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Please be advised that the NC-88 may contribute noise to TV and radio reception in the
immediate vicinity, so we do not recommend its use adjacent to such devices.
Low Battery Indication
As your battery discharges during use, the voltage will gradually become lower. When the
battery voltage is becoming too low for reliable operation, the "BATTERY" icon will blink
on the LCD display, indicating that the battery pack must be recharged before further use.
Avoid recharging Ni-MH batteries before the "Low Battery" indicator is observed, as this
can degrade the charge capacity of your Ni-MH battery pack.
Installation of FBA-25A Alkaline Battery Case (option)
The optional FBA-25A Battery Case allows operation of the VX-120/170 using six "AA" size
Alkaline batteries.
When installing batteries, insert the (–) end first, then press in the (+) end so the battery
snaps into place. Always replace all six batteries at the same time, paying attention to the
polarity indicated inside the case.
The FBA-25A must not be used with rechargeable cells. The FBA-25A does not contain the
thermal and over-current protection circuits (provided in the "FNB" series of Ni-MH Battery
Packs) required when utilizing Ni-Cd and Ni-MH cells.
Note that the power output and battery life will be much shorter when using Alkaline AA cells.
They should be considered an emergency backup power source only, for this reason.
The VX-120/170 may be used for Packet operation, using the optional CT-44 microphone
adapter (available from your Yaesu dealer) for easy interconnection to commonly-available
connectors wired to your TNC. You may also build your own cable, using a four-conductor
miniature phone plug, per the diagram below.
The audio level from the receiver to the TNC may be adjusted by using the VOLUME knob,
as with voice operation. The input level to the VX-120/170 from the TNC should be adjusted
at the TNC side; the optimum input voltage is approximately 5 mV at 2000 Ohms.
Be sure to turn the transceiver and TNC off before connecting the cables, so as to prevent
voltage spikes from possibly damaging your transceiver.
When you are operating on Packet, switch the Receive Battery Saver OFF, as the "sleep"
cycle may "collide" with the beginning of an incoming Packet transmission, causing your TNC
not to receive the full data burst. See page 59 for details regarding Battery Saver setup.
Interface of Packet TNCs
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FCC ID: K6620223X20
IC ID: 511B-20223X20
VX-120/170 O
PERATING
Vertex Standard Co., Ltd.
M
ANUAL
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