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SyntoniserSyntoniser 300 to 2500 metres This 6 volt battery powered unit could be used either as a continuous wave oscillator for receiver calibration, or as a heterodyne wavemeter for transmitter calibration. Its frequency range is 120kc/s to 1Mc/s (wavelength of 2500 to 300 metres). It was first calibrated in 1921. This unit is Serial No. 1352 Sec/Ref 3D/40 |
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