50 Watt Broadcast Transmitter KVFH 50/2C

The new type KVFH 50/ 2C transmitter for 4IP Ipswich, Queensland, manufactured by Colville Wireless Equipment Co., Sydney under license and in collaboration with Philips Lamps (A/sia) Ltd.

Transmits on 208 metres (1440 kHz) with a carrier power 0f 50 watts.

Marked on the photo are;

(1) is the modulator and sub-modulator panel carrying the input from the mixer panel which drives the sub modulator which in turn drives the 200 W modulator valve. The cathode ray screen may be seen at the top of the panel. This provides a visual indication of fidelity and percentage modulation.

(2) Is the R.F. panel in which are incorporated the Crystal Oscillator (with thermostatically controlled dual crystals); Separator stage; 1st R.F. amplifier and output R.F. amplifier.

(3) contains all transformers, rectifiers and filters supplying voltages to the various stages from 150 to 2,000 volts. Each circuit is protected with " delay," sequence" and " over- load" relays, the  operation of which is indicated by the signalling 'lamps in the centre of the panel.

(4) shows a back view of the R.F. panel which also carries the crystal oven (not shown).

The studio equipment comprises velocity, condenser and Reiss microphones; 2 speed phonograph turntables; crystal pickups; mixer panel, etc.

Vous pourrez trouver sous ce lien 18 modèles d'appareils, 16 avec des images et 0 avec des schémas.
Tous les appareils de Colmovox (Brand), Colville-Moore Wireless Supplies Ltd.; Sydney NSW