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Thread: marker unit IC-EX241

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  1. #1

    Default marker unit IC-EX241

    search scheme for marker unit IC-EX241 or list component:

    R1 - .....
    R2 - .....
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    IC1 - .....
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    IC3 - 78L05
    C1 - .....
    C2 - .....
    C3 - .....
    C4 - .....
    C5 - .....
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    D1 - .....
    D2 - .....
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    X1 - .....

  2. #2

    Post

    The manual / schematic for the EX-241 does not exist on the Icom Global Support web page
    http://www.icom.co.jp/world/support/...nual/index.php

    HOWEVER, You need to ASK Icom Global Support to SCAN their paper schematics for your usage/repair.
    Icom has fulfilled EVERY request that I have made -- via this route -- in the past. TRY IT -- YOU WILL LIKE IT !
    http://www.icom.co.jp/world/support/...ies/index.html

    Icom IC-241 is a marker generator option for the Icom IC-745 HF transceiver.
    Page 26 and 27 of the IC-745 owner's manual outlines the installation of this option for the radio.
    http://www.radioamateur.eu/schemi/IC745_user.pdf

    The ARRL Handbook has featured 100 KHz/25 kHz marker generators for a number of years. This should be very easy to adopt to your Icom radio!!

    Here is the PC board layout and schematic from the ARRL.
    Marker Generator with Selectable Output -- Chapter 26
    http://www.arrl.org/notes/hbk-templates/markgen.pdf

    FAR Circuits also features a PC board
    http://www.farcircuits.net/freq2.htm
    Crystal calibrator that can use either a 1MHz, 2 MHz or 4 MHz reference crystal. The frequency output of 100, 50 or 25 KHz is switch selectable.
    The project uses two 7474s, a 7400, and a 7490 IC.

    The VE3DNL Marker Generator -- was offered by the Norcal QRP Club
    http://www.norcalqrp.org/files/NorCa...enerator_A.pdf

    ====
    w9gb
    Last edited by W9GB; 01-26-2010 at 06:40 PM.
    Nullius in verba

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