[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

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

    Mirage Manuals

    You can contact MFJ, to see if they can assist.
    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

    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.

    Last edited: Mar 7, 2010
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