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Magnum 257 Operating Manual

10 meter fm/ssb/am transceiver
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MAGNUM 257
OPERATING MANUAL

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Summary of Contents for Magnum 257

  • Page 1 MAGNUM 257 OPERATING MANUAL...
  • Page 2 Copyright © 1999 by Magnum International. All rights reserved.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Introduction ......................4 Limited Warranty ....................5 Installation ...................... 6 - 7 Front Panel Controls ..................8 - 10 Other Features ....................10 Specifications ..................... 11 Contact Information ................... 12 - 3 -...

  • Page 4: Introduction

    Although engineered with mobile use in mind the 257, with the addition of a high quality 10-amp power supply, may be easily adapted for fixed station operation.

  • Page 5: Limited Warranty

    LIMITED WARRANTY Magnum International warrants this product to be free of defects for a period of one (1) year from the original date of purchase. This warranty is non-transferable. This limited warranty is subject to repair or replacement of defective components only. This warranty is void if the radio has been tampered with or misused.

  • Page 6: Installation

    (RG213, RG58A/U or Mini RG-8 is recom- mended). Attach the mounting bracket to the vehicle first then mount the 257 to the bracket. If the rear panel is not A ground-plane antenna provides greater coverage and accessible you may want to attach the power and an- is recommended for fixed station-to-mobile operation.

  • Page 7: Installation

    If purchasing an alternator noise filter for the Magnum 257 make sure the filter is rated for at least 10 amps continuous current draw. - 7 -...

  • Page 8: Front Panel Controls

    STEP button until the desired digit is flashing. Rotate the FREQUENCY control in either di- 2. MICROPHONE GAIN CONTROL rection. The entire frequency range of the Magnum 257 Increases or decreases the energy developed in the can be stepped through in 10 or 100 kHz increments.
  • Page 9 To activate the programmed offset frequency, press for programming instructions. the FUNC button, and then press the SHIFT button once. +SHIFT is displayed on the LCD. The 257 will 7. MODE \ T. LOW \ 5 now transmit on the frequency that is XXX kHz greater MODE: Operating Mode.

  • Page 10: Other Features

    2. Memory Back Up blue. Press slightly and release, FUNC will be displayed The 257 features a super-capacitor back up for the 5 on the LCD indicating that the function command is memory channels. The 257 can be disconnected from activated.

  • Page 11: Specifications

    GENERAL SPECIFICATIONS Frequency Coverage : Transmit and Receive ........28.000 to 29.699 MHz Antenna Impedance : 50 ohm, unbalanced Frequency Control : Digital Phase-Lock Loop (PLL) Synthesizer Frequency Accuracy : Better than +10 ppm from 0 - 40 C after 15 min. warm up Power Requirement : 12 - 13.8 V DC, negative ground Current Consumption...

  • Page 12: Contact Information

    MAGNUM INTERNATIONAL A Division of RF Limited PO Box 445 • Issaquah WA 98027 Telephone 425-558-9592 • Facsimile 425-558-9704 Technical Support Only 1-877-MAGNUM-9 (1-877-624-6869) http://www.MagnumRadio.com E-Mail info@MagnumRadio.com...