E.F. Johnson Company 7780 Series, Preliminary Service Manual, Page: 15 / 116

2-1
November 1999
Part No. 001-7780-500
TRANSCEIVER OPERATION
SECTION 2 TRANSCEIVER OPERATION
2.1 FEATURES
2.1.1 GENERAL FEATURES
•
16 zones with home zone select
•
16 channels per zone (256 channels total)
•
Radio-wide scan
•
Time-out timer
•
LCD 8-character alphanumeric display with 12
status annunciators
2.1.2 CONVENTIONAL FEATURES
•
Channel scan with three user programmable scan
lists
•
Priority channel sampling
•
Busy channel lockout (transmit disable on busy)
•
Monitor mode
•
Call Guard® (CTCSS/DCS) squelch control
•
Penalty timer
•
Conversation timer
•
Repeater talk-around
•
DTMF/ANI signaling
•
User selectable power output
•
Selectable channel display mode
2.1.3 SMARTNET™ II FEATURES
•
Group, Enhanced Private Conversation™, Private
Conversation II™, and telephone calls
•
Call Alert™ (paging)
•
Emergency calls
•
Messaging
•
Priority monitor scanning
•
Failsoft operation
•
Dynamic regrouping
2.1.4 SMARTZONE® FEATURES
•
Site trunking
•
Site search
•
Site lock/unlock
2.1.5 LIMITED/ENHANCED KEYPAD
FEATURES
Limited (3-key) and Enhanced (15-key) models
of this transceiver are available. Most features avail-
able with the enhanced keypad model are also avail-
able with the limited keypad model. The features not
available with the limited (3-key) model are as
follows:
•
Since the DTMF keys are not available, it is not
possible to dial telephone numbers or manually
send DTMF tones. However, telephone calls can
still be placed using prestored numbers.
•
With conventional standard scanning, only one scan
list is available and it is not user programmable.
•
With SMARTNET/SmartZone operation, direct
entry of unit ID numbers is not available when
making private calls or sending pages. However,
these calls can still be made by recalling the ID from
a prestored list.
2.2 CONTROLS AND DISPLAY
2.2.1 TOP PANEL CONTROLS
On-Off Volume - Turning this knob clockwise turns
power on and sets the volume level. Turning it coun-
terclockwise to the detent turns power off.
Channel Select Switch - Selects up to 16 prepro-
grammed channels. The selected channel is also indi-
cated in the display.
Antenna Jack - Connection point for the antenna.
BATT
RX
TX
OFF/VOL
6
7
8
5
4
3
2
1
12
11
10 9
16
15
14
13
Transmitter
Keyed
Receive Signal
Detected
Low
Battery
On-Off/Vol
ume
Ant
enna Jack
Channel Select Sw