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Re: [GenesisRadio] High SWR in PA Bias test

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  • Bruce kf1z
    please make sure you read and follow my last email! bruce From: Daniel Forthman Sent: Sunday, June 23, 2013 5:52 PM To: GenesisRadio@yahoogroups.com Subject:
    Message 1 of 5 , Jun 23, 2013
      please make sure you read and follow my last email!
       
      bruce
       
       
      Sent: Sunday, June 23, 2013 5:52 PM
      Subject: Re: [GenesisRadio] High SWR in PA Bias test
       
       


      Bruce,

      I think i found the problem. Or at least part of it.  After checking all continuity of the cables it dawded on me to check the Dummy load.
      Dummy load is open!

       

      From: Bruce kf1z <kf1z@...>
      To: GenesisRadio@yahoogroups.com
      Sent: Sunday, June 23, 2013 7:45 PM
      Subject: Re: [GenesisRadio] High SWR in PA Bias test
       
       
      You have not calibrated the SWR section and high swr protection circuit yet..... that's why
       
      Of course, when you do the bias adjustment, there is no power output... since
      the cable from soundcard line out is disconnected ( must be!)
       
      You cannot set bias with output power... you take a big chance of destroying one or more
      output mosfets.
       
      You cannot set SWR circuit, until you have set bias, and achieved 10 watts on each band
      ( measuring from external wattmeter.)
       
      BRuce
       
       
       
       
      From: Forthman
      Sent: Sunday, June 23, 2013 2:56 PM
      Subject: [GenesisRadio] High SWR in PA Bias test
       
       

      Bruce,

      When i do the PA Bias adjustment with a watt meter and 50 watt dummy load.
      I get a HIGH SWR Red letter alert. SWR in software display read 19:1
      SWR meter also read high.
      RG58 cable used. 10 inch long. It seems the SWR circuit works as i see it kick in and lower output and then try again but cut right out again.
      What have i done wrong?

      Dan
      KF5VHO



    • Daniel Forthman
      Yes sir did and understood.   Thnaks   ________________________________ From: Bruce kf1z To: GenesisRadio@yahoogroups.com Sent: Sunday,
      Message 2 of 5 , Jun 24, 2013
        Yes sir did and understood.
         
        Thnaks
         

        From: Bruce kf1z <kf1z@...>
        To: GenesisRadio@yahoogroups.com
        Sent: Sunday, June 23, 2013 9:42 PM
        Subject: Re: [GenesisRadio] High SWR in PA Bias test
         
        please make sure you read and follow my last email!
         
        bruce
         
         
        Sent: Sunday, June 23, 2013 5:52 PM
        Subject: Re: [GenesisRadio] High SWR in PA Bias test
         
         

        Bruce,

        I think i found the problem. Or at least part of it.  After checking all continuity of the cables it dawded on me to check the Dummy load.
        Dummy load is open!

         
        From: Bruce kf1z <kf1z@...>
        To: GenesisRadio@yahoogroups.com
        Sent: Sunday, June 23, 2013 7:45 PM
        Subject: Re: [GenesisRadio] High SWR in PA Bias test
         
         
        You have not calibrated the SWR section and high swr protection circuit yet..... that's why
         
        Of course, when you do the bias adjustment, there is no power output... since
        the cable from soundcard line out is disconnected ( must be!)
         
        You cannot set bias with output power... you take a big chance of destroying one or more
        output mosfets.
         
        You cannot set SWR circuit, until you have set bias, and achieved 10 watts on each band
        ( measuring from external wattmeter.)
         
        BRuce
         
         
         
         
        From: Forthman
        Sent: Sunday, June 23, 2013 2:56 PM
        Subject: [GenesisRadio] High SWR in PA Bias test
         
         
        Bruce, When i do the PA Bias adjustment with a watt meter and 50 watt dummy load. I get a HIGH SWR Red letter alert. SWR in software display read 19:1 SWR meter also read high. RG58 cable used. 10 inch long. It seems the SWR circuit works as i see it kick in and lower output and then try again but cut right out again. What have i done wrong? Dan KF5VHO
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