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Heathkit HW-101 lives again

Discussion in '"Boat Anchor" & Classic Equipment' started by AA4OO, Feb 10, 2018.

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  1. AA4OO

    AA4OO Ham Member QRZ Page

    K9ASE, KC4UMO, KE4OH and 5 others like this.
  2. N2EY

    N2EY Premium Subscriber QRZ Page


    Does the rig have the CW filter?

    73 de Jim, N2EY
  3. AA4OO

    AA4OO Ham Member QRZ Page

    Yes. The CW filter works better than I expected it to based on the specs.
    N2EY likes this.
  4. W7UUU

    W7UUU QRZ Lifetime Member #133 Administrator Volunteer Moderator Platinum Subscriber Life Member QRZ Page


  5. AA4OO

    AA4OO Ham Member QRZ Page

    I've made a few CW QSOs now and set the VOX delay to a point where it's not dropping the relay between words at about 18wpm.

    Then I plugged in my headphones and it's
    Not designed foe modern headphones

    Any suggestions for using modern headphones? Can I just add resistance in-line?

    Also the speaker continues to operate at a low level even with headphone jack inserted. The manual states that the radio must be operated with a speaker connected, so I guess that load is required to remain in place.

    That 1000 Hz CW frequency is taking some getting used to.
  6. W9GB

    W9GB Ham Member QRZ Page

    Some Very Good Mods for the Heathkit HW-10x/SB-10x HF Transceivers
    by Joe Lunsford, N4YG
    Save this web site information to your hard drive (or print), for future reference.
    Why? Joe indicates that future of this web site will be reviewed, this year (2018). Mods.html

    Conversion to Low Impedance Stereo Headphones and Speaker Muting
    The original audio circuit in the HW-101 had some very nagging features.
    First, high impedance headphones were required. These were produced in large numbers during World War II, but it is difficult to find them and the audio quality is not great.
    Low impedance headphones are the modern standard and available in many styles and at low cost.
    Second, the speaker remains active (at somewhat lower level) when headphones are plugged in. This is totally unacceptable particularly if your station is near other people who are doing other things and do not want to hear your QSO. The simple modification described here will fix both of these problems.

    Sidetone Volume Control

    Conversion of the original AVC to AGC (Eliminates S-Meter Zero Drift)

    Simple Fix For A Heterodyne Oscillator That Will Not Oscillate

    T/R Relay Replacement,
    using Panasonic DS Relays for QSK operation

    The HW and SB series of transceivers have two 4-pole double-throw relays which provide the switching necessary for transitioning between the receive and transmit modes. Mod Description.pdf
    Circuits for this QSK modification use Vero Technologies (UK) Veroboards.

    Mike Yancy’s Heathkit HW-101 Restoration
    Last edited: Feb 11, 2018
  7. KA0HCP

    KA0HCP XML Subscriber QRZ Page

  8. W9GB

    W9GB Ham Member QRZ Page

    As Joe Langford shows, in his HW-101 modifications, you can use Audio transformer
    in your Heathkit HW-101 and MUTE the 8-ohm speaker !!

    The only Parts Requirement is a Stereo 1/4 inch jack with switches.
    Since majority of headphones today are Stereo (TRS) and not Monophonic.

    You can ask Joe what specific manufacturer and part number he used.
    Switchcraft and Neutrik are major mfg. of 1/4” (6.35mm) jacks.

    Neutrik Jack Circuits (attached file)

    Neutrik NMJ6HC-S (example)

    Attached Files:

    Last edited: Feb 11, 2018
  9. K3XR

    K3XR Ham Member QRZ Page

    Great work nice to see an HW-101 in such beautiful condition after all these years.
  10. W5RKL

    W5RKL Ham Member QRZ Page

    Congratulations on successfully returning your HW-101 to operational status.
    I use my HW-101 on CW a lot.

    If I may make a few suggestion.

    Find some spare 6GW8 audio tube. They are expensive so be prepared to pay a bit
    more than you might expect. V14A/B in my HW-101 failed, the glass envelope developed
    a crack allowing the vacuum to deplete, making the tube useless. I had no spare.
    I keep a couple spare 6GW8's around for the HW-101 and SB-100.

    Another suggestion is to change the linear amplifier relay control pin 11 wiring as shown in the
    picture below. There's a spare RCA socket on the rear panel of the HW-101. I heated and
    pulled the wire from pin 11 then connected and soldered the wire to the Spare RCA socket.
    I then made a label, "AMP RELAY" and pasted it above the spare RCA socket. This makes
    connecting an amplifier relay to the HW-101 very easy. I did the same thing to my SB-100.
    The relay position shown in the picture below is shown in "Transmit". The relay position
    changes in receive, removes the ground to pin 11 wire and the spare RCA Socket.


    Mike W5RKL
    WA7PRC likes this.

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