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Barlow Wadley Xcr30 Portable Hf Radio Operating Instructions

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    Page 1 RECEIVER XCR 30, RECEIVER OPERATING INSTRUCTIONS General Description: The XCR-30 is a specialised, high sensitivity portable shortwave receiver, designed to provide precision frequency tuning over the full shortwave spectrum up to 30 MHz, with exceptional frequency stability to both amplitude modulated (AM) and single sideband (SSB) transmissions. The Circuit: A multiple heterodyne circuit is incorporated wherein the harmonics of a 1 MHz quartz crystal control the frequency shown on the...
    Page 2 THE ANTENNA TUNE CONTROL To provide maximum sensitivity from the whip aerial it is desirable to tune the antenna separately by means of the control provided. The complete coverage from S00 kHz to 30 MHz is provided by one rotation of this control. It occurs in three segments as marked nominally on this control (.5 to 2MHz; 2 to 6 MHz and 6 to 30 MHz). These are consecutive but may be regarded as continuous if desired. When searching for a weak station it is necessary that this control be set...
    Page 3 An external phone socket is provided on the left hand side. The external phones or speaker should be not less than 8 ohms impedance. The jack disconnects the internal speaker automatically. An external power socket is provided alongside the phone socket. The receiver has an internal voltage regulator and thus a D.C. voltage supply from about 7 to a maximum of 14 volts can be applied. The voltage is regulated to 6.5 volts and at or below this voltage regulation ceases. The receiver will however...
    Page 4 4. In practice the MHz dial should be set roughly to indicate the MHz portion of the frequency required. Subsequently it may be adjusted slightly in order to strengthen the reception. It may also be adjusted to eliminate certain types of interference due to image channel effects. This displacement shifts the images until they cannot be heard, without affecting the main tuning. This is an advantage of a multiple heterodyne design over a conventional heterodyne design where such an image effect...
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