HTX-404 440 MHz UHF FM Transceiver
(190-1140)                 Advanced Operation         Faxback Doc. # 46640

This section describes some of your HTX-404's more advanced features.

Configuration Menu

Your HTX-404 has a configuration menu that lets you modify operation
settings. Each of the following sections explains how and when to use each
configuration setting.  Follow these steps to turn on the configuration
menu and select options.

1.  Press VF.

2.  Press F + M-SET. The first menu item appears.

3.  Press /\SC or \/SC to step down or up through the menu items. Rotate
    TUNE to change the setting for any menu item.

4.  Press PTT to exit the configuration menu and save all settings.

The configuration menu appears in the following order:

Code    Factory Default    Explanation

oS          5.000          Duplex separation (offset)
tc           oFF           Transmit sub-audible tone
rc           oFF           Receive sub-audible tone
Sr            20           Frequency step
Sc            ti           Scan resume
Sd           2.0           Scan delay time
S1         440.000         Lower scan range limit
S2         450.000         Upper scan range limit
ud            dn           Vacant channel scan direction
PS           1-16          Power save duty cycle
tE            oFF          Transmit inhibit
to            oFF          Transmit time-out
Lb             4           Priority-frequency channel lookback time
Ar            oFF          Touch-tone auto-reply

See the following sections for complete information regarding these

Duplex Separation Default

The duplex separation default (offset) controls the offset between the
transmit frequency and the receive frequency when you use the HTX-404 in
duplex mode, as with a repeater. Typically, on the 440 MHz band, repeaters
receive at a frequency 5 MHz lower or higher than they retransmit (repeat)
on. For example, if a repeater's input frequency is 444.340 MHz, its
output frequency is 449.340 MHz. The following is a list of the most
commonly used repeater pairs.

Output   Input    Output   Input    Output   Input    Output   Input

442.000  447.000  442.600  447.600  443.200  448.200  443.800  448.800
442.025  447.025  442.625  447.625  443.225  448.225  443.825  448.825
442.050  447.050  442.650  447.650  443.250  448.250  443.850  448.850
442.075  447.075  442.675  447.675  443.275  448.275  443.875  448.875
442.100  447.100  442.700  447.700  443.300  448.300  443.900  448.900
442.125  447.125  442.725  447.725  443.325  448.325  443.925  448.925
442.150  447.150  442.750  447.750  443.350  448.350  443.950  448.950
442.175  447.175  442.775  447.775  443.375  448.375  443.975  448.975
442.200  447.200  442.800  447.800  443.400  448.400  444.000  449.000
442.225  447.225  442.825  447.825  443.425  448.425  444.025  449.025
442.250  447.250  442.850  447.850  443.450  448.450  444.050  449.050
442.275  447.250  442.875  447.875  443.475  448.475  444.075  449.075
442.300  447.300  442.900  447.900  443.500  448.500  444.100  449.100
442.325  447.325  442.925  447.925  443.525  448.525  444.125  449.125
442.350  447.350  442.950  447.950  443.550  448.550  444.150  449.150
442.375  447.375  442.975  447.975  443.575  448.575  444.175  449.175
442.400  447.400  443.000  448.000  443.600  448.600  444.200  449.200
442.425  447.425  443.025  448.025  443.625  448.625  444.225  449.225
442.450  447.450  443.050  448.050  443.650  448.650  444.250  449.250
442.475  447.475  443.075  448.075  443.675  448.675  444.275  449.275
442.500  447.500  443.100  448.100  443.700  448.700  444.300  449.300
442.525  447.525  443.125  448.125  443.725  448.725  444.325  449.325
442.550  447.550  443.150  448.150  443.750  448.750  444.350  449.350
442.575  447.575  443.175  448.175  443.775  448.775  444.375  449.375

Output   Input

444.400  449.400
444.425  449.425
444.450  449.450
444.475  449.475
444.500  449.500
444.525  449.525
444.550  449.550
444.575  449.575
444.600  449.600
444.625  449.625
444.650  449.650
444.675  449.675
444.700  449.700
444.725  449.725
444.750  449.750
444.775  449.775
444.800  449.800
444.825  449.825
444.850  449.850
444.875  449.875
444.900  449.900
444.925  449.925
444.950  449.950
444.975  449.975

To operate with a repeater, you must transmit on the repeater's input
frequency and receive on the repeater's output frequency. If you
frequently use a repeater that does not have a 5 MHz offset, we recommend
you program the repeater frequency into one of the HTX-404's memories. You
can override the default offset for each memory.

To change the default offset, follow the steps in "Configuration Menu" to
display the oS menu item, and rotate TUNE to change the offset. The
HTX-404 lets you set the offset to be in the range from 0 MHz to 10 MHz in
steps as set by the frequency step option.

