Radio Shack HTX-420 User Manual

Page 8

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(TNC). See the following diagram for a
suggested connection. Refer to your TNC
instructions for details.

1%-+0)

6*'

';2#&

To lock the transceiver’s keypad so you do
not accidentally change a setting, press

LOCK

(

). This locks all buttons except

PTT

PWR

, and

To unlock the keypad, press

LOCK

(

)

again.

+)*6+0)

6*'

+52.#;

When you press any key except

PTT

, the

backlight turns on for about 5 seconds. Press

to turn on the backlight.

740+0)

6*'

10'

#0&

((

The transceiver is preset to sound a beep
each time you press a key. To turn off the
beep, press

BEEP

E<<

briefly appears.

To have the beep sound again, press

BEEP

again.

'66+0)

6*'

4'37'0%;

6'2

Follow these steps to change the frequency
increment used during scanning and
stepping to a frequency.

1. Press

STEP

IJ;Fý

and the current step

setting (in kHz) appear.

2. Repeatedly press

until

the desired new setting appears. You
can change the frequency step to 5 kHz,
6.25 kHz, 7.5 kHz, 10 kHz, 12.5 kHz, 15
kHz, 20 kHz, 25 kHz, or 50 kHz.

3. Press

PTT

to store your selection.

19'4

#8'

Power save conserves battery power by
turning off power to the receiver part of the
transceiver and turning it on briefly every 8
seconds to check for a transmission.

To enable power save, press

(

appears.

To disable power save, press

(

disappears.

5+0)

761

19'4

*761((

Follow these steps to have the transceiver
automatically turn off after a preset period of
non-use.

1. Press

APO

(

). Auto Power Shutoff is

normally disabled.

e<<

appears.

2. Repeatedly press either

, or

turn

to select a time period until

power shutoff. You can select

e<<

'(&

minutes.

3. Press

PTT

to store your selection

and exit.

To turn off auto power-shutoff, press

APO

again and select

e<<

+/+6+0)

4#05/+6

74#6+10

+/'

+/'4

When you communicate using repeaters,
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 transceiver to stop
transmitting if you exceed a set time limit with
a single transmission.

To set a value for the time-out timer, press

TOT

(

). The default setting

e<<

appears

along with

JEJ

. Repeatedly press

or turn

to select the desired time-out

interval (up to 20 minutes). When you select
a value for the time out feature,

JEJ

appears.

Press

PTT

to store the setting and exit

to the VFO mode.

70+0)

6*'

'#6*'4

#&+1

(

4'37'0%+'5

The transceiver can receive seven NOAA
(National Oceanographic and Atmospheric
Administration) weather broadcast
frequencies. To listen to the channel
broadcasting in your location, repeatedly
press

to select the weather band.

appears. Then rotate

or repeatedly press

to select your local weather

channel from the following table.

5+0)

6*'

"5#/'"#

.'46

Traditional weather radios simply receive the
NOAA weather broadcast (usually within a
40-mile radius), then sound an alarm if any
emergency code was transmitted along with
the broadcast. People who live outside an
affected area are often alerted even when
their area is not affected, causing many of

HTX-420

TNC

Computer

"016'"

•

When the transceiver receives no signal
within an 8-second period,

begins flashing

indicating power save is active.

•

When the transceiver receives a signal
during the 8-second period,

remains

steady.

•

The green signal indicator lights to indicate
that a signal has been received and that
power save is on stand-by.

•

To use the transceiver for packet
communications, disable power save (see
“Using the Transceiver with Packet Radio”
on Page 7).

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9>#'

162.400

9>#(

162.425

9>#)

162.450

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162.475

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162.500

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162.525

9>#-

162.550

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