IC-706MKIIG HF SO-239 Connector Issue

Discussion in 'Radio Circuits, Repair & Performance' started by AF4LY, Feb 17, 2016.

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  1. AF4LY

    AF4LY Ham Member QRZ Page

    When I have a PL-259 connector all the way in with the shell screwed all the way I can barely hear anything. The S-Meter doesn't move at all. However, when I unscrew the shell and remove the center pin part of the way I can hear signals normally.

    I have tested for a short between the center conductor of the SO-239 and the outer threaded part. There is no short according to my Ohmmeter. I open the rig up and removed the connector, the dialectric was as far as it could go. I re soldered and still the same thing.

    I'm not sure where to go from here except to send the radio in for servicing. Any suggestions?

    BTW, the 2/70cm connector works just fine. I also tested the power output on Wattmeter/Dummy Load that works fine. I have also used other coax cables for testing and still the same thing.
  2. N0SYA

    N0SYA Ham Member QRZ Page

    AF4LY likes this.
  3. W1VT

    W1VT Ham Member QRZ Page

    You could also have a defective antenna--can you swap the rig or the antenna to figure out whether the antenna is functioning properly?

    Zack W1VT
    AF4LY likes this.
  4. AF4LY

    AF4LY Ham Member QRZ Page

    I can put it into the the V/UHF jack and it will receive just fine. I was making some contacts on local repeaters and listening to the aircraft bands just fine.

    I appreciate the information. I didn't see anything for my specific issue, but I will keep looking. I am pretty sure at this point I'm going to send it in.
  5. W1VT

    W1VT Ham Member QRZ Page

    What is that antenna--is it designed for HF/6M as well as 2M/70 cm?

    It is quite possible that a 2M/70cm antenna won't let you hear anything on HF unless modified, such as connecting only one conductor so it acts as a random wire.

    If you just want to listen, 15 feet wire attached to the center conductor of a PL-259 may be adequate to hear things on HF, assuming the time of day is right for the band you are listening to. Hang it off the ceiling somehow. You can usually hear something, unless you are in a concrete and steel building.

    Zack W1VT
    Last edited: Feb 18, 2016
  6. AF4LY

    AF4LY Ham Member QRZ Page

    No, it's just a simple ladder-line j-pole. I don't have anything else setup yet. I am going to try the wire really quick.
  7. W1VT

    W1VT Ham Member QRZ Page

    The matching network for a J-pole acts as a dead short on HF. Nothing wrong with the rig or antenna, but they won't play together at HF.

    Zack W1VT
    AF4LY likes this.
  8. AF4LY

    AF4LY Ham Member QRZ Page

    Thank you very much! I just hooked up a connector coax to my mfj antenna tuner and rig, then connected a piece of speaker wire to the tuner. It works just fine!
  9. N0SYA

    N0SYA Ham Member QRZ Page

    Lol go figure.
  10. WA9SVD

    WA9SVD Ham Member QRZ Page

    No need to go figure. Just a basic understanding of troubleshooting techniques, and "how things work."

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