Tone-Coded Squelch (CTCSS)

Some repeaters require that you transmit a sub-audible tone to key-up the
repeater. You can set your HTX-404 to transmit any of the 38 standard
sub-audible tones. You can also limit incoming calls by setting your
HTX-404 to open the squelch only when someone transmits a sub-audible tone
you set.

To set a sub-audible transmit tone, follow the steps in "Configuration
Menu" to display tc. Then rotate TUNE to select the sub-audible tone. If
you do not want to transmit a sub-audible tone, rotate TUNE to select OFF.

To set a sub-audible receiver tone, follow the steps in "Configuration
Menu" to display rc. Then rotate TUNE to select the sub-audible tone. If
you do not want to use the receiver sub-audible tone to activate a
repeater, rotate TUNE to select OFF. Otherwise you only hear transmissions
that have the correct sub-audible tone when you activate tone squelch.

To turn on the sub-audible tone feature, press F + T-SQL. When you
transmit, the HTX-404 includes the sub-audible tone in the signal. To
receive, the incoming signal must have the correct sub-audible tone. You
can override the default sub-audible tones for any memory.

      Freq.         Freq.         Freq.         Freq.         Freq.
Code  (Hz)   Code   (Hz)   Code   (Hz)   Code   (Hz)   Code   (Hz)

XZ    67.0    ZZ    91.5   2b    118.8    5A    156.7   M2    210.7
XA    71.9    ZA    94.8   3Z    123.0    5B    162.2   M3    218.1
WA    74.4    ZB    97.4   3A    127.3    6Z    167.9   M4    225.7
XB    77.0    1Z   100.0   3B    131.8    6A    173.8   M5    233.6
WB    79.7    1A   103.5   4Z    136.5    6B    179.9   M6    241.8
YZ    82.5    1B   107.2   4A    141.3    7Z    186.2   M7    250.3
YA    85.4    2E   110.9   4B    146.2    7A    192.8
YB    88.5    2A   114.8   5Z    151.4    M1    203.5

Scan Options

Several menu items control how your HTX-404 operates when you scan. The
following sections describe how to set the frequency step rate, the scan
resume condition, the scan delay duration and the scan limits.

Frequency Step Rate

The frequency step rate affects the scanning mode, the tune control, and
/\SC or \/SC tuning. The factory default for the frequency step is 20 kHz.
When scanning, the HTX-404 scans up or down 20 kHz per step. To change the
frequency step rate, follow the steps in "Configuration Menu" to display
the Sr menu item, and rotate TUNE to change the frequency step rate. You
can set the step rate to 5, 10, 15, 20, 25, 50 or 100 kHz.

Scan Resume Condition

When you set the HTX-404 to scan either standard memories or the VFO mode,
the HTX-404 stops when it encounters a signal strong enough to break
squelch. At the factory setting, the HTX-404 resumes scanning in 10
seconds, even if the signal is still present. You can set scan resume to
one of the following.

ti    Resumes scanning in 10 seconds.

cr    Resumes scanning after the carrier drops and the scan delay expires.
      (See "Setting the Scan Delay").

SE    Does not resume scanning.

To change the scan resume condition, follow the steps in "Configuration
Menu" to display Sc. Then rotate TUNE to select the scan resume condition.

Note: The scan resume option does not affect priority scan.  Priority scan
      always resumes scanning after the carrier drops.

Scan Delay Duration

When you set the scan resume condition to cr (carrier), the HTX-404
resumes scanning after the carrier drops. The scan delay option lets you
set the HTX-404 to pause before resuming, so you can hear any reply.  The
factory default for this option is 2 seconds.

To change the scan delay duration, follow the steps in "Configuration
Menu" to display Sd. Then rotate TUNE to select the scan delay duration.
You can set the delay to 0.5, 1, 2 or 4 seconds.

Note: The scan delay option also affects priority scan.

Scan Limits

When you press F + \/SC or F + /\SC, the HTX-404 scans only those
frequencies within a range you set with the scan limit options. To set the
scan limits, follow the steps in "Configuration Menu" to display S1. Use
either TUNE or the key pad to enter one of the frequency limits.  Then
press \/SC to display S2 and enter the other frequency limit. You can
enter the higher frequency as either limit.

Vacant Scan Direction

The HTX-404's factory default for vacant scan is to scan down until it
finds an unused frequency. To change the vacant scan direction, follow the
steps in "Configuration Menu" to display ud. Then rotate TUNE to select
either UP or DN.

Power-Saving Feature

In the power-save mode, when the HTX-404 is not scanning, it turns on the
receiver for 1/20-second to check for any activity, and then turns off the
receiver for the time you set with the power-save configuration setting.
The factory default for this setting is to power down for 1/16 second.

