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For working on repeaters with odd splits, or communicating with astronauts on orbiting space
vehicles, it may be necessary to use non-standard splits between the receive and transmit
frequency. If the application is infrequent enough not to warrant the dedication of a memory
channel for this purpose, the "VFO Split" mode may be used. Here is the procedure:
1.
Press the [VFO(PRI)] key, as needed, to select VFO-A. Set VFO-A for the receiving
2.
Now press the [VFO(PRI)] key, and set VFO-B for the desired transmit frequency (e.g.
144.750 MHz).
3.
Press the [VFO(PRI)] key once more to re-establish VFO-A as the "Main" (receive) VFO.
4.
Press the [F/W] key, then press the [0(SET)] key to enter the Set mode.
5.
Rotate the DIAL to select Set Mode Item 43: SPLIT.
6.
Press the [F/W] key, then rotate the DIAL to set this function "ON."
7.
Press the PTT key once to save the new setting and exit to normal operation.
8.
You will now be operating in a Split mode. When you press the PTT key to transmit, you
will observe that VFO-A and VFO-B will reverse positions. The VFO selection indicator
"-b-" will blinks while the transceiver is transmitting, this means that the VFO Split feature
is now activated.
9.
If you need to modify the VFO-B (transmit) frequency (for Doppler Shift correction, etc.),
just press the [VFO(PRI)] key, then make the necessary change, then press [VFO(PRI)]
key once more to restore VFO-A to the "receive VFO" position.
10. When you have finished with Split operation, re-enter the Set mode, and set Set Mode
Item 43: SPLIT to "OFF."
A split frequency pair set up via the VFO Split feature cannot be stored directly into memory.
You can, however, store odd frequency pairs using a different (slightly simpler) procedure.
See page ??.
CTCSS Operation
Many repeater systems require that a very-low-frequency audio tone be superimposed on
your FM carrier in order to activate the repeater. This helps prevent false activation of the
repeater by radar or spurious signals from other transmitters. This tone system, called
"CTCSS" (Continuous Tone Coded Squelch System), is included in your VX-120/170, and is
very easy to activate.
R.F. Says: CTCSS setup involves two actions: setting the Tone Mode and then setting of the
Tone Frequency. These actions are set up by using the [1(SQ TYP)] key and [2(CODE)]
keys.
CTCSS/DCS/EPCS Operation
16/64
FCC ID: K6620223X20
IC ID: 511B-20223X20
VX-120/170 O
PERATING
Vertex Standard Co., Ltd.
M
ANUAL
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