250 kW Short-Wave Broadcast Transmitter SK 53 F3-2
BBC - Brown Boveri; Switzerland
- País
- Suiza
- Fabricante / Marca
- BBC - Brown Boveri; Switzerland
- Año
- 1981 ??
- Categoría
- Transmisor comercial (TX no transceptor)
- Radiomuseum.org ID
- 329089
- Numero de valvulas
- 4
- Numero de transistores
- Hay semiconductores.
- Semiconductores
- Principio principal
- Transmitter
- Gama de ondas
- Onda Corta solamente
- Tensión de funcionamiento
- Red: Corriente alterna (CA, Inglés = AC) / 3-24 k Volt
- Material
- Metálico
- de Radiomuseum.org
- Modelo: 250 kW Short-Wave Broadcast Transmitter SK 53 F3-2 - BBC - Brown Boveri;
- Forma
- Rack
- Anotaciones
-
The 250 kW Short-Wave Broadcast Transmitter, Type SK 53 F3-2 with motorised manual tuning and equipped with a class “B” Modulator.
Main features:
- transistorized preliminary RF and AF stages
- Class B modulation
- Only four tubes (with Class B)
- 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 3 min approx.
- Mencionado en
- - - Manufacturers Literature
- Autor
- Modelo creado por Gary Cowans. Ver en "Modificar Ficha" los participantes posteriores.
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