TM-271A/271E
20
ADJUSTMENT
Adjustment Mode
In Adjustment Mode, the transceiver can adjusted using
its panel keys.
■
Items that can be adjusted in Adjustment Mode
*1
1. Frequency Tune
2. Transmit High Power *2
3. Transmit Low Power *2
4. DCS Balance *3
5. Max Deviation *3
6. CTCSS Fine Deviation *3
q
Blinks in Adjustment Mode.
w
Adjustment item display
e
Adjustment value display. Can be adjusted while it is
“blinking”.
Displayed as a hexadecimal number from 00 to FF.
r
Adjustment value stored in memory.
When an adjustment value is determined, it is equal to the
value in “3”.
■
Panel Key Operation Method in Adjustment Mode
q
Power switch/Volume control
w
When the knob is pressed once, the adjustment value dis-
play blinks. (Select an adjustment item with “4” or “5”
key before performing the operation. It cannot be per-
formed while transmitting.)
When the knob is rotated while the adjustment display is
blinking, the adjustment value changes. (Adjust transmis-
sion items while transmitting.)
When the knob is pressed again, the adjustment value
stops blinking and lights, and the adjustment value is
saved in the memory of the transceiver. (For transmission
item adjustment, enter receive mode before performing
the operation.)
e
Changing between adjustment value display and fre-
quency display
The display changes as follows : Adjustment value display
→
Transmit frequency display
→
Receive frequency dis-
play
→
Adjustment value display.
The frequency for adjustment can be confirmed.
r
Moves the adjustment item backward. (If it is operated
when a frequency is displayed, the adjustment item dis-
play returns.)
t
Moves the adjustment item forward. (If it is operated
when a frequency is displayed, the adjustment item dis-
play returns.)
y
If it is pressed before determining the adjustment value,
the adjustment value of the Adjustment item returns to its
original value.
u
Not used in Adjustment Mode.
Note :
If Max Power for transmission is low, check the DC cable.
If the DC cable connector has poor contact due to rust or
stain, voltage may drop occur frequently and correct trans-
mission power may not be supplied.
In this case, polish the DC cable connector. If the problem
still persists, replace the DC cable with a new one.
r
w
e
q
TM-271
MENU
q
w
e
r
t
y
u
TX-RX unit
Component side
7. DCS Fine Deviation *3
8. DTMF Fine Deviation
9. Band Pass Tuning *4
10. Squelch Tight *5
11. Squelch Open *5
12. S-Meter S1 Level
13. S-Meter Full Level
Note :
*1 : The PLL lock voltage and Max Power Alignment for
transmission cannot be adjusted in Adjustment Mode.
*2 : Adjusted in 5 points in the transmission operating fre-
quency range.
*3 : Adjusted in 3 points for the Wide Band Width in the
transmission operating frequency range.
Adjusted in 1 point for the Narrow Band Width
*4 : Adjusted in 3 points in the reception operating frequency
range.
*5 : Adjusted in 3 points for the Wide Band Width in the re-
ception operating frequency range.
Adjusted in 1 point for the Narrow Band Width
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How to Enter Adjustment Mode
To perform adjustments with transceiver panel keys, the
transceiver must be set to “Adjustment Mode”.
While shorting the following figure terminals on the PCB
with tweezers, etc., turn the power switch ON to enter Ad-
justment Mode. (See Fig. 1.)
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LCD Display When Adjustment Mode is Enabled
Example of Frequency Tune. See “Table 1” for an LCD
display list.
Fig. 1
Fig. 2
Fig. 3
