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DISTORTION PROOBLEM ON MY RIG

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  • SailSouth4Fun@aol.com
    Well folks. I have a bit of a problem and don t have a clue what may be going on. I have a Kenwood TS-440S that I have had for at least 10-15 years now. Up
    Message 1 of 2 , May 11, 2009
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      Well folks. I have a bit of a problem and don't have a clue
      what may be going on. I have a Kenwood TS-440S that I
      have had for at least 10-15 years now. Up to 2 weeks ago
      everything was working fine. I work phone and CW with
      the radio. Here's the problem. When I work phone or CW
      on 20,15,10 meters the audio and CW tone is distorted. It
      sounds like RF is getting back into the rig but I have everything
      grounded as well as an extra ground wire from the mic plug
      to the radio ground to be sure I don't have a loose ground
      on the mic. Listening on another radio, the CW tone has a
      bit of a distorted kind of chirp. Hard to explain the sound.
      50db/S9 it is loud. If you were to hear me at S4 you probably
      wouldn't notice it at all. The phone audio is unusable. I am
      using a Mosley CL-33 at 60 feet with a well grounded tower.
      This is the same set up that I have used for years. Kenwood
      antenna tuner as well as the internal tuner. I have changed
      configurations around and nothing changes the problem.
       
      Here is where it gets stranger. I have a 40 meter inverted V
      at 40 feet that I also use on the same rig via antenna switch.
      When I work 40, phone or CW, NO distortion. Clean audio on
      phone and a nice clean tone on CW. Still through the same
      tuner and antenna switch. Again, same setup on the rig and
      antenna for 15 years. 
       
      I can get by with it on 20,15 and 10 CW but I would really like
      to be able to work phone there also as I have done since I
      was licensed in 1974. Only having 40 phone is getting a bit
      boring.
       
      Anyone have any ideas what might have happened in the last
      couple of weeks to distort the upper bands? I would be very
      grateful for any ideas or any help anyone can offer. I am going
      to post this everywhere I think there may be a person that has a
      thought concerning this problem. Thank you in advance. 73,
         
       
      Gary W. Froemming, CTC
      Certified Travel Counselor
      Glendale, Arizona, USA
      WB7CAG / W7GWF
      33.5601N / 112.1841W
      Grid Square: DM33vn74vk
      ----------------------------------------------------
      Glendale Amateur Radio Club # 1
      FISTS # 11904, SKCC # 4360
      NAQCC # 2694, 10-10 # 12753
      W7GWF SKCC # 5494
      FPQRP # 2035
      QRP-ARCI # 13321
      MQFD: Member
      QRP-Canada: Member
      AZ ScQRPions: Member
      AK-QRP Group # 771
      American QRP Club: Member
      EchoLink Node# 294370
      ---------------------------------------------------
    • Earl Needham
      ... I would almost bet there is some bit of corrosion on one of the grounds, or perhaps on that beam. You might do pretty good by putting a ferrite bead (or
      Message 2 of 2 , May 11, 2009
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        --- In cw_bugs@yahoogroups.com, SailSouth4Fun@... wrote:
        >
        >
        > Well folks. I have a bit of a problem and don't have a clue
        > what may be going on. I have a Kenwood TS-440S that I
        > have had for at least 10-15 years now. Up to 2 weeks ago
        > everything was working fine. I work phone and CW with
        > the radio. Here's the problem. When I work phone or CW
        > on 20,15,10 meters the audio and CW tone is distorted. It
        > sounds like RF is getting back into the rig but I have everything
        > grounded as well as an extra ground wire from the mic plug
        > to the radio ground to be sure I don't have a loose ground
        > on the mic. Listening on another radio, the CW tone has a
        > bit of a distorted kind of chirp. Hard to explain the sound.
        > 50db/S9 it is loud. If you were to hear me at S4 you probably
        > wouldn't notice it at all. The phone audio is unusable. I am
        > using a Mosley CL-33 at 60 feet with a well grounded tower.
        > This is the same set up that I have used for years. Kenwood
        > antenna tuner as well as the internal tuner. I have changed
        > configurations around and nothing changes the problem.

        I would almost bet there is some bit of corrosion on one of the grounds, or perhaps on that beam. You might do pretty good by putting a ferrite bead (or several) on the coax -- I think nearer the beam is better, but a bead can hardly hurt anywhere you put it. When I have a similar problem on a mobile, a bead on the coax near the base of the antenna usually cures the problem.

        7 3
        Earl
        KD5XB
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