RadioShack FM Mobile Transceiver HTX 252 Owners Manual

21
2. Hold the microphone about 3 inches from your mouth.
3. Hold down the ribbed transmit button on the side of the
microphone, then speak slowly and clearly into the micro-
phone. appears while you transmit, and signal strength
bars appear on the bottom to indicate the relative transmit-
ting signal output.
Note: If you try to transmit outside the transmit frequency
range, 
E appears instead of   to indicate you are out-
side the transmitting range.
4. Release the transmit button
 when you finish...

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UNDERSTANDING REPEATERS
Operating through a repeater, where you transmit on one fre-
quency and receive on another, is called 
duplex operation. Oper-
ating direct to another station, where you transmit and receive on
the same frequency, is called 
simplex operation.
A repeater is a station that receives a signal on one frequency
(the 
input frequency) and then retransmits that signal on a differ-
ent frequency (the 
output frequency). Repeater antennas are typ-
ically located at the tops of tall...

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SETTING THE REPEATER OFFSET 
FREQUENCY
Note: This setting affects only the VFO mode. If you saved a re-
peater offset in a memory, that setting is not affected.
1. Press 
F+SHIFT (LOCK). The offset frequency and   appear.
2. While the offset frequency appears, rotate the tuning control
or repeatedly press 
UP or DN until the desired offset
appears. The transceiver’s default repeater offset is 600
kHz, which appears as 
0.60 (MHz). You can select a
value from 100 kKz to 8.000 MHz.
3. Press 
PTT to...

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REVERSING THE TRANSMIT AND 
RECEIVE FREQUENCIES
To swap the input and output frequencies, press REV. For exam-
ple, if you have set the transceiver to repeater operation on
146.94 MHz with a positive offset of 600 kHz, the transceiver
would normally receive on 146.94 MHz and transmit on 147.54
MHz. After you press 
REV, the transceiver is set to receive on
147.54 MHz and transmit on 146.94 MHz. 
This feature is useful if you want to determine whether you are
close enough to another station to...

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MEMORY OPERATION
Your transceiver has 10 standard memory locations that you can
use to store frequencies for quick access. You can also store oth-
er settings for each memory location, such as the repeater offset
and the CTCSS tones.
STORING A TRANSMIT/RECEIVE 
FREQUENCY
1. Select the frequency you want to store by using the tuning
control or 
UP/DN. 
2. If desired, select an offset frequency, offset direction, and
CTCSS frequency for the selected frequency (see “Setting
the Repeater Offset Frequency”...

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USING THE CALLING-FREQUENCY 
MEMORY
The calling-frequency memory location lets you quickly jump to a
specific programmed frequency at any time. The default calling
frequency is 146.52 MHz. You can store a different frequency into
memory as well as other settings associated with that frequency,
such as the repeater offset and CTCSS tone. 
1. Select the desired calling frequency using 
UP/DN or the tun-
ing control.
2. Press 
F+MR (MS). A memory location and ME appear.
3. Rotate the tuning control or...

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SCANNING OPERATION
SCANNING FOR ACTIVE FREQUENCIES
1. To search for activity on a frequency, press SCAN (PRI).
SCAN appears. The transceiver begins to scan up or down
the full frequency range. The transceiver stops on each
active frequency for 5 seconds if squelch is on. If squelch is
off, the transceiver stops on each location for about 1 sec-
ond.
2. To change the scanning direction, press 
UP or DN.
3. To stop on a frequency or to stop scanning completely,
press 
SCAN again.
SCANNING STANDARD...

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CONTINUOUS TONE CODED 
SQUELCH SYSTEM FEATURES
Your transceiver can transmit and receive a low-level, selectable
subaudible tone at the same time as it transmits (TX) or receives
(RX) a regular signal. This special tone lets you listen only to oth-
er transceivers set to the same tone frequency when you use the
transceiver in simplex operation. It also lets you match your trans-
ceiver to the subaudible tone frequency used by a local repeater. 
To enable the TX and RX tones for the transceiver, follow...

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Subaudible Tone Frequencies (Hz)
67.0 107.2 167.9
71.9 110.9 173.8
74.4 114.8 179.9
77.0 118.8 186.2
79.7 123.0 192.8
82.5 127.3 203.5
85.4 131.8 210.7
88.5 136.5 218.1
91.5 141.3 225.7
94.8 146.2 233.6
97.4 151.4 241.8
100.0 156.7 250.3
103.5 162.2 

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USING DTMF TONES
DTMF (Dual-Tone, Multiple Frequency) is another term for touch-
tones
 (the tones a telephone produces when you press a digit).
This standard set of tones is used by many different amateur
transceiver systems for accessing programmable features and
dialing through autopatches to a standard telephone.
Your transceiver produces all 16 standard DTMF tones (0–9,
*, #,
A, B, C, and D). 
Follow these steps to use the DTMF feature.
1. Set 
DTMF on the bottom of the microphone to 
ON.
2....