## Re: Power Measurement

Expand Messages
• 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
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

-----------------------------
I love this radio stuff !
72, 73  Terry, WAØITP
• 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
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

------------ --------- --------
I love this radio stuff !
72, 73  Terry, WAØITP

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• ... 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
--- 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
all interested parties for 8500 yen to the paypal address
kasahara@.... Paypal will take care of the currency conversion
and exchange rate, etc.
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
• 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

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
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.
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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