E.F. Johnson Company 761X Service Manual Download

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OPERATION

3-6

November 1998
Part No. 001-7600-001

3.5.5 CALL GUARD TONE SELECT

If the transceiver has a

key, the Call

Guard (CTCSS) tone can be selected. This allows calls
to be placed to different mobiles or groups of mobiles
and received on different groups than is normal for the
channel. Proceed as follows:

1. Press the

key and “TON--x” is displayed.

2. Press the channel up/down (

) keys to

select the desired tone (“TON--1” to “TON--9”).

3. Press the

key again to exit this mode. Calls

are then placed on the current channel and other
channels using the new code until it is changed.

4. To reselect the standard Call Guard squelch tone

programmed for the channel, select “TON--M”
using the same procedure.

3.5.6 CHANNEL SELECT

Refer to Section 3.3.5.

3.5.7 DTMF NUMBER SELECT

If the transceiver has a

key, up to seven

preprogrammed telephone numbers can be transmit-
ted. Proceed as follows:

1. Press the

key and the currently selected

number is indicated as “DTMF x”.

2. Press the channel up/down keys (

) to

select a different number.

3. To transmit the selected number on the current

channel, press and hold the

key.

NOTE: The DTMF 6 number is used for emergency
calls and the DTMF 7 number is used for automatic
logging. Therefore, if these features are used, the
number may not be available for regular calls.

3.5.8 EMERGENCY KEY

Press and hold the

key to transmit an

emergency call. To cancel this call before it is trans-
mitted, press and hold this key again. Once emergency

transmission begins, the call cannot be canceled. Pro-
gramming determines the channel on which the call is
transmitted and also if it is transmitted once or repeat-
edly until a control code is received.

3.5.9 LOCK KEY

Press and hold the

key to lock all pro-

grammable keys except

and

Either “LK ON” or “LK OF” is displayed to indicate
the current condition. If a locked key is pressed, all
that happens is “LOCK” is displayed.

3.5.10 MONITOR MODE SELECT

Refer to Section 3.4.4.

3.5.11 OUTPUT POWER SELECT

The

and

keys can be used

to temporarily or permanently override the pro-
grammed power output for the channel. The program-
ming of the “RF Power Selection” parameter in Table
4-2 determines operation. Pressing the key once
selects the level on the key and pressing it again
selects the programmed level.

3.5.12 PRIORITY CHANNEL SELECT

Pressing

selects the priority A channel

and pressing

selects the priority B channel.

The

key can also be programmed so that press-

ing and holding the key makes the current channel the
priority A channel. Refer to Section 3.6.3 for more
information.

3.5.13 RECEIVE ATTENUATE

Pressing the

key turns receive signal

attenuation on and off. Either “AT ON” or “AT OF” is
displayed to indicate the current mode. The attenuator
can be turned on if nearby strong RF signals such as
commercial radio stations or pager transmitters are
causing distortion of the receive signal.

3.5.14 SCAN SELECT

Pressing the

key turns the channel scan

feature on and off. Refer to Section 3.6 for more
information.

TONE

DTMF

EMER

LOCK

CALL

MONI

EMER

HIGH