If dc operation is
required, refer to Figure 2 and connect: 1) the positive wire to J2–13 and 2) ground to J2–14.
6. The receiver is equipped with a rear–panel ground terminal. Connect a ground wire between earth ground and
the GND terminal on the receiver rear panel.
rack cabinet.
CAUTION
TO THE UNIT.
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