Magnum 257 operating manual.
Copyright © 1999 by magnum international. All rights reserved..
Table of contents introduction ......................................................................................................... 4 limited warranty ................................................................................................. 5 installation ..................................
Introduction congratulations on your purchase of a magnum 257 10 meter fm/ssb/am transceiver. The 257 is designed to provide years of enjoyment and trouble-free service. There are many features and functions designed into this transceiver. To ensure that your investment is enjoyed to its fullest ext...
- 5 - 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...
- 6 - installation 1. Contents unpack and inspect your magnum 257 for missing or damaged components. Your 257 includes the follow- ing items: quantity description 1 magnum 257 transceiver 1 microphone with up/down controls 1 mounting bracket with hardware 1 microphone hanger with hardware set 1 oper...
- 7 - vswr exceeds 1.8 to 1. This will stress the output stage and could destroy the rf transistors; this type of misuse and failure is not covered under warranty. Measure the vswr at the center of the operating band. Tune the antenna (according to the manufacturer’s tuning instructions) so that the...
- 8 - front panel controls 1. Microphone input a 6-pin, lock ring type, microphone connector is used. Microphone wiring is as follows: pin 1 : microphone audio pin 2 : receive pin 3 : transmit pin 4 : down (up w/ 22k ohm resistor) pin 5 : ground pin 6 : +13.8 vdc 2. Microphone gain control increases...
- 9 - rpt: repeater access tone. Most repeaters require an 88.5 hz tone burst to access. To activate the 88.5 hz tone burst, press the func control and then press the rpt button. Rpt will appear on the lcd indicating that the tone burst will now automatically be transmit- ted whenever the ptt is pre...
- 10 - 10. Clar \ func clar: clarifier. The clarifier shifts both the tx and rx frequency 1.5 khz each side of the center fre- quency. This is necessary for tuning to an ssb signal. Rotate the clarifier control clockwise or counterclock- wise to tune an ssb signal. Func: function. This control is us...
- 11 - 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 0 c after 15 m...
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.
