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====== Test set T-104 ======
**Test set T-104**; manufactured by [[Autophon|Autophon AG, Solothurn]].

For adjustment and repair work on the [[SE-101]] or [[SE-102]], Autophon developed a test set specifically designed for the set.

{{:images:t-104-autophon.jpg?direct&800|}}

===== Technical data =====
{{ :images:t-104-autophon-closed.jpg?direct&300|}}
  * [[Principle]]: Voltmeter heaters / anode batteries, tube voltmeter / ohmmeter, RF oscillator

==== Power supply ====
  * [[Batteries]]: Heaters battery [[BA37]] 1.5 V; plate battery [[BA38]] 103.5 V (in the T-104 or from the corresponding radio).
  * [[Mains operation]]: via the [[N-100|N-100/103]] power supply unit

==== Dimensions ====
  * 353 x 227 x 210 mm, 7.5 kg

==== Accessories ====
  * Cable set, antenna attenuator

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{{:images:t-104-autophon-front.jpg?direct&600|}}
===== Operation =====
The battery-operated T-104 test set developed by [[Autophon]] is used for maintenance and alignments on the Autophon [[SE-101]] / [[SE-102]] radios. In addition to a RF generator, that can be modulated at 400 Hz, it also includes an attenuator for determining the output power and a tube voltmeter and ohmmeter for measuring the plate and heater voltages, among other things.

The set can be used on channels 23, 45 ([[SE-102]]) and 45, 67 ([[SE-101]]), i.e. on the upper and lower corner frequencies of the two wireless sets.

{{ :images:t-104-autophon-operation.jpg?direct&300|}}
For practical use, the test set is connected to the radio set using two multi-pin cables (the power cable and the control cable); the set to be tested can be set to transmit or receive mode using the "transmit" and "receive" switch on the test set. The pot-shaped artificial antenna is connected to the antenna connector of the set to be tested and connected to the T-104 with the antenna cable; the Rf oscillator can be activated with "Oscillator" and the signal is modulated at 400 Hz with a modulation depth of 15 % with "Modulator" activated.

The measuring instrument can be used to measure DC voltages of 2 V, 20 V and 200 V and AC voltages of 2 V and 20 V; resistance measurements with three ranges are also possible. In the "Int." position of range switch 2, the measuring ranges of range switch 1 are activated. This can be used to measure set-specific plate and heater voltages, plate current and modulation depth.

The functions and test procedure are described in Regl 65.14.

===== Technical principle =====
RF oscillator ([[1T4]]), crystal-controlled, modulation at 400 Hz ([[1T4]]).

==== Tube assembly ====
V1 ([[1T4]], HF oscillator); V2 ([[1T4]], audio generator).

==== Development ====
The T-104 was developed for maintenance & alignment work on the [[SE-101]] and [[SE-102]] radios from [[Autophon]].

==== Use ====

{{gallery>::images?t-104*.jpg&0&80x80&lightbox&showtitle&titlesort}}

===== Technical documentation =====
  * {{ :manuals:se-101-se-102-manual-regl-65-14d.pdf |Die Funkgeräte SE-101 und SE-102, Regl. 65.14d, 1963}}, section on the T-104 from page 39 onwards

==== Further information ====
  * [[http://armyradio.ch/radio-d/t-104.htm|Test device T-104 on www.armyradio.ch]]