Loading ...
Sorry, an error occurred while loading the content.

Fw: [AT_Sprint] Re: ATS-series BS-170 Finals and Tuning Protection

Expand Messages
  • John Greusel
     This is from another list and a post about BS170 s from the venerable Steve Weber. I d hate to put my melon in a loop while it s transmitting! Interesting
    Message 1 of 1 , Nov 24, 2012
    • 0 Attachment

       This is from another list and a post about BS170's from the venerable Steve Weber.
      I'd hate to put my melon in a loop while it's transmitting! Interesting comments though.

      John
      KC9OJV


      ----- Forwarded Message -----
      From: Steven Weber <steve.kd1jv@...>
      To: AT_Sprint@yahoogroups.com
      Sent: Saturday, November 24, 2012 1:19 PM
      Subject: Re: [AT_Sprint] Re: ATS-series BS-170 Finals and Tuning Protection

       


      > I've already burned up two sets of B170s -- one with an inadvertent high
      > SWR using an AlexLoop (when on a SOTA a stranger stuck his head near the
      > loop to read the label and in the process totally de-tuned the loop),

      ^^^ Thats not something one would expect to happen! Heat sinking has little
      or nothing to do with it. If the FETs are running more than slightly warm to
      the touch, even at 5W out, then something isn't right.

      As I've noted before, over current is the PA killer. The simplest protection
      would be a 1A fast blow in-line fuse (and a fist full of spares). This is a
      good idea to add when using any high current capacity supply, battery or
      bench.

      I suppose it could be possible to make a fast current limiter. One which
      would reduce the voltage to keep the current from exceeding a safe level
      would be ideal, rather then the over current rest I did on the 3B's which
      most people found more annoying then useful. I'll have to think about that.

      72, Steve KD1JV



    Your message has been successfully submitted and would be delivered to recipients shortly.