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Re: Power Measurement

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  • Steven Pituch
    I am not too sure of the math, but I think V*V/2R makes sense. The peak detector measures peak DC Voltage. So RMS is .707. Square that for V*V and you get
    Message 1 of 9 , May 5, 2008
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      I am not too sure of the math, but I think V*V/2R makes sense.  The peak detector measures peak DC Voltage.  So RMS is .707.   Square that for V*V and you get .5, and that makes the 2 in the denominator. 
       
      Does that sound right?
       
      Steve, W2MY
      ----- Original Message -----
      From: WA0ITP
      Sent: Monday, May 05, 2008 7:50 PM
      Subject: Re: [AT_Sprint] Power Measurement

      I dont have SSD, but wonder about the V*V/2R calculation based on voltage at the antenna jack. No doubt the design of the probe dictates the 2R in the denominator.  At the antenna jack and across a 50 ohm load, how about Vrms^2/50 ? 
       
       I like to use the scope across a 50 ohm dummy load and use 
      ((Vp-p/2.8)^2)/50
       
      Whats your favorite formula?
      -----------------------------
      I love this radio stuff !
      72, 73  Terry, WAØITP
    • WA0ITP
      Yep, didnt realize it was a peak detector. Several ways to do the calculations, the most difficult part is obtaining accurate voltage measurements to work
      Message 2 of 9 , May 5, 2008
      • 0 Attachment
        Yep, didnt realize it was a peak detector. Several ways to do the calculations, the most difficult part is obtaining accurate voltage measurements to work with.
         
        -----------------------------
        I love this radio stuff !
        72, 73  Terry, WAØITP
        www.wa0dx.org/wa0itp
        www.4sqrp.com
        www.hams4u.com
         
          
        ----- Original Message -----
        Sent: Monday, May 05, 2008 8:30 PM
        Subject: [AT_Sprint] Re: Power Measurement

        I am not too sure of the math, but I think V*V/2R makes sense.  The peak detector measures peak DC Voltage.  So RMS is .707.   Square that for V*V and you get .5, and that makes the 2 in the denominator. 
         
        Does that sound right?
         
        Steve, W2MY
        ----- Original Message -----
        From: WA0ITP
        Sent: Monday, May 05, 2008 7:50 PM
        Subject: Re: [AT_Sprint] Power Measurement

        I dont have SSD, but wonder about the V*V/2R calculation based on voltage at the antenna jack. No doubt the design of the probe dictates the 2R in the denominator.  At the antenna jack and across a 50 ohm load, how about Vrms^2/50 ? 
         
         I like to use the scope across a 50 ohm dummy load and use 
        ((Vp-p/2.8)^ 2)/50
         
        Whats your favorite formula?
        ------------ --------- --------
        I love this radio stuff !
        72, 73  Terry, WAØITP


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      • dombaines
        ... Hi, I am working on a through hole version, same 2.7 x 2 format so fits in an altoid tin with locally available transistors and diodes, all either Mouser
        Message 3 of 9 , May 7, 2008
        • 0 Attachment
          --- In AT_Sprint@yahoogroups.com, Kurt Savegnago <ksaves2@...> wrote:
          >
          > Someone I bet will kit it here. Looks to doggone
          > good.
          >
          > Kurt KC9LDH
          > --- Roland Whitsitt <n5vwn@...> wrote:
          >
          > > Anybody know how I can aquire one of those amp kits
          > > shown in the file section? I think it
          > > was made by JN1GLB. And what's the cost?
          > > Roland N5VWN in Californy

          Hi,

          I am working on a through hole version, same 2.7" x 2" format so fits
          in an altoid tin with locally available transistors and diodes, all
          either Mouser or Digikey variants. I am using ExpressPCB to create
          the PCB layout which means Blue Press n Peel film means I can etch my
          own. I hope to have it ready for FDIM 2008.

          A few have looked at reworking the NB6M Miniboots PA for a while and
          Chuck Carpenter has a nice little PA out soon that is using a modern
          alternative for the IRF510 MOSFET which should run cooler and more
          efficiently, last I read it should be out about the time FDIM 2008
          comes around. Note that JN1GLB, Makota-san is rekitting and you can
          order from him directly. 8500 Yen is about £41 or $80

          73

          Dom
          M1KTA

          UPDATE 5MAY08
          Please contact Mr. Kasahara. He has volunteered to supply this kit to
          all interested parties for 8500 yen to the paypal address
          kasahara@.... Paypal will take care of the currency conversion
          and exchange rate, etc.
          Best of luck building this kit, and please upload photos to
          http://www.flickr.com/groups/ats_qrp/ for discussion.
          This isn't necessarily QRP, but certainly a top-flight kit that will
          be a pleasure to build. I am also eager to have more English-speaking
          hams look at the PDF I translated to tell me where I made mistakes. I
          am very receptive to that.
          Best 73,
          Jonathan Haynes

