Radio Shack HTX-420 User Manual

BG TECH.
VERSION III
2001/2/28
FEATURES
Your RadioShack Compact Handheld 2m/70cm FM Amateur Transceiver is compact and rugged, making it
easy to carry almost anywhere. The crystal controlled circuitry provides accurate and stable frequency
selection, making it an ideal choice for your amateur communications needs.
Note : You must have a Technician Class or higher Amateur Radio Operator’s License, and a call sign
issued by the FCC, to legally transmit using this transceiver. Transmitting without a license carries heavy
penalties. Getting a license is easier than ever. See “Introduction to Amateur Radio” on Page for more
information.
Here are some of your transceiver’s features.
Delux-Featured Dual-Band Radio – means flexible transmitting options with the latest built-in
conveniences. Its compact size and light weight are perfect for an amateur radio operation on the go.
Full 16-Key DTMF (Dual-Tone Multi Frequency) Keypad – lets you dial and make telephone connections.
Up To 5 Watts Output – The transceiver transmits at 5 output when powered by 13.8V External power
supply.
100 Memory Locations – let you store up to 100 frequencies and other settings.
S/RF and Battery Strength Meters – assure accurate signal and battery strength readings.
CTCSS (Continuous Tone Coded Squelch System) Subaudible Tone – both encodes and decodes 50
subaudible tones to help reduce interference from other nearby systems operating on the same frequency.
Repeater Offset – lets you select the offset value to match a local repeater.
Scan – the transceiver scans its full frequency range and 100 memory locations for transmissions.

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