Kenwood Tk 780h1 Owners Manual

© 2001-5 PRINTED IN JAPAN
B51-8581-00 (
N)
 1370
VHF FM TRANSCEIVER
TK-780/ H
SERVICE MANUAL
GENERAL .................................................................  2
OPERATING FEATURES .........................................  3
REALIGNMENT ......................................................  15
INSTALLATION ......................................................  20
CIRCUIT DESCRIPTION .........................................  28
SEMICONDUCTOR DATA .....................................  33...

2
TK-780/ H
GENERAL
INTRODUCTION
SCOPE OF THIS MANUAL
This manual is intended for use by experienced techni-
cians familiar with similar types of commercial grade com-
munications equipment. It contains all required service infor-
mation for the equipment and is current as of this publica-
tion date. Changes which may occur after publication are
covered by either Service Bulletins or Manual Revisions,
which are issued as required.
ORDERING REPLACEMENT PARTS
When ordering replacement parts or equipment...

3
TK-780 / H
5. INSTALLATION PLANNING – CONTROL STATIONS
5-1. Antenna system
Control station. The antenna system selection depends
on many factors and is beyond the scope of this manual.
Your KENWOOD dealer can help you select an antenna sys-
tem that will best serve your particular needs.
5-2. Radio location
Select a convenient location for your control station radio
which is as close as practical to the antenna cable entry
point. Secondly, use your system’s power supply (which
supplies the voltage and...

4
TK-780/ H
2-2. Programmable Keys
The FPU (KPG-49D) enables programmable keys to se-
lect the following functions.

Conventional format
AUX-A, AUX-B (Only when voice scrambler is not se-
lected), Channel down, Channel up, DTMF ID (BOT), DTMF
ID (EOT), Display character, Emergency (Only foot key),
Function, Group down, Group up, Home channel, Horn alert,
Key lock, Memory (RCL/STO), Memory (RCL), Memory
(STO), Monitor A, Monitor B, Monitor C, Monitor D, Opera-
tor selectable tone, Public address, Redial,...

5
TK-780 / H
•Message mode
Press this key to enter the message mode. (See “Alpha-
numeric Two-way Paging Function” for details)
•Memory
This key allows DTMF memory data to be recalled; up to
32 memories each with a memory dial of up to 16 digits and
an A/N of up to 10 digits per memory.
•Monitor
Used to release signalling or squelch when operating as a
conventional.  It is also used to reset option signalling.
•Operator selectable tone (Conventional format)
This key switches the pre-set decode QT/DQT and...

6
TK-780/ H
2-3. Front Panel Displays and Indicators
1Sub display
Displays the system, channel and group numbers.  Also
displays various functions, such as TA.
2P (Priority) indicator
The P indicator () appears when a selected channel is
programmed as priority, in conventional operation.
3MON (Monitor) indicator
The MON indicator appears when the button pro-
grammed as MONITOR is pressed.
4SVC (Service) indictor
This icon is not used this transceiver.
5SCN (Scan) indicator
The SCN indicator appears when...

7
TK-780 / H

System lockout
The system lockout feature is used to lock systems out
of the scan sequence, and can be selected by programming
in the following two ways;
•Fixed lockout
The system to be locked out is selected by programming.
When a locked system is selected, the Delete (
) indicator
appears on the left of the SYSTEM indicator.  The revert sys-
tem is scanned even if it is locked out.  If there is a locked
system, the Delete (
) indicator flashes during fixed scan-
ning.
•User selectable...

8
TK-780/ H

SCAN start condition
One or more non-priority channels must be added to all
channels that can be scanned.  The transceiver must be in
normal receive mode (PTT off).
When you activate the key programmed to the scan func-
tion, the scan starts.  The scan icon “SCN” lights and “–
SCAN–” or revert channel (programmable) is indicated on
alphanumeric display.

Scan stop condition
The scan stops temporarily if the following conditions are
satisfied.
1) A carrier is detected, then signalling matches...

9
TK-780 / H

Sub LCD display
You can use 3-digit the display to display the system
number, channel number or group number.  It is useful
when the main (12-digit) display indicates system, group or
channel name or other functions.

Selective call alert LED
You can select whether or not the LED on the transceiver
flashes in an orange color when selective call was occurred.

PTT ID
PTT ID provides a DTMF or MSK (FleetSync™ : Fleet-ID)
ANI to be sent with every time PTT (beginning of transmis-
sion, end of...

10
TK-780/ H
OPERATING FEATURES
4-2. Trunking Format

Call indicator
The call indicator can be programmed for each group.  In
trunked system, it can be set to respond to a selectable de-
code ID or one of two fixed IDs, except block IDs.  When a
call is received with a selectable decode ID, the call indicator
flashes.  When a call is received with a fixed ID, the call
indicator lights continuously.
On a conventional system, the call indicator can be pro-
grammed to light for each QT or DQT code.  It...