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HTX-100 modified for Satellite help!

Discussion in 'General Ham Radio Discussion' started by WX9DX, Jun 9, 2014.

  1. WX9DX

    WX9DX
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    I bought an HTX100 at a Ham Fest near St Louis IL, Winterfest 2012 or 13. And the radio had been modified for a transverter, It has TP5 and 6 jumped with a wire and the plug in board missing. Also there is an RCA connector connected to a wire next to VR9 for a RX only antenna or a transverter input for a 28 Mhz IF use. If you are familiar with this mod please let me know what I have to do to return this radio back to normal please. Also maybe what I might do to acquire one of the plug in boards or how to jumper it out so it is not needed, the one between TP5 and 6...

    Thanks much
    Jimmy, WX9DX:(
    [/I]

    This Htx100, It's fighting me! But I'll win sooner or later. :)
    ^^ ab v c^^


     

  2. AudioShockwav

    AudioShockwav
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    This will help you on your journey, it is one way of setting up htx 100 as a exciter for external transverters

    Make Your HTX-100 a Flexible IF Transceiver


    The mirror board that sits in the 3 sets of fingers supply's the pa driver and final, if you pull it and only supply the driver section, you can get the low level 28.xxx MHz signal needed by the transverter.
    The cable taps it off after the driver section, you just need to figure out how they did it, and reverse it.

    73
    Jeff
     
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  3. WX9DX

    WX9DX
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    The vertical board???

    I sure could use a few pics of that vertical board near the final. There aren't any in the service manual as far as I can tell... Thanks Jimmy:)
     
  4. AudioShockwav

    AudioShockwav
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    It is there to provide voltage to the final and driver, you can remove it when working on the radio to have a test point so you can put your dc current meter inline to measure the bias for the final and driver transistor, then it is placed back in.
    A wire soldered to all three of the test points, so that they are interconnected would serve the same purpose.


    73
    Jeff
     
  5. AudioShockwav

    AudioShockwav
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    The service manual can be found here *
    http://www.cbtricks.com/radios/realistic/htx_100/graphics/realistic_htx_100_sm.pdf

    scroll down to the alignment section and see procedure for setting the bias on step 1 and 2, that board, pb100, connects tp4, tp5 and tp6 all hooked together when the radio is not being serviced.
    look carefully at the schematic and trace out the tx section and see if they have modified anything else.
    This was a way to drop the tx power to a low level for the transverter by removing the board and only supplying v to the driver transistor.
    VR 9 controls the RF meter in the radio, wonder if they were using a external S meter on the radio?


    73
    Jeff

    * Many thanks go out to Bennie at CBTricks for his work providing and sharing such a wealth of info.
     

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