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====== SE-112: M5-Gerät ======
**Kleinfunkgerät SE-112** / **M5 Set**; developed and produced by [[Zellweger|Zellweger AG, Uster]].

A device very similar to the infantry patrol radio [[SE-105|P5]] was installed for mobile operation on vehicles of the military police. It was called **M5** oder **SE-112** and was powered from a rotary converter.

{{:images:se-112-m5-open.jpg?direct&600|SE-112: M5-Gerät}}
===== Technical Data =====
  * [[Principle]]: [[Transceiver]]; Receiver: [[Single conversion superhet]]: [[IF]] 470 kHz
  * [[Modes]]: [[A2|Telegraphy modulated (A2)]], [[A3|Telephony AM (A3)]]
  * [[Frequency range]]: 18 - 24 MHz
  * [[Sensitivity]]: [[A3|AM (A3)]]  / [[Selectivity]]: 
  * [[Output power]]: 5 (1) W

==== Power Supply ====
  * [[Accumulator / Batteries]]: combined battery for heaters and plate voltages [[Leclanché]] 1266, 126 / 6 Volt
  * [[Generator]]: [[G-105|Hand cranked generator GM5]]
  * Vehicle use: [[UM-5|Rotary converter UM5]], powered from 12 V vehicle battery

==== Dimensions ====
  *  340 x 470 x 220 mm, 15.4 kg without battery, converter UM5 5.8 kg, hand cranked generator GM5 15.4 kg; long distance antenna material in canvas bag 4.4 kg.

==== Accessories ====
  * In vehicle use, the standard antenna is a 2.4 - 3 m whip antenna.
  * For mobile use, a rad antenna from ten antenna elements and a terminal capacitor (length 3,4 m) can be used.

----
{{:images:se-112-m5-front.jpg?direct&500|SE-112: M5-Gerät}}\\ 
The M5 set consists of the transceiver case with a battery compartment (weight 15,4 kg without batteries), a generator case (another 15,4 kg) with the hand cranked generator and spares, the rotary converter UM5 and a canvas bag (5,7 kg) with the 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, the hand cranked generator or the vehicle converter; for transmitting, no battery operation is possible, the hand cranked generator or the on-board rotary converter has to be used. A relay prevents the transmitter section to be be powered from the battery which might be exhausted very soon.

The set switches automatically from receive to transmit mode when the push-to-talk button is pressed or when the morse key is operated, one second after transmitting the last morse code letter, the SE-112 returns to receive operation.

{{ :images:se-112-m5-frontpanel.jpg?direct&400|Frontpanel SE-112}} The operation of the transceiver is easier then to supply it with the necessary voltages:\\ 
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 round thumbwheel lets You detune the set for +/- 50 kHz, to move the dial pointer to another position, set the interpolation tuning knob to zero again. A rotary control "Empfangsnachstellung" permits to shift the receiver's operation frequency +/- 50 - 100 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.\\ 
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 be switched to indicate the heaters and anode / B+ voltages, too.

The accessory compartment underneath the transceiver accommodates the combined heater and plate battery, the headphones, the morse key and the microphone. A switch on the microphone can be used to switch off the transmitter tubes for battery saving in receive mode. In the "On" position, the transmitter tubes are constantly heated; for longer transmission pauses, they are switched "Off"; when the push-to-talk button is pressed, it will then take 4 seconds until the transmitter tubes are heated up and the message can be transmitted.

{{ :images:se-112-um5.jpg?direct&300|SE-112: Umformer UM5}} The **Converter UM5** comes with a sheet metal housing and is powered by the vehicle on-board voltage of 12 V, it provides the plate voltage of 180 V and the heaters voltage of 4.2 V.

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.

===== Technical Principle =====
{{:images:se-105-p5-geraet-chassis.jpg?direct&400|}}\\ 
In the transceiver chassis, the transmitter is placed on the right and the receiver unit on the left side.\\ 

In the transmitter, there is an oscillator ([[de:PD120]]), a frequency doubler stage ([[de:PD120]]) and two RF output valves ([[de:PP226M]]). The set has plate modulation, the two modulator valves ([[de:PP226M]]) supply enough output to modulate the plate voltage. Valve V6 ([[de:PD120]]) acts as microphone amplifier, valve V7 as audio frequency oscillator for the modulation in [[A2]] mode.

The receiver is a [[single conversion superhet]] with double use of the three double pentodes V5 - V7.\\ 
The signal coming from the antenna is mixed in valve V5 ([[de:PD120]]) to generate the [[intermediate frequency]] of 465 kHz, the second pentode system acts as oscillator. One system of each valve V6 ([[de:PD120]]) and V7 ([[de:PD120]]) acts as a double stage AF amplifier. The second system of valve V7 acts as audion (regenerative demodulator), the second system of V6 as AF amplifier, the set only gives headphone output.

==== Valve layout ====
In the transceiver, only two kinds of valves are used: The quite "exotic" double pentodes [[de:PD120]] and power pentodes [[de:PP226M]]. These two kinds of valves made by Tungsram in Hungary could be acquired even during war time to produce a sufficient number of sets:

V1 ([[de:PD120]], transmitter oscillator); V2 ([[de:PD120]], frequency doubler); V3 ([[de:PP226M]], RF output stage); V4 ([[de:PP226M]], RF output stage); V5 ([[de:PD120]], TX: rectifier for the measurement of plate current; REC: oscillator / mixer); V6 ([[de:PD120]], TX: microphone amplifier; REC: 1. IF amplifier, AF amplifier); V7 ([[de:PD120]], TX: audio frequency generator for [[A2]]; REC: 2. IF stage, audion); V8 ([[de:PP226M]], modulator); V9 ([[de:PP226M]], modulator).

==== Development ====
In 1942 Zellweger, developed the low power wireless station M5 as a variant of the [[SE-105|Patrol radio station P5]] to equip the vehicles of the battalions of the motorized military police, in total 26 units were supplied. In 1963, the sets were liquidated.

==== Field Use ====
{{gallery>:images?se-112*.jpg&0&80x80&lightbox&showtitle&titlesort}}

===== Technical Documents =====
  * {{ :manuals:se-112-zellweger-kleinfunkgeraet-m5.pdf |Kleinfunkgerät "Uster M5", Zellweger AG}}

==== Additional Information ====
  * [[https://www.hamfu.ch/de/geraete/geraet.php?id=180|SE-112 / M5 auf der Website der Hamfu]]