High-Stability Reference Oscillator Tcxo-9 - Yaesu FT-817ND Operating Manual

O H
PTIONAL
The TCXO-9 provides high stability over a wide range of ambient temperatures, so as to
enhance digital-mode operating.
1. Turn the transceiver's power off by pressing and holding in the
second, then remove the FBA-28 Battery Case or FNB-85 Ni-MH Battery Pack from
the transceiver. Additionally, disconnect the DC cable from the INPUT: 13.8V
on the rear panel of the transceiver, when operating the FT-817
supply.
2. Referring to Figure 1, remove the shoulder belt bracket and its two screws from both
side of the transceiver, then remove the five screws affixing the top case of the trans-
ceiver, and remove the top case; disconnect the speaker's connector when you remove
the top case.
3. Referring to Figure 3, 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 (remember to replace the internal speaker's plug), and connect the
FBA-28 Battery Case or FNB-85 Ni-MH Battery Pack (and/or attach the DC power
supply).
5. TCXO-9 installation is now complete.
FT-817 Operating Manual
ND
I
NSTALLATION OF
-S
IGH TABILITY
O
PTIONAL
R O
EFERENCE
Figure 3
A
CCESSORIES
TCXO-9
SCILLATOR
switch for 1/2
with a DC power
ND
jack
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