47
TK-880
ADJUSTMENT
Test Mode
■
Test Mode Operating Features
This transceiver has a test mode.
To enter test mode,
press [B] key and turn power on. Hold [B] key until test
channel No. and test signalling No. appears on LCD.
Test mode can be inhibited by programming. To exit test
mode, switch the power on again. The following functions
are available in test mode.
• Controls (“SFT” appears)
[PTT]
Used when making a transmission.
[
■
]
Shift off.
[A]
FFSK 1200 bps and 2400 bps.
[B]
Shift off.
[C]
Compander function on and off.
[D]
Beat shift on and off.
[CALL]
Shift off.
[Channel Up/Down]
Shift off.
[Volume Up/Down]
Shift off.
• Controls (“SFT” not appears)
[PTT]
Used when making a transmission.
[
■
]
Monitor on and off.
[A]
Sets to the tuning mode.
[B]
Shift on.
[C]
RF power high and low.
[D]
Changes signalling.
[CALL]
Changes wide, Semi-wide and nar-
row
[Channel Up/Down]
Changes channel
[Volume Up/Down]
Volume up/down.
Note :
If a [A], [B], [C], [D] key is pressed during transmis-
sion, the DTMF corresponding to the key that was pressed
is sent.
• LCD indicator
“SCN”
Unused
“ ”
Lights at compander on.
“AUX”
Unused.
“P”
Lights at RF power low.
“MON”
Lights at monitor on.
“SVC”
Unused.
“ ”
Lights at FFSK 2400 bps.
• LED indicator
Red LED
Lights during transmission.
Green LED
Lights when there is a carrier.
• Sub LCD indicator
“SFT”
Appears at shift on.
■
Frequency and Signalling
The set has been adjusted for the frequencies shown in
the following table. When required, re-adjust them follow-
ing the adjustment procedure to obtain the frequencies you
want in actual operation.
• Frequency (MHz)
Channel
E,E4
E3
No.
RX
TX
RX
TX
1
455.05000
455.10000
428.05000
419.10000
2
440.05000
440.10000
406.05000
406.10000
3
469.95000
469.90000
449.95000
431.90000
4
455.00000
455.00000
428.00000
428.00000
5
455.20000
455.20000
428.20000
428.20000
6
455.40000
455.40000
428.40000
428.40000
7~16
–
–
–
–
• Signalling
Signalling No.
RX
TX
1
None
None
2
None
100Hz square
3
QT 67.0Hz
QT 67.0Hz
4
QT 151.4Hz
QT 151.4Hz
5
QT 210.7Hz
QT 210.7Hz
6
QT 250.3Hz
QT 250.3Hz
7
DQT 023N
DQT 023N
8
DQT 754I
DQT 754I
9
DTMF DEC, (159D)
DTMF ENC, (159D)
10
None
DTMF tone 9
11
2-tone (321.7/928.1Hz)
None
12
Single tone 1200Hz
Single tone 1200Hz
13
5-tone DEC. (EIA #12345)
5-tone ENC. (EIA #12345)
14
None
FFSK
15
FFSK code
FFSK code
■
Preparations for Tuning the Transceiver
Before attempting to tune the transceiver, connect the
unit to a suitable power supply.
Whenever the transmitter is turned, the unit must be
connected to a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a
4
Ω
dummy load and connected to an AC voltmeter and an
audio distortion meter or a SINAD measurement meter at all
times during tuning.
■
Transceiver Tuning
(To place transceiver in tuning mode)
Channel appears on LCD. Set channel according to tun-
ing requirements.
LCD display (Test mode)
1
n
1
–
Channel No.
W/SW/N
Signalling No.
Содержание TK-880 series
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