Table of Contents
Advertisement
Frequency Tables
A mobile telephone for the ETACS system operates in full duplex and provides
1320 channels with a channel spacing of 25kHz (0.025MHz) and a duplex separa-
tion of 45MHz.
The 900MHz band has been divided into an upper and a lowerband. The lower sub-
band, 872.0125 - 904.9875MHz, covers the 1320 transmitting channels in the hand-
held telephone, while the upper sub-band, 917.0125 - 949.9875MHz, covers the
corresponding 1320 receiving channels.
The channels are numbered from 1329 to 2047 and from 0 to 600.
The following formulas can be used to calculate the frequencies (f,MHz) associated
with a certain channel number (N = channel number).
Frequencies, channels 1329 - 2047 (see table 1):
f
Tx
f
Rx
Frequencies, channels 0 - 600 (see table 2):
f
Tx
f
Rx
= 872.0125 + (N-1329) x 0.025 MHz
= 917.0125 + (N-1329) x 0.025 MHz
= 889.9875 + N x 0.025 MHz
= 934.9875 + N x 0.025 MHz
System Introduction
11
Advertisement
Chapters
Table of Contents
