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121FT-857D Operating Manual
O
PTIONAL
H
IGH
S
TABILITY
R
EFERENCE
O
SCILLATOR
TCXO-9
The TCXO-9 provides high stability over a wide range of ambient temperatures, so as to
enhance digital-mode operating.
1. Turn the transceivers power off by pressing and holding in the POWER switch for one
second, then disconnect the DC cable from the INPUT jack on the rear panel of the
transceiver.
2. Referring to Figure 1, remove the seven screws affixing the top cover of the transceiver
then disconnect the speakers connector from the MAIN Unit.
3. Referring to Figure 2, locate the factory-installed REF UNIT on the board. Remove the
factory-installed REF UNIT from the board, then position the TCXO-9 so that its con-
nectors are aligned with the mounting pins on the board, and push it into place.
4. Replace the top case and its seven screws (remember to replace the internal speakers
plug).
5. TCXO-9 installation is now complete. Connect the DC cable to the INPUT jack.
I
NSTALLATION
OF
O
PTIONAL
A
CCESSORIES
BAND
DWN UP
TX/BU SY
DSP
MODE
BAND
DWN UP
TX/BUSY
DSP
MODE
TCXO-9
Mounting Location
Figure 1 Figure 2
MAIN UNIT
TCXO-9
123


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