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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: Deutsche Welle ! From: Stefan Schäfer Sent: Wednesday, September 12, 2012 5:57 PM To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Fw: LOST TRACK ... 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: (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 [80.12.242.68 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: fcf77e2759cb043d8839e008dc214d5a Subject: Re: LF: Fw: LOST TRACK Content-Type: multipart/alternative; boundary="----=_NextPart_000_0057_01CD9113.B437E2E0" 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_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1da6085050c5431cd3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0057_01CD9113.B437E2E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Deutsche Welle ! From: Stefan Sch=E4fer=20 Sent: Wednesday, September 12, 2012 5:57 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Fw: LOST TRACK ... 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...=20 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:=20 Jim M0BMU =20 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 .... ?=20 G.. =20 PS :: I vote for Jims design ! =20 From: Clemens Paul=20 Sent: Wednesday, September 12, 2012 5:31 PM To: rsgb_lf_group@blacksheep.org=20 Cc: rsgb_lf_group@yahoogroups.co.uk=20 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 .=20 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?).=20 73 Clemens DL4RAJ ----- Original Message -----=20 From: Graham=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, September 12, 2012 5:17 PM Subject: Re: LF: Fw: LOST TRACK Mal, Things have moved on a bit=20 You can use a class E/D amp in linear , with envelope = restoration , that maintains the efficiency , s/n imd is about = 35 dB .=20 The Op structure allows for up to 50% loss of signal randomly = along the time line , ie first 50% , last 50% or randomly = distributed=20 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=20 G.. =20 Virendatenbank: 2437/5264 - Ausgabedatum: 12.09.2012 ------=_NextPart_000_0057_01CD9113.B437E2E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
  Deutsche = Welle   !

From: Stefan = Sch=E4fer
Sent: Wednesday, September 12, 2012 5:57 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: Fw: LOST TRACK

... i'm on the way to built such a modulator too. = Schemtic is=20 ready (draft) and parts have been ordered today! For 400W it may be easy = but...=20
Another part of that new power supply will be a CCM PFC using a = IR1150...=20 Interesting stuff!

73, Stefan

Am 12.09.2012 18:44, schrieb = Graham:=20
Jim M0BMU  
 
Published  a  design  and  made a = working =20 system  ........  he  also  eliminated the =20 need  for  a complicated   drive  by = using =20 complimentary   out put  devices  ... I don't = know =20 who else  made such a thing .... ?
 
G.. 
 
PS ::  I vote  for  Jims =20 design   ! 

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   =20 amp  in linear , with  envelope  restoration  , = that =20 maintains  the  efficiency  , s/n  =20 >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=20 CQ-DL 4/2001.
It's still in service.
I have the article as pdf  (in German) and can send it = to=20 anyone interested in building such
a PA which is not an easy task.Therefore,as far as I = know, only=20 two such PAs have been built.
One by DJ7AW and one in South America (Joe?). 
 
 
73
Clemens
DL4RAJ
-----=20 Original Message ----- From:=20 Graham To:=20 rsgb_lf_group@blacksheep.org Sent:=20 Wednesday, September 12, 2012 5:17 PM Subject:=20 Re: LF: Fw: LOST TRACK

Mal,
 
Things  have  moved on a bit
 
You  can  use a  class  = E/D   =20 amp  in linear , with  envelope  restoration  ,=20 that  maintains  the  efficiency  , = s/n  =20 imd   is  about   35 dB .
 
The  Op structure allows for  up to  50% = loss =20 of  signal   randomly  along the  = time  line ,=20 ie  first 50% , last  50% or  randomly  = distributed=20
 
Problem with  short burst is the  'average energy'=20 level  , like a  radar  , huge KW peak  = powers =20 but  only  watts  average power .....and  = yes  ,=20 wide  bandwidth .
 
Detecting  a carrier  is one thing  .. to =20 recover  data is a much  more difficult  thing and=20 requires  a higher  level of energy
 
G..
 

 
 Virendatenbank: 2437/5264 - Ausgabedatum: 12.09.2012=20
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