4.1.Controls
4.1.1.Front Panel
1a POWER: Switches the power to the receiver ON and OFF.
1b VOLUME: The VOLUME pot matches the receiver’s output level to the input sensitivity of your mixer or amplifier.
1c TCSQ: The TSCSQ (Tone Code Squelch) automatic squelch circuit mutes the receiver if the received signal is too weak or the transmitter switched off, effectively suppressing the audible noise caused by an excessive drop in received signal strength. The squelch circuit is controlled by a pilot frequency in the transmitter signal and therefore needs no
1d CHANNEL: This rotary switch selects the desired carrier fre- quency or its alternative frequencies.
1e BATTERY HI, MID, LO: These three LEDs indicate the current status of the transmitter batteries:
HI, MID, and LO lighting constantly indicate the batteries will last for more than 6 hours (rechargeable batteries: 5 hours max.). MID and LO lighting constantly indicate the batteries will last for more than 3 hours.
LO (red) lighting constantly indicates the batteries will last for 1 hour.
LO (red) blinking indicates the batteries will be down in less than 1 hour.
When using rechargeable batteries, note that only MID and LO may light even if the batteries are fully charged. This means that depending on the capacity, quality, or age of the batteries their maximum life is approx. 4 hours.
1f MUTE LED: Lights red if the squelch is active. In this case the audio output will be muted. Note that the MUTE LED does not indicate the position of the MUTE switch on the trans- mitter!
1g RF LEDs: One yellow and four green LEDs indicate the re- ceived field strength of the transmitter signal. Only the yellow LED lighting indicates low field strength.
1h AF/PEAK LEDs: Indicate the received audio level.
The green LEDs lighting and the red LED flashing occasional- ly indicate optimum modulation.
If the LEDs do not light, the sensitivity setting on the transmitter is too low.
The red LED lighting constantly indicates overmodulation.
1i Diversity LEDs A and B: Indicate which of the two receiving antennas is active.
If you use remote antennas, only one LED lighting constantly indicates that the cable to the other antenna has broken.
1j Color Code: If you use the receiver within a multichannel system, you may remove the black plastic platelet and re- place it with a colored platelet included in the optional Color Coding Kit to identify each channel by a different color.
4.1.2. Rear Panel
1k Carrier Frequency Table: A label listing the available fre- quencies is affixed to the bottom panel of the receiver.
1l Frequency Set Designation: The label on the bottom panel also indicates the designation of the Frequency Set.
1m POWER: Input connector for the supplied AC adapter.
1n AUDIO OUT UNBALANCED: Unbalanced audio output on a 1/4” mono jack for connecting to, e.g., a guitar amplifier.
1o AUDIO OUT BALANCED: Balanced
1p BALANCED LINE/MIC: Switches the balanced audio output to line or microphone level. Therefore, you can connect the receiver to microphone or line level inputs as desired.
1q ANTENNA A, ANTENNA B: BNC sockets for connecting the two supplied receiving antennas. The SR 61 and SR 81 are diversity receivers and use two antennas in order to re- ceive the transmitter signal at two different spots. The diversity electronics will automatically activate the antenna that delivers the better signal.
Each ANTENNA socket provides a 4.2 V/35 mA supply voltage for the optional RA 61 B or RA 81 B remote booster antennas.
In a multichannel setup using the optional PS 61 or PS 81 Power Splitter and optional PSU 01 Central Power Supply, the ANTENNA sockets are also used as inputs for the supply voltage delivered by the PSU 01. In this configuration, be sure not to use the supplied external AC adapter. For details on setting up multichannel systems, refer to the PS 81 or PS 81 Manual.
1r Screwdriver for adjusting GAIN and CHANNEL controls.
4.2.Optional Accessories Color Coding Kit
5. Handheld Transmitter
The HT 61 handheld transmitter and matching microphone ele- ments (optional) provide the same acoustic performance as the equivalent hardwire microphone versions. The microphone ele- ments available for the HT 61 have been specifically designed for vocal use.
The HT 61 operates in a subband up to 4 MHz wide within the 138 MHz to 250 MHz VHF carrier frequency range. The HT 61 can be switched to a maximum of 15 different carrier frequencies depending on local frequency allocations.
The transmitter uses a dipole antenna integrated in the body. The controls can be protected against accidental misadjustment collectively (2d) or individually with the supplied adjustable pro- tective ring (2j).
The HT 81 is identical to the HT 61 except that it operates in the 710 MHz to 869 MHz UHF range
5.1. Controls
2a PWR: Switches the transmitter power ON (“I”) and OFF (“0”).
2b Status LED: Indicates battery status and audio input overload. LED glowing dimly: batteries are OK.
LED constantly lighting brightly: batteries will be dead in about 60 minutes.
LED illuminating brightly: audio input is overloaded.
2c MIC: Mutes the audio signal (position “0”) while power and carrier frequency remain ON.
2d Color Code: If you use the transmitter in a multichannel system you can remove the black plastic ring and replace it with a colored ring from the optional Color Coding kit to identify each wireless channel by a different color.
2e GAIN: This rotary pot allows you to match the microphone level to the transmitter’s audio section.
2f Battery Compartment: Refer to Section 9. Setting Up.
2g CHANNEL: This rotary switch selects the desired carrier fre- quency (depending on local allocations) or switches between
the carrier frequency and its alternative frequencies. Important: Prior to selecting frequencies, switch the transmitter
OFF.
2h Carrier Frequency Table: A label listing the available fre- quencies is affixed to the battery compartment.
