SE-110 / MAX
Autophon AG, Solothurn

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SE-100 / FOX
SE-103 / RTS
SE-104 / P
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SE-110 / MAX
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überarbeitet am 17.12.2010

The portable VHF Wireless Station MAX has been constructed by Autophon in the years of late WWII and has been supplied in a small series of 48 sets in 1945/46. This very innovative but expensive system has been replaced by the VHF sets REX and FIX acquired much cheaper from U.S. surplus.
The VHF station operating im AM mode used a dipole antenna and was powered by a hand cranked generator.

Transceiver, receiver I.F. 25 kHz

58,4 - 68,4 MHz ,

AM (A3, A2)

pout A3 0,1 W



powered by a cranked or foot operated generator
2,35 m dipole antenna
Kurzbeschreibung Kleinfunkstation MAX

The SE-110 / MAX set consists of a transceiver in a metal case in a small canvas bag (3,5 kg), a generator in another canvas bag (another 4,55 kg) and a third canvas bag with the accessories and spares, headphones, morse key, throat microphone and antenna and power cables. With it's 12,35 kg, this station was truly portable, specially compared to the "Tragbar Leicht" shortwave station with 90,7 kg or the VHF "Tragbar Leicht Dezimeter" with 167 kg.

The lid of the metal transceiver case is attached to the canvas bag, the transceiver comes with only four D1F battery tubes.

The station is be powered from a hand cranked or foot operated generator with the LT (5,1 +/- 0,3 V)/ HT (150 +/- 15 V) voltages.
There is a small optical indicator on the generator informing You when the handle is cranked with enough speed.

In the middle of the frontpanel of the transceiver, you find the frequency dial calibrated in MHz and with channel numbers, it can be mechanically locked. The "Empf.-Nachstellung" in the right upper corner let's you adjust the frequency of the receiver section slightly for optimal readability.
The volume control is located in the left upper corner of the frontpanel, below the connectors for headphones, microphone and the morse key, and the power cable connector.
In the right lower part of the frontpanel, You find the transmit - receive switch ("Senden / Empfang") and the mode switch for telegraphy Tg (A2) and telephony Tf (A3). A measuring instrument will indicate the anode voltage when the red button is depressed.
Frontpanel of VHF Wireless station MAX

The accessories are stored in the biggest of the three canvas bags: You find the headphones and throat microphone, the miniature morse key and cables to connect the generator and the transceiver and the latter with the dipole antenna. Of course, You find also a spares box with replacement tubes and a tiny screwdriver.

The generator is integrated in a similar canves bag. A mechanical indicator will tell You the necessary cranking speed is reached, the generator can be operated hand cranked or foot operated, for this purpose, it has to be taken out of the canvas bag and can be fixed on a pair of skis, nowadays with the modern ski equipment, this won't be possible anymore.

The VHF set's range is typical to VHF radiowaves propagation: You can reach on visible points nearer then the horizon, so 100 m - 5 km when there is no line of sight, 8 km in telephony and 15 km in telegraphy from an elevated location and up to 30 km in telephony and 50 km in telegraphy from one mountain peak to another hill or exposed location.

The VHF wireless station MAX has been introduced with the troops in 1945/6 but was replaced by frequency modulated VHF gear from U.S. Army war surplus available much cheaper then this Swiss made high tech offering.

© 17.12.2010 Martin Bösch