Signal tracers

Discussion in 'Homebrew and Kit Projects' started by KC4UMO, Aug 31, 2008.

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  1. KC4UMO

    KC4UMO Ham Member QRZ Page

    Thinking of building another signal tracer.
    Something no shack should be with out.
    I lost mine a few years ago when a flood hit the shack. The one I had was built by another ham and was tube type.

    So looking to build this one in the next day or so:
    http://www.qsl.net/iz7ath/web/02_brew/15_lab/01_tracer/pag01_eng.htm

    I would love to build one with a tube but have not looked many designs.

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  2. K7ELP

    K7ELP Ham Member QRZ Page

    Well I used to have a signal tracer, but found out I did not need it. I Have a RF generator that in addition to the adjustable RF out it has an adjustable audio out. With it I discovered that I could inject either audio or RF at an appropiate stage and track down the defective stage that way.
    73
    Ned
     
  3. K8ERV

    K8ERV QRZ Member QRZ Page

    Way back I serviced radios, usually used the signal tracing method.

    In your diagram, unless it is built into Q1, consider back-to-back diodes (1N914) across the input to prevent a damaging overload.

    TOM K8ERV Montrose Colo
     
  4. W4HAY

    W4HAY XML Subscriber QRZ Page

    I've used a Heath IT-12 tracer since back in the '60s. Here's a schematic.

    Pay attention to your layout of the 12AX7 stage. It has lots of gain and is susceptable to feedback (squealing).
     
    Last edited: Aug 31, 2008
  5. KC4UMO

    KC4UMO Ham Member QRZ Page

    Thanks for the replies guy's.
    I mostly use my IRF1200 for about everything. But sometimes having some small test equipment is nice, along with the joy of building it.

    W4HAY
    Thanks for that Heathkit schematic.
     
  6. KC4UMO

    KC4UMO Ham Member QRZ Page


    Just bought an IT-12 for 10 bucks. Came with a "new" looking probe. Not the switching type. Maybe get the chance to check it out this week. I also got a IT-28 capacitor checker.
     
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