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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 Ken Ha ha Stefan, how good is your Integration Ken? Here are a couple of sites that should answer your questions. You need a good dummy load and a good oscilloscope. Setting the conditions for the amplifier is to do with A/ the correct driver preferably using a FET drive chip (like TC4422 non and TC4421 inverting) that will turn the FET fully on and fully off on each cycle. Very fast rise time with accurate on off timing (mark / space). Ensuring the max permitted gate voltage for the FET is not exceeded otherwise they pop, look out for transients, a diode clamp helps. B/ Setting the shunt capacitance and inductance in the drain circuit can be done empirically See article below. Then follow it with a low pass filter, although the output wave will be surprisingly clean. Calculating the values is difficult as you don't necessarily know all the starting parameters and in any case the result is going to wide of the mark. The site below will gives some starting values. Best to use 'Scope measurements to set the output conditions. You are looking for fast, very fast On / Off rise times. Gate drive and understanding the drain circuit is the key. These amplifiers are capable of incredibly good efficiency well above a dodgy class C amp. This means the heat dissipation from the FET is very low at high power giving cool heat-sinks! The GW3UEP (do a web search) single ended design is capable good efficiency and high power depending upon the FET used and Drain supply voltage. I have modified one to run reliably at 140watts and is capable of almost twice that into a dummy load with a heat sink that is fairly cool. Adjusting L and C empirically using the 'scope to get the correct drain wave shape for max efficiency is the way to go. The article below shows you what you are looking for. I set my TX up into a 50 Ohm dummy load adjusting L and C to get the correct drain wave shape on the 'scope then measuring the peak voltage across the Dummy load. I then transfer my connector from the Dummy load to the input of the tuned [...] 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 [77.238.189.222 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 FSL_FREEMAIL_2 FSL_FREEMAIL_2 0.0 FSL_FREEMAIL_1 FSL_FREEMAIL_1 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 567a11ac6cfe1e88f3054745c06178fe Subject: LF: Class E etc Content-Type: multipart/alternative; boundary="-176341844-2029570276-1339438549=:67345" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, 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-SCORE: 1:2:476527552:93952408 X-AOL-SCOLL-URL_COUNT: 1 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d018.2 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d60174fd636415565 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ---176341844-2029570276-1339438549=:67345 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable =A0=0AHi Ken =0A=A0=0AHa ha Stefan, how good is=A0your Integration Ken?=0A= =A0=0AHere are a couple of sites that should answer your questions. You nee= d a good dummy load and a good oscilloscope. Setting the conditions for the= amplifier is to do with=A0 A/ the correct driver preferably using a FET dr= ive chip (like TC4422 non and TC4421 inverting) that will turn the FET full= y=A0on and fully off on each cycle. Very fast rise time with accurate=A0on = off timing (mark / space). Ensuring the=A0max permitted gate voltage for th= e FET=A0is not exceeded otherwise they pop, look out for transients, a diod= e clamp helps.=A0 B/ Setting the shunt capacitance and inductance=A0in the = drain=A0circuit can be done empirically See article below. Then follow it w= ith=A0a=A0low pass filter, although the output wave will be surprisingly cl= ean.=A0Calculating the values is difficult as you don't necessarily know al= l the starting=A0parameters and in any case=A0the result is=A0going to wide= of the mark. The site below will gives some starting values. Best to use '= Scope measurements to set the output conditions. You are looking for fast, very = fast On / Off rise times. Gate drive and understanding the drain circuit is= the key.=0AThese amplifiers are capable of incredibly good efficiency well= above a dodgy class C amp. This means the heat dissipation from the FET is= very low at high power=A0giving cool heat-sinks!=0A=A0=0AThe GW3UEP (do a = web search) single ended design is capable good efficiency=A0and high power= depending upon the FET used and Drain supply voltage. I have modified one = to run reliably at 140watts and is capable of almost twice that into a dumm= y load with a heat sink that is fairly cool. Adjusting L and C empirically = using the 'scope to get the correct drain wave shape for max efficiency is = the way to go. The article below shows you what you are looking for. I set = my TX up into a 50 Ohm dummy load adjusting L and C to get the correct drai= n wave shape on the 'scope then measuring the peak voltage across the Dummy= load.=A0I then transfer my=A0connector from the Dummy load to the input of= the tuned transformer in the antenna up-lead. I adjust the coupling link t= o give the same peak voltage=A0across the tuner link turns. You are not loo= king for maximum peak just the sames as across the dummy load indicating a = 50ohm match.=A0This is done by either=A0adding or reducing=A0the number of turns (about two turns) along with bringing the t= he transformer to resonance by measuring the peak=A0up-lead current, here y= ou are looking for the maximum peak.=A0=A0=0A=A0=0AOh yes and WIMA high vol= tage high value capacitors from Maplin work well.=0A=A0=0ARead the articles= and search info on class E amplifiers.=A0=0A=A0=0A=A0=0AFor some bed time = reading but ignor the math look at the Tuning Procedure and the pictures at= the end which tell it all really..... http://www.cs.berkeley.edu/~culler/A= IIT/papers/radio/Sokal%20AACD5-poweramps.pdf=0A=A0=0AFor design ideas=0Ahtt= p://www.classeradio.com/=0A=A0=0AFor a good practical circuit for a single = ended amp=A0that =A0is a scalable surefire design, no need to reinvent the = wheel.=0Ahttp://www.gw3uep.ukfsn.org/=0A=A0=0AFor antennas and antenna feed= methods a "look no where else site" =0Ahttp://www.strobbe.eu/on7yd/136ant/= =0A=A0=0A=0A73 es GL Pete M0FMT IO91UX ---176341844-2029570276-1339438549=:67345 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
 
