Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,FORGED_HOTMAIL_RCVD, HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id s9E0Jhbl018268 for ; Tue, 14 Oct 2014 02:19:43 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XdpmF-000408-GG for rs_out_1@blacksheep.org; Tue, 14 Oct 2014 01:15:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XdpmE-0003zz-W0 for rsgb_lf_group@blacksheep.org; Tue, 14 Oct 2014 01:15:46 +0100 Received: from blu004-omc1s29.hotmail.com ([65.55.116.40]) by relay1.thorcom.net with esmtps (TLSv1.2:AES256-SHA256:256) (Exim 4.82) (envelope-from ) id 1XdpmC-0007AT-C7 for rsgb_lf_group@blacksheep.org; Tue, 14 Oct 2014 01:15:45 +0100 Received: from BLU177-W28 ([65.55.116.8]) by BLU004-OMC1S29.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22751); Mon, 13 Oct 2014 17:15:42 -0700 X-TMN: [1w7nBuyAJMRSG9emW+BvpxXPZK/c+Qgx] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: Laurence KL7 L To: "rsgb_lf_group@blacksheep.org" Date: Mon, 13 Oct 2014 16:15:41 -0800 Importance: Normal In-Reply-To: <00a801cfe4f7$936c7f50$4201a8c0@yourc44d19af4e> References: <003a01cfe4b7$7706b4b0$4201a8c0@yourc44d19af4e> ,<005201cfe4c0$e985af60$4201a8c0@yourc44d19af4e> ,<00a801cfe4f7$936c7f50$4201a8c0@yourc44d19af4e> MIME-Version: 1.0 X-OriginalArrivalTime: 14 Oct 2014 00:15:42.0547 (UTC) FILETIME=[FDE48230:01CFE743] X-Scan-Signature: 3df6620ae1cf83b986cf2fc02407da16 Content-Type: multipart/alternative; boundary="_2d1d54fb-7ca6-406d-b435-a62901473289_" Subject: LF: Alternatives Re: STW34NB20 - used in a number of MF and LF PA designs 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: RO X-Status: X-Keywords: X-UID: 768 --_2d1d54fb-7ca6-406d-b435-a62901473289_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Alan/Jack/Stefan/Steve and all - thanks for the feedback=2C and as describe= d its all a matter of compromise but the new vertical structure FET Mesh d= esigns seem to be reasonable with similar the lower R on ohm figures of the= older devices - rise and fall times/input cap and gate charge all look doo= able - just the dollar amount... =20 Just for info - Ive taken the plunge and ordered=20 =20 STW70N60M2 600V VDs 0.031 Ohm on and Imax as 68A - Ill let you know how = they work in cct but it looks like completely over the top Gold over engine= ered FET device but I need the insurance give the changes and sudden animal= interventions/weather I get up here in Alaska -=20 =20 http://www.mouser.com/ProductDetail/STMicroelectronics/STW70N60M2/?qs=3DRlw= i1sSxVL4hmaII3E%2FvIA%3D%3D =20 I temp switched over to a 600V FET=2C the end of life or about to be http:= //www.mouser.com/ProductDetail/STMicroelectronics/STW16N65M5/?qs=3DsGAEpiMZ= ZMutXGli8Ay4kNbVQor0Njej2JFFy%252bQzHzg%3d =20 this is a "smaller" I tot device and gets a little warmer than more lower R= on ohms 34NB20 but was running fine in 1Kw W1VD design with no change in ta= p points out optimizing the Voltage/Current ratios.... I have a pair of the= m at 300W out and effieciency was about 72% or so. I didnt see any peaky wa= veform on the drains either.. =20 All being well Ill be on WSPR2 630m tonight - weather up here is far too wa= rm - lake ice has melted and the ducks and Swans are back enroute South =20 Laurence KL7L =20 =20 =20 From: jwaskew@telus.net To: rsgb_lf_group@blacksheep.org Date: Fri=2C 10 Oct 2014 19:03:39 -0700 Subject: LF: Re: : Re: STW34NB20 - used in a number of MF and LF PA designs =0A= =0A= =0A= =0A= =0A= =0A= =0A= Hi Laurence=0A= There is no easy answer to that problem. If =0A= there were some way you could reduce the time it takes to shut down the fin= al =0A= using a faster circuit=2C it would reduce the chance of smoked FETs =0A= obviously. I guess it's the high winds that really cause the biggest =0A= problem there. The close proximity of our trees here limit me from leaving = the =0A= amp unattended during winds.=0A= =0A= = --_2d1d54fb-7ca6-406d-b435-a62901473289_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Alan/Jack/Stefan/Steve and all -= thanks for the feedback=2C and as described its all a matter of compromise= but the new vertical structure =3B FET Mesh designs seem to be reasona= ble with similar the lower R on ohm figures of the older devices - rise and= fall times/input cap and gate charge all look dooable - just the dollar am= ount...
 =3B
Just for info - Ive taken the plunge and ordered  =3B
STW70N60M2 =3B 6= 00V VDs =3B 0.031 Ohm on and Imax as =3B68A =3B - Ill let you k= now how they work in cct but it looks like completely over the top Gold ove= r engineered FET device but I need the insurance give the changes and sudde= n animal interventions/weather I get up here in Alaska -
 =3B
http://www.mou= ser.com/ProductDetail/STMicroelectronics/STW70N60M2/?qs=3DRlwi1sSxVL4hmaII3= E%2FvIA%3D%3D
 =3B
I =3B temp swit= ched over to a 600V FET=2C the end of life or about to be http://www.mouser.com/ProductDet= ail/STMicroelectronics/STW16N65M5/?qs=3DsGAEpiMZZMutXGli8Ay4kNbVQor0Njej2JF= Fy%252bQzHzg%3d
 =3B
this is a "smal= ler" I tot device and gets a little warmer than more lower Ron ohms 34NB20 = but was running fine in 1Kw W1VD design with no change in tap points out op= timizing the Voltage/Current ratios.... I have a pair of them at 300W out a= nd effieciency was about 72% or so. I didnt see any peaky waveform on the d= rains either..
&= nbsp=3B
All being well Ill be = on WSPR2 630m tonight - weather up here is far too warm - lake ice has melt= ed =3B and the ducks and Swans are back enroute South
 =3B
Laurence KL7L
 =3B
 =3B

 =3B
From: jwaskew= @telus.net
To: rsgb_lf_group@blacksheep.org
Date: Fri=2C 10 Oct 2014 = 19:03:39 -0700
Subject: LF: Re: : Re: STW34NB20 - used in a number of MF= and LF PA designs

=0A= =0A= =0A= =0A= =0A= =0A= =0A=
Hi Laurence
=0A=
There is no easy answer to that proble= m. =3B If =0A= there were some way you could reduce the time it takes to shut down the fin= al =0A= using a faster circuit=2C it would =3Breduce the chance of smoked FETs = =0A= obviously. =3B I guess it's the high winds that really cause the bigges= t =0A= problem there. The close proximity of our trees here limit me from leaving = the =0A= amp unattended during winds.
=0A=
 =3B
=0A=
 =3B
= --_2d1d54fb-7ca6-406d-b435-a62901473289_--