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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Mal and group The Drain wave trailing edge spike is shown clearly in this PDF on microwave Class e amps although microwave the principle applies to MF as well. In the PDF, Nathan O. Sokal author, has produced a IMHO cool chart to track the changes necessary to produce the near perfect Drain wave. To save reading the whole thing scroll to the end of the article and see the chart. I have played with the drain wave on one or two HB amps and the chart works as advertised.... no sums just cut and try! http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps.pdf [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [77.238.189.213 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: cd16d8c2fb75309db133b7de4adb1391 Subject: Re: LF: Re: My transmit converter description Content-Type: multipart/alternative; boundary="131296447-1163392129-1360070559=:34662" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mtain-mc01.r1000.mx.aol.com ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d60495111080570bd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --131296447-1163392129-1360070559=:34662 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Mal and group=0A=A0=0AThe Drain wave=A0trailing edge spike is shown clea= rly in this PDF on microwave Class e amps although microwave the principle = applies=A0to MF as well. In the PDF, Nathan O. Sokal author, has produced a= IMHO cool chart to track the changes necessary to produce the near perfect= Drain wave. To save reading the whole thing scroll to the end of the artic= le and see the chart.=0AI have played with the drain wave on one or two HB = amps and the chart works as advertised.... no sums just cut and try!=A0=A0= =A0http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-power= amps.pdf=0A=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A>_________________________= _______=0A> From: mal hamilton =0A>To: rsgb_lf_group= @blacksheep.org =0A>Sent: Tuesday, 5 February 2013, 12:16=0A>Subject: LF: R= e: My transmit converter description=0A> =0A>Dimitris=0A>Your 'scope shot = of the signal after the low pass filter shows a Voltage=0A>spike which shou= ld not be there for a class E amplifier. This needs to be=0A>smoothed out o= therwise you wil eventually Zap the PA Fet.=0A>You need to adjust L2 to cor= rect this problem.=0A>de Mal/G3KEV=0A>=0A>----- Original Message -----=0A>F= rom: "Dimitrios Tsifakis" =0A>To: =0A>Sent: Tuesday, February 05, 2013 12:50 AM=0A>Subject: LF: My = transmit converter description=0A>=0A>=0A>> Hello group,=0A>>=0A>> My trans= mit converter is now finished and tested - it survived two=0A>> sessions of= 50% duty cycle WSPR transmissions on 475 kHz and the=0A>> results are grea= t. I thought others may find this useful, so I have=0A>> put a write-up on = my web page:=0A>>=0A>> http://people.physics.anu.edu.au/~dxt103/472/nltt/= =0A>>=0A>> It is a 50 W class-e PA designed for 50 ohm impedance, so there = is no=0A>> need for an impedance transformer. Doesn't get simpler than that= :-)=0A>> The driving circuit is based on G3XBM Roger's design with the=0A>= > difference of a 10 MHz OCXO LO and the addition of a beefy MOSFET=0A>> dr= iver.=0A>>=0A>> 73, Dimitris VK1SV=0A>>=0A>=0A>=0A>=0A>=0A> --131296447-1163392129-1360070559=:34662 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Mal and group
 
The Drain wave trailing e= dge spike is shown clearly in this PDF on microwave Class e amps although m= icrowave the principle applies to MF as well. In the PDF, Nathan= O. Sokal author, has produced a IMHO cool chart to track the changes neces= sary to produce the near perfect Drain wave. To save reading the whole thin= g scroll to the end of the article and see the chart.<= /div>
I have played with the drain wave on one or two HB amps and= the chart works as advertised.... no sums just cut and try!  &nb= sp;http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%= 20AACD5-poweramps.pdf
73 es GL Pete = M0FMT IO91UX
From: mal hamilton <g3kevmal@ta= lktalk.net>
To: rsgb_lf_group@blacksheep.org
Se= nt: Tuesday, 5 February 2013, 12:16
Subject: LF: Re: My transmit converter description=

Dimitris
Your 'scope shot of the signal after th= e low pass filter shows a Voltage
spike which should not be there for a = class E amplifier. This needs to be
smoothed out otherwise you wil event= ually Zap the PA Fet.
You need to adjust L2 to correct this problem.
= de Mal/G3KEV

----- Original Message -----
From: "Dimitrios Tsifak= is" <dtsifakis@gmail.com>
To: <rsgb= _lf_group@blacksheep.org>
Sent: Tuesday, February 05, 2013 12:50 = AM
Subject: LF: My transmit converter description


> Hello group,
>
> My transmit converter is now finished and tested - = it survived two
> sessions of 50% duty cycle WSPR transmissions on 47= 5 kHz and the
> results are great. I thought others may find this use= ful, so I have
> put a write-up on my web page:
>
> http://people.physics.anu.edu.au/~dxt103/472/nltt/
>
> It = is a 50 W class-e PA designed for 50 ohm impedance, so there is no
> = need for an impedance transformer. Doesn't get simpler than that :-)
>= ; The driving circuit is based on G3XBM Roger's design with the
> dif= ference of a 10 MHz OCXO LO and the addition of a beefy MOSFET
> driv= er.
>
> 73, Dimitris VK1SV
>




<= /div>
--131296447-1163392129-1360070559=:34662--