an error tone will sound as long as the PTT is held. When you release the PTT button, the Time Out Timer is reset.

Busy Channel Lockout (BCLO)

The radio may be programmed to inhibit transmit while a signal is being received. If so, an error tone will sound if PTT is pressed while the channel is busy. BCLO may also be programmed to allow transmit to occur if you are receiving a signal from someone in your system, allowing you to maintain control of a repeater during your conversation.

A/B/C Key Functions

The A, B and C keys can be programmed for any of several functions as described below. If programmed for no function, pressing the keys will only cause the error tone to sound. Check with your dealer or equipment provider to determine the programmed function of these keys.

Key Lock - prohibits activation of the Scan, Up/Down, L/O and DTMF keys. When pressed, the LCD displays “K_LOCK ON” for 1.5 seconds and the Enable Tone sounds. To restore normal operation of all keys, press and hold the key for at least 1.5 seconds. The LCD will display “K_LOCK OFF” and the Disable Tone will sound.

TAC Function - allows “talking around” the repeater by shifting the transmit frequency to the channel’s receive frequency. Pressing the key will cause the Enable Tone to sound and the LCD “TAC” indicator to begin blinking. Press the key again to disable the TAC function. The TAC function is automatically disabled when the channel is changed or the radio is powered off.

TX HI/LO Power - allows channels programmed for high power to be switched to low power. Activate by pressing and holding the key for at least 1.5 seconds. The LCD “LOW POWER” display will appear and the tone will sound. If pressed on channels already programmed for low power, an

Channel Selection

1.Up/Down Select - Press the Up/Down key (or ) display the desired channel. An up-select or down-select tone sounds with each change. If you press and hold either key, the radio changes channels rapidly.

(If programmed with a “stop”, channel changes will stop when the highest or lowest channel number has been reached.)

2.A/B/C Key Selection - Either or all three of the A, B and C keys may be programmed for instant selection of a pre-programmed channel. Press the programmed key to instantly select the programmed channel.

Transmit

1.Select the desired channel as indicated above.

2.Press the microphone PTT key. Keep the PTT button depressed while you transmit your message. Notice that the LCD TX indicator illuminates, indicating the transmit mode. If transmission is difficult, try to find a higher location with fewer obstructions between you and the repeater site. Release the PTT key when your message is finished.

3.For best voice quality when transmitting hold the microphone about one inch from your mouth.

Telephone Operation

1.Select a channel allowing telephone access.

2.Press the PTT to access the system then release to gain dial tone.

3.Transmit the number manually entered (requires a DTMF microphone) or recalled as described under Phone Book.

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Uniden SMH250D, SMU250K manual Busy Channel Lockout Bclo, C Key Functions, Channel Selection, Transmit, Telephone Operation