• Pays
• Royaume Uni

• Fabricant / Marque
• MILITARY U.K. (different makers for same model)

• Année
• 1941–1944 ?

• Catégorie
• Émetteur militaire

• Radiomuseum.org ID
• 271818

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

• No. de tubes
• 9

• Lampes / Tubes
• AW3 AW3 ATS25 ATS25 ATP35 ATS25 ARP34 AU1 EA50

• Principe général
• Émetteur

• Gammes d'ondes
• Bandes en notes

• Tension / type courant
• Secteur (type non connu) / 100-250 Volt

• Haut-parleur
• - Pour casque ou amplificateur BF

• Matière
• Boitier métallique

• De Radiomuseum.org
• Modèle: Wireless Set No.12 Sender - MILITARY U.K. different makers

• Forme
• Gros appareil industriel ou militaire (> 20 kg)

• Dimensions (LHP)
• 24 x 12.5 x 17.5 inch / 610 x 318 x 445 mm

• Remarques

• An HF transmitter used by the British Army in larger vehicles from 1940 onwards, with the accompanying R107 HF receiver. It produces about 25W in CW mode, and 7W in AM/RT mode. There are two models of the equipment: the Mk.I runs on line frequencies of 45 - 65c/s, and the Mk.II on line frequencies of 45 to 500c/s. Line voltages are 100 - 250V for both models.

  The frequency range is 1.2Mc/s to 17.5Mc/s in four overlapping bands. As well as CW and R/T (AM) modes, it includes a MCW mode to send Morse to receivers with no BFO.

  The main stages are (1) an oscillator, which can be crystal controlled or variable frequency running at half the output frequency, (2) a separately tuned multiplier/buffer amplifier, (3) a Class C power amplifier with a parallel tuned circuit output using a variable tapped inductor to match aerial impedances of 100 - 600 ohms, (4) a microphone pre-amplifier and 900c/s audio oscillator in MCW mode, (5) a modulator stage which is transformer coupled to suppressor grid of the PA valve, and (6) a rectifier to produce sidetone directly from the modulated RF output.

  This is one of the first British transmitters to improve on the older MOPA configuration by introducing an intermediate buffer stage, which is not there to increase the drive to the PA, but rather to isolate the VFO from the pulling effects of tuning the PA.  This feature, along with a stabilised HT supply to the VFO helped limit drift to a maximum of 3kc/s at 10Mc/s output frequency (300ppm).

  Accompanying equipment includes the R107 receiver, Aerial Coupling Units Type F and Type H, and Remote Control Unit Type C.

• Poids net
• 134 lb (134 lb 0 oz) / 60.836 kg

• Littérature
• Wireless for the Warrior; L.Meulstee (Volume 1, Chapter WS12)

• Schémathèque (1)
• -- Original-techn. papers. (EMER Tels D142 and D144, Jan and Feb 1945)

• Schémathèque (2)
• -- Original-techn. papers. (Wireless Set No.12 Mk.II General Description, Working Instructions, Aerials and Maintenance.)

• Auteur
• Modèle crée par Richard Hankins. Voir les propositions de modification pour les contributeurs supplémentaires.

• D'autres Modèles

• Vous pourrez trouver sous ce lien 152 modèles d'appareils, 120 avec des images et 48 avec des schémas.
  Tous les appareils de MILITARY U.K. (different makers for same model)