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Telefunken (Switzerland) built the portable radio AP 3053.
It was introduced into the Swiss Army as "Kleinfunkgerät SE-103".
The Kleinfunkgerät SE-103(Small radio SE-103)
is a portable HF- radio with AM mode. It is a telephony only radio. The frequency is crystal controlled. It is used to communicate down to group level.
The range can be 3 km by day, and 2 km by night.
One channel can be chosen by changing a channel insert; a spare insert is in the bottom of the radio. By inserting the channel insert, the radio is completely tuned. (The BC-611, for example, when a channel was changed, had to be tuned in the depot).
The channel inserts are nemed by letters. I could not find out, how many inserts were used for the working frequency of 1.6 to 7.5 MHz.
The radio uses an anode battery of 103.5V, and a filament battery of 1.5 V, just like the other Swiss small radio, the SE-100, or FOX. -- or the BC-611.
It can be carried on the sholder, on the back, or in front of the chest. Carries before the chest, it ia sleo called Iron Bra ...
The headset consists of headphones and a throat microphone. When not in use, the headset is stored in a small canvas bag (existing), attached to the radio.
The antenna, when not in use, is stored in a small golf bag. This golf bag is mentioned in the manual. There is no picture of it, and it is not existing in the collection.
Other radios, closely related to the SE-103: