Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 11881380001B2; Wed, 12 Sep 2012 13:01:24 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TBqIb-0007ex-Nr for rs_out_1@blacksheep.org; Wed, 12 Sep 2012 18:00:25 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TBqIb-0007eo-3S for rsgb_lf_group@blacksheep.org; Wed, 12 Sep 2012 18:00:25 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TBqIZ-0003so-37 for rsgb_lf_group@blacksheep.org; Wed, 12 Sep 2012 18:00:24 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q8CH0LTX002434 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 12 Sep 2012 19:00:21 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q8CH0L7o001073 for ; Wed, 12 Sep 2012 19:00:21 +0200 Message-ID: <5050BEE4.8020107@iup.uni-heidelberg.de> Date: Wed, 12 Sep 2012 18:57:08 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <007901cd90f7$34e24ba0$0501a8c0@xphd97xgq27nyf> <017f01cd9104$14431610$1502a8c0@Clemens04> In-Reply-To: X-Spam-Score: -1.1 (-) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. 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: ... i'm on the way to built such a modulator too. Schemtic is ready (draft) and parts have been ordered today! For 400W it may be easy but... Another part of that new power supply will be a CCM PFC using a IR1150... Interesting stuff! [...] Content analysis details: (-1.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 6ae5fe68d6708d1e4a9cbdf0f0af43e5 Subject: Re: LF: Fw: LOST TRACK Content-Type: multipart/alternative; boundary="------------010609060506000801070700" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE 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-sid: 3039ac1d60d85050bfe4540c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------010609060506000801070700 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit ... i'm on the way to built such a modulator too. Schemtic is ready (draft) and parts have been ordered today! For 400W it may be easy but... Another part of that new power supply will be a CCM PFC using a IR1150... Interesting stuff! 73, Stefan Am 12.09.2012 18:44, schrieb Graham: > Jim M0BMU > Published a design and made a working system ........ he also > eliminated the need for a complicated drive by using > complimentary out put devices ... I don't know who else made > such a thing .... ? > G.. > PS :: I vote for Jims design ! > > *From:* Clemens Paul > *Sent:* Wednesday, September 12, 2012 5:31 PM > *To:* rsgb_lf_group@blacksheep.org > *Cc:* rsgb_lf_group@yahoogroups.co.uk > > *Subject:* Re: LF: Fw: LOST TRACK > > >You can use a class E/D amp in linear , with envelope > restoration , that maintains the efficiency , s/n >imd is > about 35 dB . > To my knowledge the first description in amateur literature of an > EER (envelope elimination and restauration) PA (400W) was by DJ7AW in > CQ-DL 4/2001. > It's still in service. > I have the article as pdf (in German) and can send it to anyone > interested in building such > a PA which is not an easy task.Therefore,as far as I know, only > two such PAs have been built. > One by DJ7AW and one in South America (Joe?). > 73 > Clemens > DL4RAJ > > ----- Original Message ----- > *From:* Graham > *To:* rsgb_lf_group@blacksheep.org > > *Sent:* Wednesday, September 12, 2012 5:17 PM > *Subject:* Re: LF: Fw: LOST TRACK > > Mal, > Things have moved on a bit > You can use a class E/D amp in linear , with envelope > restoration , that maintains the efficiency , s/n imd is > about 35 dB . > The Op structure allows for up to 50% loss of signal > randomly along the time line , ie first 50% , last 50% or > randomly distributed > Problem with short burst is the 'average energy' level , like > a radar , huge KW peak powers but only watts average power > .....and yes , wide bandwidth . > Detecting a carrier is one thing .. to recover data is a > much more difficult thing and requires a higher level of energy > G.. > > Virendatenbank: 2437/5264 - Ausgabedatum: 12.09.2012 > --------------010609060506000801070700 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit ... i'm on the way to built such a modulator too. Schemtic is ready (draft) and parts have been ordered today! For 400W it may be easy but...
Another part of that new power supply will be a CCM PFC using a IR1150... Interesting stuff!

73, Stefan

Am 12.09.2012 18:44, schrieb Graham:
Jim M0BMU  
 
Published  a  design  and  made a working  system  ........  he  also  eliminated the  need  for  a complicated   drive  by using  complimentary   out put  devices  ... I don't know  who else  made such a thing .... ?
 
G.. 
 
PS ::  I vote  for  Jims  design   ! 

Sent: Wednesday, September 12, 2012 5:31 PM
Subject: Re: LF: Fw: LOST TRACK

>You  can  use a  class  E/D    amp  in linear , with  envelope  restoration  , that  maintains  the  efficiency  , s/n   >imd   is  about   35 dB .
 
To my knowledge the first description in amateur literature of an
EER (envelope elimination and restauration) PA (400W) was by DJ7AW in CQ-DL 4/2001.
It's still in service.
I have the article as pdf  (in German) and can send it to anyone interested in building such
a PA which is not an easy task.Therefore,as far as I know, only two such PAs have been built.
One by DJ7AW and one in South America (Joe?). 
 
 
73
Clemens
DL4RAJ
----- Original Message -----
From: Graham
Sent: Wednesday, September 12, 2012 5:17 PM
Subject: Re: LF: Fw: LOST TRACK

Mal,
 
Things  have  moved on a bit
 
You  can  use a  class  E/D    amp  in linear , with  envelope  restoration  , that  maintains  the  efficiency  , s/n   imd   is  about   35 dB .
 
The  Op structure allows for  up to  50% loss  of  signal   randomly  along the  time  line , ie  first 50% , last  50% or  randomly  distributed
 
Problem with  short burst is the  'average energy' level  , like a  radar  , huge KW peak  powers  but  only  watts  average power .....and  yes  , wide  bandwidth .
 
Detecting  a carrier  is one thing  .. to  recover  data is a much  more difficult  thing and requires  a higher  level of energy
 
G..
 

 
 Virendatenbank: 2437/5264 - Ausgabedatum: 12.09.2012
--------------010609060506000801070700--