HTX-242 Two-Meter Mobile Transceiver
(190-1126)                 Advanced Operation         FaxBack Doc.  #19147

ADVANCED OPERATION

Frequency Offset Defaults

When you select a frequency, the HTX-242 defaults to the following
frequency offsets if auto duplex is turned on:

Receive Frequency          Transmit Offset

Below 144.600 MHz          No offset (Simplex)
144.600 to 144.905 MHz     + offset
144.910 to 145.205 MHz     No offset (Simplex)
145.210 to 145.505 MHz     - offset
145.510 to 146.005 MHz     No offset (Simplex)
146.010 to 146.375 MHz     + offset
146.380 to 146.605 MHz     No offset (Simplex)
146.610 to 146.995 MHz     - offset
147.000 to 147.395 MHz     + offset
147.400 to 147.595 MHz     No offset (Simplex)
147.600 to 147.995 MHz     - offset
148.000 MHz and above      No offset (Simplex)

The default offset is 600 kHz.  For example, if you tune to receive 146.940
MHz, the HTX-242 automatically transmits at 146.340 MHz (600 kHz less than
146.940).

NOTE:  Outside these ranges, the HTX-242 operates with no offset.

Turning Auto Duplex On and Off

The HTX-242 can automatically select the correct duplex offset for
frequencies normally assigned to repeaters and selects no offset (simplex)
for other frequencies.  Follow these steps to turn this option on or off.

1.  Press VFO.

2.  Hold F for at least 1 second.  FUNC flashes.

3.  Press MR.

4.  Repeatedly press UP ARROW or DOWN ARROW until the HTX-242 displays AS
    and either on (if the option is on) or oFF (if the option is oFF).

5.  Rotate TUNE, or press UP or DOWN on the microphone, to select on or
    oFF.

6.  Press MR or PTT to save the setting.

Changing the Default Offset

Follow these steps to change the default offset for the VFO modes.

1.  Press VFO.

2.  Hold F for at least 1 second.  FUNC flashes.

3.  Press SHIFT.  The HTX-242 displays oS and the current offset (in MHz)

4.  Rotate TUNE, press UP or DOWN on the microphone, or directly enter the
    step using the microphone's keypad to select an offset default
    (from 0 to 38 MHz)

5.  Press SHIFT or PTT to save the setting.

    NOTE:  This setting does not affect frequencies already stored in
           memory.

Reversing the Offset

To reverse the transmit and receive frequencies when you operate duplex,
press F then REV.  For example, if you tune to 146.940 (which has a -
offset), pressing F then REV makes the transceiver receive on 146.340 and
transmit on 146.940.  The setting returns to the default if you change
frequencies.

Using the Dual VFOs for Duplex Operation

Follow these steps to use one VFO to transmit and the other to receive.

1.  Press VFO to select VFO-A.

2.  Select a frequency.

3.  Press VFO to select VFO-B.

4.  Select a frequency.

5.  Press DUP.

    When the HTX-242 displays:

    VFO-A-T

    VFO-B

    It transmits on the VFO-A frequency and receives on the VFO-B
    frequency.

    When it displays:

    VFO-A

    VFO-B-T

    It transmits on the VFO-B frequency and receives on the VFO-A
    frequency.


(SP 02/16/96)