B.T.S. A.C./D.C. Short-Wave Kit
BTS (B.T.S.) British Television Supplies; London
- Produttore / Marca
- BTS (B.T.S.) British Television Supplies; London
- Anno
- 1935 ?
- Categoria
- Kit, scatola di montaggio (parti sfuse e istruzioni o solo istruzioni di montaggio)
- Radiomuseum.org ID
- 361610
- Numero di tubi
- 4
- Principio generale
- A reazione (con rigenerazione)
- Gamme d'onda
- Onde corte (solamente OC)
- Tensioni di funzionamento
- Alimentazione universale (doppia: CC/CA) / 190 - 250 Volt
- Altoparlante
- - Questo apparecchio richiede altoparlante/i esterno/i.
- Materiali
- Mobile di metallo, valvole visibili
- Radiomuseum.org
- Modello: B.T.S. A.C./D.C. Short-Wave Kit - BTS B.T.S. British Television
- Forma
- Chassis o in scatola da montaggio
- Annotazioni
-
The B.T.S. A.C./D.C. Short-Wave Kit is a three-valve shortwave receiver kit designed for both AC and DC mains operation. It was marketed as a reliable and efficient receiver for enthusiasts, priced at £8 8s (excluding valves, cabinet, and loudspeaker).
Circuit and Valve Lineup
- The receiver uses a well-proven three-valve TRF circuit:
- Variable-mu high-frequency amplifier (Marconi or Osram W30)
- Leaky-grid detector (Marconi-Osram H30)
- Pentode output stage (Marconi-Osram N30)
- For AC mains operation, a Marconi or Osram U30 valve rectifier is included.
- The output pentode (Catkin type) can deliver up to 2.5 watts of undistorted audio.
Tuning and Coils
- The high-frequency amplifier stage is untuned, with a single plug-in tuning coil used for band selection.
- Four plug-in coils are supplied, covering 13 to 260 metres (1.5 - 23 MHz).
- The tuning condenser is 0.00016 μF, fitted with a double slow-motion drive featuring 7:1 and 100:1 gear ratios, which enhances tuning precision.
- The reaction condenser also features a slow-motion drive for fine adjustment.
Panel and Controls
- The panel features a large semi-circular, full-vision scale calibrated from 0 to 180 degrees.
- Main tuning control is centrally located, with a superimposed knob for the slow-motion drive.
- On/off switch is at the bottom centre, with the reaction control to its right.
- Mains voltage is selected via tappings on a Bulgin mains resistance.
Connectivity and Features
- Sockets are provided for the loudspeaker, two aerial connections, and earth.
- A plug and jack are included for pickup (gramophone) use.
Power Supply
- Operates from 190 to 250 volts, AC or DC mains.
Design and Usability
- The kit is noted for its attractive panel layout and practical design.
- Careful attention to tuning and reaction controls allows for efficient and stable shortwave reception.
- The inclusion of slow-motion drives for both tuning and reaction condensers is highlighted as a user-friendly feature.
Intended Audience
The kit is aimed at hobbyists and home constructors seeking reliable shortwave performance with straightforward assembly and operation.
- The receiver uses a well-proven three-valve TRF circuit:
- Prezzo nel primo anno
- 8.20 GB £
- Bibliografia
- -- Original prospect or advert (Practical Wireless Magazine Sep 1935, Page 128.)
- Autore
- Modello inviato da Gary Cowans. Utilizzare "Proponi modifica" per inviare ulteriori dati.
- Altri modelli
-
In questo link sono elencati 14 modelli, di cui 8 con immagini e 0 con schemi.
Elenco delle radio e altri apparecchi della BTS (B.T.S.) British Television Supplies; London