To set the HTX-404 to save power, press F + SAVE until SAVE appears on the
display. To change the power save setting, follow the steps in
"Configuration Menu" to display PS. Then rotate TUNE to select the power
save setting. You can set the power-save setting to 1-2, 1-4, 1-8 or 1-16
(1/2, 1/4, 1/8 or 1/16 second).

Press F + SAVE again to turn off power save.

Preventing Transmissions

To prevent any transmissions using the HTX-404, turn on the transmit
inhibit function.

To turn on this function, follow the steps in "Configuration Menu" to
display tE. Then rotate TUNE to select oN. To enable transmissions, set
this option to OFF.

Limiting Transmissions Duration

When you communicate on the 70-CM band, you should keep your transmissions
as brief as possible.  Most repeaters have built-in timers that limit
single transmissions to 3 minutes or less. You can set the HTX-404 to stop
transmitting and sound a beep if you exceed a set time limit with a single

To set a transmit limit, follow the steps in "Configuration Menu" to
display to. Then rotate TUNE to select OFF, 30, 60 or 120 seconds.

Setting the Priority Scan Time

When you turn on priority scan, the HTX-404 checks the programmed
priority-frequency memories periodically to see if there is any activity.
As factory set, the HTX-404 checks the priority-frequency memories every 4

To change the priority scan time, follow the steps in "Configuration Menu"
to display Lb. Then rotate TUNE to select 4, 8, 12 or 16 seconds.

Using Touch-Tone Features

Your HTX-404 has a built-in 16-key touch-tone encoder. You can manually
send touch tones, or send the tones from one of five DTMF memories. You
can also set your HTX-404 so it is silent until it receives a specific
sequence of touch tones.

Manually Sending Touch Tones

Some repeaters require you to enter a touch-tone code to key-up the
repeater. Also, some repeaters have autopatch devices that let you make
telephone calls through the repeater. To manually send the required tones,
press and hold down PTT. Then enter the touch-tone digits.

Notes: You must press D twice to send the D touch tone.

       If the HTX-404's auto-reply feature is turned off, you can release
       PTT after you enter the first digit. The HTX-404 continues to
       accept and transmit the touch-tone signals until you pause at least
       1 second.

Storing a DTMF Memory Sequence

You can store frequently-used touch-tone sequences in the HTX-404's nine
DTMF memories. Each memory can hold up to 15 digits. Follow these steps to
store touch-tone sequences.

1.  Press and hold down F + DTMF for at least 1 second. The display
    changes to show the first DTMF memory.

2.  Press a digit from 1-9 to select one of the DTMF memories.

3.  Enter the touch-tone sequence (up to 15 digits).

4.  Press PTT to store the sequence and exit the DTMF memory store mode.

To store additional sequences, repeat the above steps.

Note: You must program DTMF memory 1 to use the auto-reply feature.
      (See "Automatically Sending a DTMF Replay.")

Transmitting A DTMF memory Sequence

To send a DTMF memory sequence, press and hold down PTT. Then press D
followed by the DTMF memory number you want to transmit (1-9). The HTX-404
transmits the tones.

The HTX-404 has two DTMF memory sequence transmit speeds.  To switch
between fast and slow, press and hold down PTT.  Press D.  Then press 0.

Note: If the auto-reply feature is turned off, you can release PTT after
      you press D. Enter the DTMF memory number within 1.5 seconds.

Using DTMF Squelch for Paging

The DTMF squelch feature lets you set your HTX-404 to release the squelch
only if it receives a specific touch-tone sequence. Follow these steps to
set that touch-tone sequence.

1.  Press F + D-SQL for at least 1 second.

2.  Enter the sequence (up to seven digits).

3.  Press PTT to save the sequence.

To turn on the DTMF squelch, press F + D-SQL for less than 1 second. DTMF
appears on the display.

Your HTX-404 remains silent until it receives the correct touch-tone
sequence. Then it beeps and returns to normal operation. To cancel DTMF
squelch, press F + D-SQL for less than 1 second so DTMF disappears from
the display.

Automatically Sending a DTMF Reply

You can set your HTX-404 to automatically transmit the touch-tone digits
stored in DTMF Memory 1 when you enable DTMF squelch and the HTX-404
receives the correct touch-tone sequence. To turn on DTMF auto-reply,
follow the steps in "Configuration Menu" to display Ar. Then rotate TUNE
select on.

You should also set this option to on if you expect an auto reply from an
auto patch, another HTX-404, or other transceiver that has this feature.

Note: You must program a DTMF sequence in DTMF Memory 1 for the auto-reply
      feature to operate.

(EB 3/3/98)

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