Kenwood TK-630H converted for 6m use question.....

Discussion in 'Mobile Radio Systems' started by KX4KDH, Dec 21, 2011.

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  1. KX4KDH

    KX4KDH Ham Member QRZ Page

    Hi, all....

    I have a Kenwood TK-830 that I have "converted" for 6m FM use. Basically, all I have done so far is adjust the TX VCO coil so it will stay locked up to 54.00. I have noticed that RF output power has dropped drastically. It went from 110w to 85w when transmitting from 50-54MHz.

    Is there a way I can recover my lost TX power without using an external amplifier?

  2. W9GB

    W9GB Ham Member QRZ Page

    Scott -

    I see that you have been working on this project over the past few months.

    I do not know which model (Mid-Cut or High-Cut) of the TK-630 that you have, but I assume it is the High-Cut model
    FCC ID: ALHTK-630H-3: which covers the 41.0 to 54.0 MHz segment of Low-VHF allocation (Land Mobile)
    These are the EASIEST models to migrate to the amateur radio 6 meter allocatioon - 50 - 54 MHz

    Portage County (Ohio) Amateur Radio Service, Inc. (PCARS)
    Their RADIOGRAM, January 2009 on Page 11 discusses the usage of this Kenwood radio.

    All previous conversions that I have referenced have noted that careful realignment of the VCO
    AND the Front End are required for proper operation.

    Do you have the Service Manual (alignment/tuning of radio receiver and PA section) ??

    85 watts RF output ... is likely per original factory spec for the PA section -- drops off past 50 MHz.
    You can likely retune or change compoennts in the PA baord -- BUT -- I woudl NEVE do this blindly (golden screwdriver thinking).

    The Servcie Manual normally covers this (voltage readings, compoennt changes, equipment needed, etc.) for the Kenwood Service Technician.

    You can post this specific quesiton to Radio Information Board (Kenwood commercial section) or Repeater Builders TIP ...
    and likely get some additional advice from one of the Kenwood Land Mobile techs -- who woudl have the service manual (and some bench experience with this model).
    Kenwood notes for converting TK-630 Mid-cut (35.0MHz-42.98MHz) to High-cut (41.0MHz-49.98MHz)
    Conversion notes per Kenwood manual # B51-8151-10(O) 1169
    December 2001 - Paul J. Lorona KB6MIP with Kenwood list of components required to be changed (and values).

    Last edited: Dec 21, 2011
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