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Oscillator 1281

Oscillator 1281; AVO Ltd.; London (ID = 1496170) Equipment Oscillator 1281; AVO Ltd.; London (ID = 1496171) Equipment
Oscillator 1281; AVO Ltd.; London (ID = 1496173) Equipment
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Oscillator 1281; AVO Ltd.; London (ID = 1496170) Equipment
AVO Ltd.; London: Oscillator 1281 [Equipment] ID = 1496170 706x800
Select picture or schematic to display from thumbnails on the right and click for download.
For model Oscillator 1281, AVO Ltd.; London:
By courtesy of Guest John Denby, Huddersfield, UK.
Country:  Great Britain (UK)
Manufacturer / Brand:  AVO Ltd.; London
Year: 1934 Category: Service- or Lab Equipment
Valves / Tubes 1: HL2
Wave bands Wave Bands given in the notes.
Power type and voltage Storage and/or dry batteries / 120 & 2 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Model: Oscillator 1281 - AVO Ltd.; London
Material Metal case
Shape Tablemodel, with any shape - general.

Battery powered,  AM Signal Generator using a harmonic oscillator.

Wavebands: 100kHz - 1500kHz.

The Triode Oscillator covers the band, 100kHz to 280kHz. For frequencies to 1500kHz harmonics are used.

Modulation on/off switch adds an extra capacitor on the RF oscillator to create audio frequency instability, "squeeging" of around 500Hz.

Low, Medium and High, RF output levels connectors are available.

Batteries: Probably 2V Lead Acid Gel cell (100mA LT consumption) and 120V Dry Cell HT pack with integral grid tap if required (see Ever Ready Winner 120GB and the Portable 56 for example of taps)

Mentioned in Wireless World (The), London (WW, 79) (Nov 2, 1934, Pages 357 & 358.)

Model page created by Michael Watterson. See "Data change" for further contributors.

All listed radios etc. from AVO Ltd.; London
Here you find 67 models, 65 with images and 35 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.