Heathkit HW 101 transmit trouble

Discussion in '"Boat Anchor" & Classic Equipment' started by WB9UBT, Mar 23, 2012.

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  1. WB9UBT

    WB9UBT Ham Member QRZ Page

    I have good power output on TUNE and CW but not on sidebands. I checked V1, replaced the four diodes in the balanced modulator circuit and checked the mode switch. Any ideas would be great!
     
  2. K9STH

    K9STH Ham Member QRZ Page

    You are talking into the microphone? You are activating the push to talk? Don't rely on the VOX! If so, then try a different microphone making sure it is high impedance.

    If the microphone is OK, then start looking from the microphone jack forward.

    Glen, K9STH
     
  3. KO6WB

    KO6WB Premium Subscriber QRZ Page

    The balanced modulator is placed into an unbalanced condition when you have an audio signal applied to it. The output of the balanced modulator is DSB and then you pass the DSB signal through the crystal filter and you now have SSB. So you don't have an audio signal being applied to the balanced modulator so there is nothing out.
    The manual for the HW-101 is available online at; http://gmcotton.com/Ham_Radio/MISC%20Manuals/Heathkkit/HW-101.pdf. It takes awhile for it to download so be hang in there.
    Hope this helps
    73
    Gary
     
  4. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    It might be good to start with the basics.
    Check the microphone first.
    See if you have audio....

    With that out of the way;
    See if the VOX circuit works,
    If it does you know the first audio stage is working...

    Also I might add tube failures are rare.
     
  5. KB4MNG

    KB4MNG Ham Member QRZ Page

    I just went thru a hw 101 for a friend. Same problem. I went thru cleaned everything there was to clean, disassembled the relay and cleaned it. 100 watts on all bands!
     
  6. KB4MNG

    KB4MNG Ham Member QRZ Page

    Also retighten all grounds....
     
  7. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    Always check the grounds.
    :)
     
  8. WB9UBT

    WB9UBT Ham Member QRZ Page

    PTT

    Yep, I am not using VOX, just the PTT.

    I am going to go back and check the mic tonight, might be looking a bit too deep.

     
  9. WB9UBT

    WB9UBT Ham Member QRZ Page

    I believe the relay is working because I am hearing it trip when I push the PTT on the mic.
     
  10. WB9UBT

    WB9UBT Ham Member QRZ Page

    I tried VOX and no luck. I'm going to double check the mic and get that out of the way.
     
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