Radio Shack HTX-420 User Manual

BG TECH.
VERSION III
2001/2/28
Scanning Operation
Scanning for Active Frequencies
Continues Tone Coded Squelch System Features
Using the CTCSS tones
Using DTMF Code
Transmitting a DTMF code from Memory
Transmitting a DTMF Code Using Direct Entry
Other Special Features
Locking the Keypad
Lighting the Display
Turning the Display and Keypad
Turning the Key Tone On and Off
Setting the Frequency Step
Power Save
Using Auto Power Off
Time-Out-Timer
Turing the Weather Radio Frequencies
Weather SAME Alert
Electronic Compass
TX Power Output Setting
Busy Channel Lock Out
Resetting
XBO Channel Operation
Dual Watch
Receiving Air band
Expanding TX Frequency range by Key pad Programming

Radio Shack HTX-420 Specifications

Frequency

2-Meter TX frequency range	144–148 MHz
2-Meter RX frequency range	137–174 MHz
70-cm TX frequency range	438–450 MHz
70-cm RX frequency range	420–512 MHz
Air Band frequency range	108.000-136.9875 MHz
Weather Band channels	CH1–CH7

Operating Environment

frequency stability	± 10 ppm
operating temperature range	14° to 140° F (–10° to 60° C)
operating voltage range	DC 5 V to 13.8 V

Receiver

circuit type	Dual Conversion, Superheterodyne
1st IF frequency	45 MHz
2nd IF frequency	450 kHz
sensitivity	0.2 µV For 12dB Sinad
distortion	5% Max
S/N ratio	34 dB Min.

Transmitter

power output at DC 7.2 V	3 W
power output at DC 13.8 V	4 W
distortion (nominal)	3%
deviation	± 5 kHz Max.
S/N ratio	32 dB
current drain at DC 7.2 V	1200 mA
current drain at DC 13.8 V	1500 mA

Weight and Dimensions

weight with rechargeable battery	11.46 oz (325g)
dimensions (HWD)	4[1]/2 × 2[2]/5 × 1[1]/5 (122 × 61 × 31 mm)
impedance	50 ohm