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Listen FM products offer several functions that can enhance the experience of the user. The LCD on many of the products have several setting changes that allow for customized user scenarios. This post will briefly touch on three features that will reiterate my points.

#1 Locking and unlocking on a channel

All of Listen’s FM products can be locked on a channel. Most of the products are locked through software (the LR-200 is locked on a channel with a manual channel switch). Locking on a channel is great in applications where a person does not want the unit to be tampered with. For example, if you are a house of worship broadcasting on only one frequency, you may not want your patrons to access any of the other channels on their receiver. This will help eliminate any confusion caused if the SEEK or UP/DOWN buttons are accidentally hit. Locking the channel is slightly different on each Listen receiver model. Here’s how to lock the channel.

  • For the LR-300, 400 or 500 Portable Receivers
      • With the unit ON, press and hold the SEEK button down for five seconds.

      • If you are using the LR-400 and LR-500, a lock symbol will be displayed on the LCD.

    • On all receivers, the red LED will indicate the lock status. If SEEK or UP/DOWN is pressed with the unit locked, the LED will blink. The LED will remain illuminated if the receiver is not locked.
    • To unlock the receiver, press and hold the SEEK for five seconds.
  • For the LT-700 Portable Transmitter
      • With the unit ON, press and hold the UP button.

      • A lock symbol will be displayed on the LCD.

    • The red LED will also indicate if the transmitter is locked. If the Up/Down buttons are pressed, the LED will blink indicating the unit is locked. The LED will remain illuminated if the transmitter is not locked. Pressing the PWR button will turn the unit off regardless of the lock status.
    • To unlock the LT-700, press and hold the UP for five seconds.
  • For the LT-800 Stationary Transmitter
    • With the unit ON, press the UP button.
    • A lock symbol will be displayed on the LCD.
    • The LT-800 does not have an LED to indicate that the unit is locked.
    • To unlock the LT-800, press and hold the UP for five seconds.

 

#2 Programming the LR-500 or LT-700 to lock out channels

Programming the LR-500/LT-700 is great way for the unit to allow only a couple of channels to receive/transmit. This is a great application for tour groups or language interpretation when a person has to quickly change between a set number of channels. For example, in an application where four different tours are taking place, the unit can have all but four channels locked out. The tour group leader can direct the group to change to any of the four channels that may be open. Instead of scrolling through all 57 channels, the unit will now only show four. To program the LR-500/LT-700, do the following:

    • With the unit ON, press the UP and DOWN buttons simultaneously for 5 seconds, until the PGM symbol appears in the display.

    • You will notice a “PGM” symbol at the bottom of the LCD.

    • Use the UP/DOWN buttons to select the channels.
    • When you have reached a channel that you do not want to display, press the SEEK button (PWR button, if you are programming the LT-700).
    • Notice on the LCD that an L/O is now indicating that the unit has that particular channel “locked out”.

  • After setting locking out all desired channels, let the unit set idle for 5 seconds. The unit will exit “programming” mode.

 

#3 Changing the squelch on the receiver (LR-400 and LR-500 only)

Squelch is the function of the receiver to suppress the audio being received when the signal from the transmitter has become too weak. Generally, this occurs when the receiver gets further from the transmitter. It can also occur if the transmitters signal is obstructed before it reaches the receiver. A low signal allows for noisy artifacts to be heard. You can adjust the squelch on your receiver so that these noises are not heard. Keep in mind; this will limit the range between the receiver and the transmitter. To adjust squelch, do the following:

    • With the unit off, hold the SEEK button down.

    • Now, turn the volume wheel “on”.
    • By default, the number “03” will be displayed on the LCD.

    • To adjust the squelch, press the Up/Down buttons to raise or lower the setting.

    • The larger the number, the more sensitive the receiver will be to a low signal causing it to squelch. The smaller numbers effectively allows the receiver to receive a lower signal before it squelches. If you get to “0”, the receiver will not squelch.

Some simple solutions that will help in those situations where programming is needed.

Three separate ListenTALK receivers in a row with different group names on each display screen.
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