          If you have Japanese fonts installed and want to see his original
          message, here it is:
          こんにちは、Jonathanさん、
          私は、数台のKitを用意することが可能です。
          彼らには、直接私にメールを送るように伝えてください。
          subjectは、必ず[ALTOIS PA]と書いてもらってください。
          価格は、日本円で8500円です。Paypalでの支払いとなります。
          I can prepare for some Kit.
          Tell them to send mail to me directly(kasahara@...).
          A price is 8500 yen(paid by Paypal).
          Makoto Kasahara / JN1GLB
        • makoto kasahara
          Hi, All... If you want ALTOIDS PA, Please e-mail to me, at first. The rest of the present kits are one. Makoto Kasahara / JN1GLB ... From: dombaines
          Message 4 of 9 , May 7, 2008
          • 0 Attachment

            Hi, All...

            If you want ALTOIDS PA,

            Please e-mail to me, at first.

            The rest of the present kits are one.

             

            Makoto Kasahara / JN1GLB



            ----- Original Message ----
            From: dombaines <dombaines@...>
            To: AT_Sprint@yahoogroups.com
            Sent: Wednesday, May 7, 2008 9:30:14 PM
            Subject: [AT_Sprint] Re: PA for the ATS?

            --- In AT_Sprint@yahoogrou ps.com, Kurt Savegnago <ksaves2@... > wrote:
            >
            > Someone I bet will kit it here. Looks to doggone
            > good.
            >
            > Kurt KC9LDH
            > --- Roland Whitsitt <n5vwn@...> wrote:
            >
            > > Anybody know how I can aquire one of those amp kits
            > > shown in the file section? I think it
            > > was made by JN1GLB. And what's the cost?
            > > Roland N5VWN in Californy

            Hi,

            I am working on a through hole version, same 2.7" x 2" format so fits
            in an altoid tin with locally available transistors and diodes, all
            either Mouser or Digikey variants. I am using ExpressPCB to create
            the PCB layout which means Blue Press n Peel film means I can etch my
            own. I hope to have it ready for FDIM 2008.

            A few have looked at reworking the NB6M Miniboots PA for a while and
            Chuck Carpenter has a nice little PA out soon that is using a modern
            alternative for the IRF510 MOSFET which should run cooler and more
            efficiently, last I read it should be out about the time FDIM 2008
            comes around. Note that JN1GLB, Makota-san is rekitting and you can
            order from him directly. 8500 Yen is about £41 or $80

            73

            Dom
            M1KTA

            UPDATE 5MAY08
            Please contact Mr. Kasahara. He has volunteered to supply this kit to
            all interested parties for 8500 yen to the paypal address
            kasahara@nisiq. net. Paypal will take care of the currency conversion
            and exchange rate, etc.
            Best of luck building this kit, and please upload photos to
            http://www.flickr. com/groups/ ats_qrp/ for discussion.
            This isn't necessarily QRP, but certainly a top-flight kit that will
            be a pleasure to build. I am also eager to have more English-speaking
            hams look at the PDF I translated to tell me where I made mistakes. I
            am very receptive to that.
            Best 73,
            Jonathan Haynes

            If you have Japanese fonts installed and want to see his original
            message, here it is:
            &#12371;&#12435; &#12395;& #12385;&# 12399;&#12289; Jonathan& #12373;&# 12435;&#12289;
            &#31169;&#12399; &#12289;& #25968;&# 21488;&#12398; Kit&#12434; &#29992;& #24847;&# 12377;&#12427; &#12371;& #12392;&# 12364;&#21487; &#33021;& #12391;&# 12377;&#12290;
            &#24444;&#12425; &#12395;& #12399;&# 12289;&#30452; &#25509;& #31169;&# 12395;&#12513; &#12540;& #12523;&# 12434;&#36865; &#12427;& #12424;&# 12358;&#12395; &#20253;& #12360;&# 12390;&#12367; &#12384;& #12373;&# 12356;&#12290;
            subject&#12399; &#12289;& #24517;&# 12378;[ALTOIS PA]&#12392;& #26360;&# 12356;&#12390; &#12418;& #12425;&# 12387;&#12390; &#12367;& #12384;&# 12373;&#12356; &#12290;
            &#20385;&#26684; &#12399;& #12289;&# 26085;&#26412; &#20870;& #12391;8500& #20870;&# 12391;&#12377; &#12290;Paypal& #12391;&# 12398;&#25903; &#25173;& #12356;&# 12392;&#12394; &#12426;& #12414;&# 12377;&#12290;
            I can prepare for some Kit.
            Tell them to send mail to me directly(kasahara@nisiq. net).
            A price is 8500 yen(paid by Paypal).
            Makoto Kasahara / JN1GLB



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