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SE-109 / K 1 A / artillery radio set
Zellweger AG, Uster

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überarbeitet am 5.9.2010

The K 1 A set constructed by Zellweger, Uster, has been introduced as short distance communications set for the artillery; it is very similar to the K 1 set, but has a different frequency coverage.

Transceiver,

22 - 28 MHz , 20 kHz channel spacing

AM (A3/A2)

pout A3/A2 1 W

Sensitivity

Selectivity
 

2 heaters / LT batteries 6V (9606), 2 anode / HT batteries 60V (9660) or hand cranked generator
different antennas, partly with counterpoise
Reglement Postes Radio d'Artillerie K 1 / K 1A franšais!

The K 1 A set (Artillery set) consists of a transceiver case with a battery compartment (weight 20,5 kg) and a generator / spares case (another 20 kg) with spare tubes.

The transceiver has to be powered from a 6V heaters / LT battery and two 60V anode / HT batteries; alternatively, it can be powered from a hand cranked generator, it's the same model as used in the P-Gerńt.

The operation of the transceiver is uncomplicated: The huge frequency dial pointer also acts as tuning knob, it does directly operate the main tuning capacitor of the transmitter and receiver sections. Press the two pushbuttons at both sides of the dial pointer to move it, it will lock in 20 kHz steps mechanically. A rotary control "Empfangsnachstellung" permits to shift the receiver's operation frequency +/- 80 kHz.
As found in other Zellweger sets, the main switch has it's zero / off position in the middle, turn it to the left for telegraphy mode and to the right for telephony mode, the control also acts as volume control. A ring switch at the microphone / headphones combination activates the transceiver.
Use the antenna tuning control to adjust for a maximum reading on the antenna current instrument when the transmit switch is activated; the meter can also be switched to indicate the heaters (blue/yellow) and anode / B+ voltages (red/black), too.

The accessories can be stored in a compartment just below the transceiver chassis: the LT and the two HT batteries, the headphones, the hand mike and the throat microphone.

The set's operation range is 5 km in telephony and 10 km in telegraphy mode under standard conditions and up to 20 or 40 km from a optimum location on top of a hill.

Many of the sets have been destroyed when the Swiss Army faded them out, nearly all K 1 A transceivers were sent to the bottom of a small lake in the Swiss alps.

© 5/2009 Martin Bösch