250 kW Short-Wave Broadcast Transmitter SK 53 C3-2
BBC - Brown Boveri; Switzerland
- Pays
- Suisse
- Fabricant / Marque
- BBC - Brown Boveri; Switzerland
- Année
- 1981 ??
- Catégorie
- Émetteur commercial (pas d'émetteur/récepteur)
- Radiomuseum.org ID
- 329045
- No. de tubes
- 4
- No. de transistors
- Semi-conducteurs présents
- Semi-conducteurs
- Principe général
- Émetteur
- Gammes d'ondes
- OC uniquement
- Tension / type courant
- Alimentation Courant Alternatif (CA) / 3-24 k Volt
- Matière
- Boitier métallique
- De Radiomuseum.org
- Modèle: 250 kW Short-Wave Broadcast Transmitter SK 53 C3-2 - BBC - Brown Boveri;
- Forme
- Rack
- Remarques
-
The 250 kW Short-Wave Broadcast Transmitter, Type SK 53 C3-2 is fully automatic tuning equipped with a class “B” Modulator.
Main features:
- transistorized preliminary RF and AF stages
- Class B modulation
- Only four tubes
- all rectifiers with solid state elements
- automatic tuning
- unlimited choice of frequency in automatic tuning mode in broadcast bands; on special request outside bands
- frequency change time maximum 60 seconds for automatic version
- sinusoidal and trapezoidal modulation
- possibility of high-power SSB service using PSM
- easy provision of DCC
- protective and automatic sequence circuits ensure safety of the equipment
- personnel security system fulfills IEC 215-1
- very simple layout of RF circuits ensures easy accessibility to components through doors at front and rear
- very high overall efficiency
Abridged Specifications Carrier power output 250 kW over full frequency range Frequency range 5.95-21.85 MHz Output impedance 50 Ω unbalanced/300 Ω balanced (with balun) Permissible standing-wave ratio (SWR) 1:2.0 at 50 ohm output/1:1.7 at 300 ohm output Carrier noise level below m = 100% f = 1000 Hz unweighted: -55 dB Carrier shift with sudden application or removal of 100% modulation the variation in the carrier voltage will not exceed 5% AF input level for m = 100% modulation across 600 Ω balanced input impedance: 0 dBm - 20 dBm. Recommended 18 dBm Required time for frequency change 60 s maximum
- Littérature
- - - Manufacturers Literature
- Auteur
- Modèle crée par Gary Cowans. Voir les propositions de modification pour les contributeurs supplémentaires.
- D'autres Modèles
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Vous pourrez trouver sous ce lien 20 modèles d'appareils, 20 avec des images et 2 avec des schémas.
Tous les appareils de BBC - Brown Boveri; Switzerland