1 - ericssonhistory.com

Fig. 12
Example of connection of main cable to
repeater housing
H- -w- '""•...••HLLL—J
All apparatus in the signal path is combined into plug-in, hermetically
sealed units, one per system and direction of transmission, connected to the
repeater housing terminal panel. The combination of all high frequency
equipment into a single unit results in maximum precision of the gain curve.
The principle also has the advantage of requiring a minimum of terminals in
the housing.
Fig. 13 shows such a line amplifier unit for 1.3 Mc/s bandwidth.
The 4 Mc/s line amplifier has exactly the same mechanical design. The
repeater housing is constructed so as to be usable for the 4 Mc/s system
without modification.
On conversion from a 1.3 Mc/s to 4 Mc/s system, new housings are so
located that the repeater spacing is halved and the 1.3 Mc/s repeaters are
replaced by 4 Mc/s repeaters.
The housing accommodates up to 4 systems, i.e. 8 amplifier cylinders.
^*=r,
Fig. 13
Line amplifier for 1.3 Mc/s system
"1
* 4 ^
(Below) with cover removed
88