Radio Shack HTX-420 User Manual

BG TECH.
VERSION III
2001/2/28
Power Save – conserves battery power when the transceiver is not transmitting or receiving.
Programmable Frequency Steps – let you set the frequency increment for tuning or scanning to steps of 5,
6.25, 7.5, 10, 12.5, 15, 20, 25, 25, 50kHz.
Signal Strength Indicator – a graduated bar shows the relative strength of the received signal.
Time-Out Timer – lets you set a maximum transmission time interval among 1,2,3,4,5,10,15,20 minute.
Earphone Jack and External Microphone Jack – let you connect an optional earphone, external
microphone, or combination headset for more flexible operation.
External Power Jack – lets you use an external power source for maximum output.
Back Light – makes your transceiver easy to operate in low-light situations.
Weather SAME Alert – lets you watch specific area message from NOAA and listen to the weather
broadcast.
Auto Power Off – lets your transceiver automatically turn off after a preset period of non-use.
Electronic Compass – lets you know the directions.
Cross Band Operation – lets you use the different frequency for transmitting and receiving.
Dual Watch – let you watch two different channels.
Air band receiver – lets you listen to air band broadcast.

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