SE-105 / P 5 set / patrol radio set
überarbeitet am 5.9.2010
The P 5 set constructed by Zellweger, Uster, is the high power variant of the
"P Geraet", the patrol radio set.
The P 5 set (Infantry Patrol set) consists of a transceiver case with a battery compartment (weight 15,4 kg, with the battery 19 kg), a generator case (another 15,4 kg) with the hand cranked generator and spares and a canvas bag (5,7 kg) with material for a long distance antenna.
In the transceiver case, the transmitter section is located at the right and the
receiver section at the left side.
The receiver can be powered from a combined LT (1,5V)/ HT (126V) battery or a
hand cranked generator; for transmitting, the hand cranked generator must be used
under all circumstances, a relay prevents the transmitter section to be be powered
from the battery which might be exhausted very soon.
The operation of the transceiver is easier then to supply it with the necessary voltages:
The accessories can be stored in a compartment just below the transceiver chassis:
the combined LT / HT battery, the headphones, the hand and the throat microphone and the morse key.
The generator is integrated in a case very similar to the transceiver case: a voltmeter indicates, when the necessary voltages for operation are okay or if You have to crank with higher speed to generate the heaters / LT voltage of 5,7 V ond the anode / HT voltage of 120 Volts. A rotary switch allows You to reduce anode / B+ voltage from 180 to 90 Volts, the transmitter output power will be reduced to 1 W and You will find turning the crank of the generator a bit easier.
The set's operation range is 3 km in telephony and 5 km in telegraphy mode in not very suited a housing area and up to 180 or 200 km from a optimum location on top of a hill.
A typical "Wireless Radio Patrol" consisted of four men: a corporal (sergeant) acting as group commander, a radio operator, a writer and one person operating the generator. These radio patrols had to march on foot or could ride bicycles.
© 5/2008 Martin Bösch