Swan 500 transmitt problems

Discussion in 'Ham Radio Discussions' started by WA2PBL, Jun 18, 2017.

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  1. WA2PBL

    WA2PBL Platinum Subscriber Platinum Subscriber QRZ Page

    Good day all. I just finished setting up and powering up my Swan 500 with A/C power supply model 117-C. I am feeding an end-fed wire on 40 meters. After power-up the MA meter comes down and receive capability is pretty good. That's where it ends. When I key my D104 or place the rig in Tune/CW mode there is NO output at all on any of my attached power meters, and the rigs meter stays right at 50ma. I try adjustments to both plate and loads and nothing changes. Since this is an older Rig I am looking for any help possible to get this old gal back on the air.
    Thanks In Advance...
  2. KD8DEY

    KD8DEY Subscriber QRZ Page

  3. KY5U

    KY5U Subscriber QRZ Page

    You need to read up a little on SSB tube rigs. Look at "idle current" first, then how the tune circuit works. If you have another rig, listen to see if it is transmitting even a weak signal. Make sure the driver tube and finals are there. Make sure relays are seated. So many possibilities....

    Kinda like saying "My car won't start. What's the problem?"
  4. KA9JLM

    KA9JLM Ham Member QRZ Page

    One of the first things I would do is to clean the band switch.

    Do you get the same result on all bands ?

    Good Luck.
  5. WA2PBL

    WA2PBL Platinum Subscriber Platinum Subscriber QRZ Page

    Thanks Everyone so far. I can relate to the point above "My car won't start what is the problem" LOL. I have read the manual cover to cover at least twice. I will try and see if it has any output at all be listening on my Yaesu. I am gonna test all the tubes first and clean the contacts. I'll post from there
  6. WA2PBL

    WA2PBL Platinum Subscriber Platinum Subscriber QRZ Page

    yes same results on all bands
  7. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    There are two relays that control transmit and receive operations,
    That would be a good place to start looking.
    KY5U likes this.
  8. KY5U

    KY5U Subscriber QRZ Page

    When I serviced tube rigs, before I even turned the rig on, I:

    1. Tested all tubes
    2. Cleaned any dirt and dust off the top of the chassis
    3. Cleaned tube sockets before re-inserting tubes
    4. Cleaned all relay contacts and plugs
    5. Cleaned any band switches
    6. Visually inspected the "underneath" for visible blown or mis-shaped components
    7. Verified the size of all fuses
    8. Verified the power cord was safe

    THEN I turned the rig on to test. This routine actually fixed over 95% of problems. I saved all my theorizin, and postulatin for the more modern rigs. :)
    KK4GGL, N8KC and KA9JLM like this.
  9. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    THIS^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ For Starters..
  10. WA2PBL

    WA2PBL Platinum Subscriber Platinum Subscriber QRZ Page

    In starting to check the manual I did notice, the power supply was a 117-C not a 117-XC. I don't know if that is an issue, but the manual does not mention a 117-C.

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