• Paese
• Gran Bretagna (Regno Unito)

• Produttore / Marca
• Homebrew - ORIGINAL; GB

• Anno
• 1964

• Categoria
• Modulo per radio post 1925 (non un particolare, nessun tasto)

• Radiomuseum.org ID
• 304503

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Numero di transistor
• 2

• Semiconduttori

• Gamme d'onda
• Onde corte (solamente OC)

• Tensioni di funzionamento
• Varie, dettagli nelle note o non conosciuti / 6, 28 and 180 Volt

• Altoparlante
• - - Nessuna uscita audio.

• Materiali
• Mobile di metallo

• Radiomuseum.org
• Modello: 30 MHz Riometer calibrator - Homebrew - ORIGINAL; GB

• Forma
• Soprammobile a cassapanca o cassetta, solitamente con coperchio (NON a leggio)

• Dimensioni (LxAxP)
• 93 x 120 x 120 mm / 3.7 x 4.7 x 4.7 inch

• Annotazioni

• Calibrator for 30 MHz Riometer. (Relative Ionospheric Opacity Meter)
  Home built in the UK by GM3NZI in 1964.

  The calibrator comprises a Zener diode noise generator, a coaxial antenna switch and a motorised attenuator. It is designed to calibrate the sensitivity of a receiver that records the intensity of galactic noise at around 30 MHz. At regular intervals the calibrator receives control signals from a clock that cause it to switch the receiver input from its antenna to the noise generator. The attenuator then steps successively through levels of +10 dB, +5 dB, 0 dB, -5 dB and -10 dB relative to the nominal galactic noise level. The coaxial switch then reconnects the receiver to its antenna to continue recording the galactic noise level.

  Since the antenna is directed at the north celestial pole, it continues to receive radiation from the same area as the earth rotates on its axis. Hence the observed variations in received signal strength indicate the relative opacity of the ionosphere.

  The Zener diode was selected for its stable long-term noise output and low temperature coefficient, and the noise generator is in a plug-in module that allows it to be checked against an absolute standard at intervals. There is provision to measure and adjust the diode current, and to rotate the attenuator manually for test purposes.

  Input and output impedance 75 ohms.

  DC power supplies:
  180v regulated.
  28v for Ledex solenoid.
  6v for Londex relay.

  Built in three Eddystone die cast boxes.

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

• Autore
• Modello inviato da Bruce Taylor. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 41 modelli, di cui 19 con immagini e 7 con schemi.
  Elenco delle radio e altri apparecchi della Homebrew - ORIGINAL; GB