3.Mute indicator: When this red status light is on, the system is muted, indicating low or no RF signal from the transmitter. The squelch action operates with a pilot tone from the transmitter and requires no manual adjustment at the receiver. It is the level of this signal that automatically mutes the system, preventing a rise in noise when the RF signal is low or
4.RF level: This consists of a set of 5 LED status lights. When RF signal strength is high, all five are lit, and proper operation is underway. When only the lowest light (yellow) is lit, there is minimal RF input to the system. This is an indication to the operating engineer to take measures, such as changing channel assignments or rearranging the antenna array, so that the RF level can be increased.
5.Diversity status, A and B: These LEDs indicate on an instantaneous basis which of the two internal diversity channels is in operation. In normal use there should be nearly random switching back and forth between the two. If one of the status lights remains on much of the time it is an indication that the operating engineer should slightly rearrange the antennas or shift to another frequency. Constant switching of the LEDs indicate the receiver is searching for the signal, and this the normal mode of operation.
6.AF level: The audio frequency level indicator shows the actual output of the receiver. Normal peak outputs should be in the range of
7.Channel selector: The channel selector is set with the small screwdriver and must match the channel set on the transmitter. (Unlike the transmitter, you do not need to turn the receiver off when selecting a new frequency.)
Here are descriptions of the back panel controls:
1.Antenna A and B connections. These are the BNC
2.Signal outputs: You have your choice of three operating modes:
A.Line level unbalanced out at
B.Line level balanced. Use
C.Microphone level balanced. Use
3.Power in: Power for the SR 61 and 81 systems is normally by way of a wall 12 to 16 volt ac or dc power unit plugged into the power receptacle on the back of the unit. Excess wire length may be looped around one of the small brackets for strain relief. Power may also be supplied from the PS 61 or 81 through the antenna coaxial cable.
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