[help] Mirage/klm B-2560 B problem

Discussion in 'Radio Circuits, Repair & Performance' started by YC8DDU, Mar 4, 2010.

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  1. YC8DDU

    YC8DDU Ham Member QRZ Page

    Please help ,,,,,

    Mirage / KLM B-2560 G belong to me, now only remaining output is only 250 W .. I've changed PA; MRF-141 four, but still not enough output 600 W, before I replace it MRF-141 output is only 150 W.

    Did anyone ever deal with problems like this? ... please help me; give me tips or suggestions how to improve the way where I do not have a scheme or service manual Mirage / klm B-2560 B, maybe you have it? please let me know where the download ........

    Thank you.... by: Amir, YC8DDU
     
  2. W9GB

    W9GB Ham Member QRZ Page

    Mirage / MFJ Amplifier web page
    http://www.mirageamp.com/

    When MFJ purchased Mirage, they indicated that documentation for
    the older Mirage amplifiers was missing or was incomplete.

    Mirage Manuals
    http://www.mirageamp.com/Manuals.php

    You can contact MFJ, to see if they can assist.
    http://www.mirageamp.com/customersupport.php
    You need to CLOSELY EXAMINE components used in the COMBINER used between the individual RF modules.

    I would start with Motorola Application Notes (now at Freescale) by Helge Granberg(sk)
    for this specific Motorola transistor (MRF-141).

    Motorola/Freescale Application Note AN211A
    Field Effect Transistors in Theory and Practice
    https://classshares.student.usp.ac.fj/EE212/Relevant Notes/Note 3b.pdf

    Application Note (MA/COM or Freescale)
    AN721: Impedance Matching Networks Applied to RF Power Transistors

    Motorola MRF-141 Datasheet
    This specific RF transistor was transferred to MA/COM
    http://www.cbtricks.com/Amp/datasheets/transistors/motorola/mrf141.pdf

    ASI Datasheet - MRF-141
    ASI manufactures a replacement line for many of the discontinued Motorola MRF transistors. These include bipolar and MOS MRF transistors in HF, VHF, UHF and microwave applications.
    http://www.advancedsemiconductor.com/pdf/mrf141.pdf

    w9gb
     
    Last edited: Mar 7, 2010
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