• Country
• Denmark

• Manufacturer / Brand
• Radiometer; København - Copenhagen

• Year
• 1962 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 162752

• Number of Tubes
• 6

• Valves / Tubes
• ECH81 ECH81 ECH81 ECF80 EM84 EL84 150B2

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 110; 115; 127; 200; 220; 240 Volt

• Material
• Metal case

• from Radiomuseum.org
• Model: Beat-Frequency Oscillator HO32 [c, e] - Radiometer; København -

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 392 x 265 x 205 mm / 15.4 x 10.4 x 8.1 inch

• Notes
• The HO32 beat-frequency oscillator is an audio-frequency generator for the frequency range ~0...21 kHz. It uses a main VFO 200-179,5 kHz, left dial 0-20.500 kc, and an auxiliary VFO, right dial 0-500 cycles (Hz). The sum of both dial-readings gives the output-frequency. These oscillators can be are zero-beated when both dials are set to zero. The zero adjuster can correct the main VFO with about plus or minus 70 cycles. Because very low frequencies cannot be heard, zero beating is checked with the magic-eye; when the dark centre in the middle of the eye stands still, zero beat is achieved. The buffered ECH81-oscillators are mixed in a third ECH81. The output of the mixer goes through a 60 kHz low-pass filter and is fed to the 0-10 output-potentiometer. This potmeter gives 0-1 volts input to the audio-amplifier. Here is also a signal-input banana-jack for an external audio signal up to 1 volts, impedance 50 k. If a banana plug is inserted halfway into this jack, the external signal is combined with the internal signal, but if the banana plug is fully inserted, the ECH81 tubes are cut off from the anode-supply. When both signals are handled, the frequency of the external audio-signal can be determined. The ECF80-triode serves as a driver for the EM84, and the ECF80-pentode is the output-preamplifier to feed the EL84, with heavy negative feedback. The output of this power-penthode is either R-C coupled to a resistive output-attenuator to 3 mV - 100 V, or to L-C output 2 kohm / 5 kohm, or to transformer-output 5 / 25 / 500 ohm, all into banana-jacks.
  The HO32 code is followed by a version-letter e.g. HO32c or HO32e.

• Net weight (2.2 lb = 1 kg)
• 10.250 kg / 22 lb 9.2 oz (22.577 lb)

• Source of data
• -- Other type before this -same/similar characteristics - see exchange.

• Literature/Schematics (4)
• OZ5PZ Paul Rosenbeck's copy of the manual

• Author
• Model page created by Sándor Selyem-Tóth. See "Data change" for further contributors.

• Other Models

• Here you find 40 models, 37 with images and 14 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radiometer; København - Copenhagen