= Hi Ken
=
 
Ha ha Stefan, how good= is your Integration Ken?
=  
Here are a couple of sit= es that should answer your questions. You need a good dummy load and a good= oscilloscope. Setting the conditions for the amplifier is to do with = A/ the correct driver=0A preferably using a FET drive chip (like TC4422 no= n and TC4421 inverting) that will turn the FET fully on and fully off = on each cycle. Very fast rise time with accurate on off timing (mark /= space). Ensuring the max=0A permitted gate voltage for the FET i= s not exceeded otherwise they pop, look out for transients, a diode clamp h= elps.  B/ Setting the shunt capacitance and inductance in the dra= in circuit can be done empirically S= ee article below. Then follow it with a low pass filter, although= the output=0A wave will be surprisingly = clean. Calculating the values is difficult as you don't necessarily kn= ow all the starting parameters and in any case the result is = ;going to wide of the mark. The site below will gives some starting values.= Best to use 'Scope measurements to set the= output conditions. You are looking for fast, very fast On / Off rise times= . Gate drive and understanding the drain circuit is the key.
These amplifiers are capable of incredibly= good efficiency well above a dodgy class C amp. This means the heat dissip= ation from the FET is very low at high power giving cool heat-sinks<= /span>!
=  
<= div id=3D"yiv1491679897yui_3_2_0_17_133936297646699">The GW3UEP (do a web search) single ended = design is capable good efficiency and= high power depending upon the FET used and Drain supply voltage. I have mo= dified one to run reliably at 140watts=0A and is capable of almost twice th= at into a dummy load with a heat sink that is fairly cool. Adjusting L and = C empirically using the 'scope to get the = correct drain wave shape for max efficiency is the way to go. The article b= elow shows you what you are looking for. I set my TX up into a 50 Ohm dummy= load adjusting L and C to get the correct drain wave shape on the 'scope t= hen measuring the peak voltage across the Dummy load. I then transfer = my connector from the Dummy load to the input of the tuned transformer= in the antenna up-lead. I adjust the coup= ling link to give the same peak voltage across the tuner link turns. Y= ou are not looking for maximum peak just the sames as across the dummy load= indicating a 50ohm match. This is=0A done by either adding=0A or= reducing the number of turns (about two turns) along with bringing th= e the transformer to resonance by measuring the peak up-lead current, here you are looking for the maximum peak.=   
 
Oh yes an= d WIMA high voltage high value capacitors from M<= /var>aplin work well.
 
= Read the articles and search info on class E=0A amplifiers. 
 
 
<= span>For some bed time reading but ignor the math look at the Tuning Proced= ure and the pictures at the end which tell it all really..... http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-pow= eramps.pdf
 
For design id= eas
 
= For a good practica= l circuit for a single ended amp that  is a sc= alable surefire=0A design, no need to=0A reinvent the=0A whee= l.
 
For antennas and antenna feed methods a "look no where else= site"
 
73 es GL Pete M0FMT IO91UX
---176341844-2029570276-1339438549=:67345--