• País
• Gran Bretaña (GB)

• Fabricante / Marca
• Homebrew - ORIGINAL; GB

• Año
• 1964

• Categoría
• Aparato de medida y servicio (Equipo de laboratorio).

• Radiomuseum.org ID
• 304501

Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

• Numero de valvulas
• 1

• Válvulas
• A2087 85A2

• Numero de transistores
• 2

• Semiconductores

• Gama de ondas
• Onda Corta solamente

• Tensión de funcionamiento
• Alimentado desde otro equipo o aparato principal. / 6 & 180 Volt

• Altavoz
• - - No hay salida de sonido.

• Material
• Metálico con lámparas a la vista.

• de Radiomuseum.org
• Modelo: High level RF noise generator - Homebrew - ORIGINAL; GB

• Forma
• Portátil de bolsillo , menor de 20cm.

• Ancho, altura, profundidad
• 93 x 120 x 120 mm / 3.7 x 4.7 x 4.7 inch

• Anotaciones

• Home built by GM3NZI in 1964.

  A thermionic noise generator diode operating with saturated anode current provides a known absolute RF noise level over a broad band of frequencies. However, with a 50 or 75 ohm load the valve life at the anode currents required for high output noise levels results in short valve life. (e.g., only 100 hours at 20 mA for the A2087).

  This noise generator was designed to supply a constant high noise output level to a low impedance load for long-term stability measurements of a special receiver, but only over a limited frequency band around 30 MHz. It employs a tuned impedance transformer to allow the diode to deliver a high noise level to the load, while operating at a current (typically 4 mA) that permits a valve life of over 1000 hours. Because of the impedance transformer the output level is not absolute, so the device isn't suitable for receiver noise factor measurements (which don't require a high noise level anyway).

  The nominal 6v filament supply should be in the range 5.7 - 7.0v, floating wrt earth. The 180v supply may be negative earthed. A jack socket is provided to allow a chart recorder to be used to monitor the saturated anode current, which is stabilised by the Darlington pair in the filament circuit.

  Built in an Eddystone die cast box.

• Peso neto
• 0.7 kg / 1 lb 8.7 oz (1.542 lb)

• Autor
• Modelo creado por Bruce Taylor. Ver en "Modificar Ficha" los participantes posteriores.

• Otros modelos

• Donde encontrará 41 modelos, 19 con imágenes y 7 con esquemas.
  Ir al listado general de Homebrew - ORIGINAL; GB