Midland 248 User Manual

ENGLISH
7
TECHNICAL SPECIFICATIONS
GENERAL
Channels ...................................................................... (see the frequency band chart)
Frequency Range ......................................................................26.565 - 27.99125 MHz
Duty cycle (% on 1 hour) .............................................. TX 5% - RX 5% - Stand-by 90%
Frequency Control .....................................................................................................PLL
Operating Temperature Range ......................................................................-10°/+55° C
DC input voltage .....................................................................................12.6VDC ±10%
Size.......................................................................................180 (L)x50 (H)x150 (P) mm
Weight ........................................................................................................................ 1kg
RECEIVER
Receiving system ....................................................... dual conversion superheterodyne
Intermediate frequency ............................................ I°IF:10.695MHz•II°IF:455KHz
Sensitivity ............................................................... 0.5µV for 20 dB SINAD in FM mode
................................................................................ 0.5µV for 20 dB SINAD in AM mode
Audio output power @10% THD ............................................................2.0 W @ 8 Ohm
Audio distortion ............................................................................ less than 8% @ 1 KHz
Image rejection ....................................................................................................... 65 dB
Adjacent channel rejection ..................................................................................... 65 dB
Signal/Noise ratio ................................................................................................... 45 dB
Current drain at stand/by .......................................................................................250mA
TRANSMITTER
Output power .......................................................................................................4W max
Modulation .....................................................................................AM: from 85% to 95%
......................................................................................................FM:1,8 KHz ± 0,2 KHz
Frequency response ...................................................................................300 Hz/3 KHz
Output impedance ..................................................................... RF 50 Ohm unbalanced
Signal/Noise Ratio ...........................................................................................40 dB MIN
Current drain ..............................................................................................max 2500 mA
Specifications are subject to change without notice.
A readily accessible disconnect device shall be incorporated in the installation wiring.
The disconnect device shall disconnect both poles simultaneously.

Midland 248 Specifications

Operating Environment

frequency range	26.565 - 27.99125 MHz
duty cycle	TX 5% - RX 5% - Stand-by 90%
operating temperature range	-10°/+55° C

Power

dc input voltage	12.6VDC ±10%
current drain at stand-by	250mA
current drain max	2500 mA

Receiver

sensitivity fm mode	0.5µV for 20 dB SINAD
audio output power	2.0 W @ 8 Ohm
audio distortion	less than 8% @ 1 KHz

Transmitter

output power	4W max
modulation am	from 85% to 95%
modulation fm	1, 8 KHz ± 0, 2 KHz

Weight and Dimensions

size	180 (L)x50 (H)x150 (P) mm
weight	1kg