General Information; Service; Cleaning; Ordering Spare Parts - Kenwood TM-3530A Instruction Manual

4-8-9. DCL system notes
1. Standby digital code
The standby indicator is a visual indication of which
digital access codes will actually open the squelch on
the radio. Simply stated it shows the "Active" codes.
When the indicator is "ON" the code is active, when
the indicator is "OFF" the code is not active, and is ig-
nored,
Fig. 1 illustrates an example code with the standby in-
dicator "ON" {active}.
The code that is displayed when the CS key is pressed
"ON" (called a "Transmit digital code") becomes an
active code regardless of the standby indicator. For
example, the digital codes as shown in Fig. 2 are
stored in station A's memory. Digital codes a, b and d
are active codes. If station B transmits the proper
code (a, b or d) he will open the squelch of station A.
When station A receives one of the active digital
codes, the microprocessor will determine if the re-
ceived code matches the current transmit code. If the
codes do not match, the microprocessor will change
the transmit digital code so that it matches the incom-
ming digital code.
For example, if station B transmits a signal with code
d (Fig. 2), the squelch of station A will open. Simulta-
neously, station A''s transmit digital code (a in Fig. 2)
will be changed to d. This may be confirmed by press-
ing the CS key. Code d will be displayed.
2. If the CHL indicator CHL is "ON" you will not be able
to initiate, or receive channel linkage information.
This is to prevent accidental channel linkage.
3. Detection of open channel
The DCL system detects the presence of an open
channel by determining if the signal level is below ap-
prox.—14 dBy (0,2 uv) for approx. 1.5 seconds, Occa-
sionally, channel linkage may occur on a busy channel
due to transients in the microprocessor.
4. Automatic transmission of channel linkage data is not
performed after finding an open channel, if another
station is transmitting on the original channel at the
time the radio returns to the original channel. The ra-
dio will enter the receive mode, and waits for a com-
mand to send the data.
5. Channel linkage during scan operation
Channel linkage cannot be actuated during scanning.
32
. Normal transmission using PTT switch
When the DCL switch is ON, data is transmitted for
approx. 0.2 seconds at the beginning and at the end-
ing of the transmission: Wait a short period before
start talking after this moment.
. Offset switch
When the |OS| key is not set to simplex, automatic
transmission of DCL data from the origina! frequency
does not occur, Pressing the PTT switch manually
transmits data and causes movement to the open
channel.
. When channel linkage is initiated, the original operat-
ing frequency, offset and tone frequency are stored
into memory. The open channel operates in simplex
with no tone, regardless of original settings.
5-1. GENERAL INFORMATION
5-2. SERVICE
Should it ever become necessary to return the equipment
to your dealer or service center for repair, pack it in its
original box and packing, and include a full description of
the problems involved. Also include your telephone
number. You need not return accessory items unless dir-
ecily related to the service problem. If you do include ac-
cessory items please list them in your correspondence.
You may return your radio for service to the Authorized
TRIO-KENWOOD Dealer from whom you purchased it. A
copy of the service report will be returned with the unit.
Please do not send sub-assemblies or printed circuit
boards. Send the complete unit, in its original boxes and
packing.
Piease mention the model and serial number of your ra-
dio in any correspondence, whether phone or written.
For future reference, record this information in the space
provided on the back cover of this manual.
Service note:
Dear OM, if you desire to correspond on a technical or
5-3. CLEANING
The knobs, front panel and cabinet of the transceiver are
likely to become soiled after extended use. The knobs
should' be removed from the transceiver and cleaned
Please list: Model and serial number.
The question or problem you are having.
Please give sufficient detai! to diagnose:
other equip-
ment in the station, meter readings and anything you feel
might be useful in attempting diagnosis.
Notes:
Caution: .
Do not pack the equipment in crushed newspapers for
shipment! Extensive damage
may result, during ship-
ping.
Z
5-5. ORDERING SPARE PARTS
Note:
When the lithium battery is replaced, the microprocessor
must be reset, using the procedure on page 35.