Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-md03.r1000.mx.aol.com (Internet Inbound) with ESMTP id B28BD38000089; Sat, 28 Jan 2012 08:24:48 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Rr8GH-0007LE-VI for rs_out_1@blacksheep.org; Sat, 28 Jan 2012 13:24:09 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Rr8GG-0007Kw-UW for rsgb_lf_group@blacksheep.org; Sat, 28 Jan 2012 13:24:08 +0000 Received: from nm9.bullet.mail.ird.yahoo.com ([77.238.189.35]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1Rr8GG-0004J0-Pg for rsgb_lf_group@blacksheep.org; Sat, 28 Jan 2012 13:24:08 +0000 Received: from [77.238.189.49] by nm9.bullet.mail.ird.yahoo.com with NNFMP; 28 Jan 2012 13:24:03 -0000 Received: from [212.82.108.247] by tm2.bullet.mail.ird.yahoo.com with NNFMP; 28 Jan 2012 13:24:03 -0000 Received: from [127.0.0.1] by omp1012.mail.ird.yahoo.com with NNFMP; 28 Jan 2012 13:24:03 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 125163.32504.bm@omp1012.mail.ird.yahoo.com Received: (qmail 93467 invoked by uid 60001); 28 Jan 2012 13:24:03 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1327757043; bh=oTIQ5uSKl1Ed9PL1Uc86cIJVnwuty40nVW6loNc0l0w=; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=vUgkt83J4zoMg1SpKoUSPS4SM7iHr1n1h8fJh1qoPeS7UnEvnuzUawZvtJrQ7sxsmTFISk27+bHR8beunjxcCfvZVdfLEX67noCVgWNoAgf4p09fTcKefMUCTlBW6L8UFBQNgtWLfnUowOS7aYpPnGu20ll7a8z87Kvb7MKFu+4= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=pU/iJ0vlnS29IvNMz7JG/9K4Gw9oDlaTiFJLrIMWb4BM0zEpWAADhS0+6cXcoehcRNg0jzmxMago3rkcVbQ0mnIw9u55KPbAdxjDvXlmBK2Xb0bFeshJBnsA1ntLakb1/u8Xq+UL6wrBWtQEV/31AjAruWLOtihAxCShUKswBTA=; X-YMail-OSG: IUpUNkwVM1lG5s1_hTo9rgdNUVaUukqQneBrhd6ZSYd_FCZ qqXM7Mp0VsSBKdKWWcx1g8Tu0U.4EVRunQ_dmu4Vdfim1t9tlkXo.feTQWsI VkyUhZc63hUCqX5KJOmh5XdbmZxipR4LA26Ip4oAPMqLt7chnDuMOslC_c7K D0TAgITx1eaZOdkxq8myXksux8Xa8i3qHAM_ShF0Pysljx9ryMZwx.usJSd8 vexzEGHoRzdq2yWVKe_0_0vfXBmARbGvbF47KIQo4Of.Na53C.RVfvbV_5.Q KP359CDcSMUR0t8npDHYv8._oLACxnwuINpSr9NZp5KfMibg2u9x6sYMhpDM VlTdLOpAGPVw_VbE44rmevFcFARGrIwRvtHXr1YexRZoqir41Pt6cv_xS63o lsrtQapAEBUXfdVmfo2zb8_ruMoXWb3y8u6GAgbXCjUQZcwkR5oZMAfWUrx_ QH2oym.VgJQZQJu_Iop2mMGoqPTb.XtiLGz2cczJPEsRSLQv_nkCU_UC1p9r PBUwOZgtm9bjI4yHTOmx895mQANeg9O3kMU8B24eMt5wyhoU4sLT6gcTNHGG LGsySVx4CP2EI6hfwrnPy8Juko28ItF9DRAJ_wRH4c5_HApqsr.7.nJj09Ex HvaQUBUtZ5Qa.T_0fnNUKbSMaw_3rnqcZZv0Pj1_b5crIyKmm3y66q6.343b E5oNzaRB5PTs6r6vQsEsf7ABbW9iZjAB.v26p36hNyfnkMgtnSr2zF6up00z qIJzs8j9g Received: from [86.146.28.160] by web171604.mail.ir2.yahoo.com via HTTP; Sat, 28 Jan 2012 13:24:02 GMT X-Mailer: YahooMailWebService/0.8.116.331537 References: <006501ccddb0$d757cd60$0401a8c0@xphd97xgq27nyf> Message-ID: <1327757042.92926.YahooMailNeo@web171604.mail.ir2.yahoo.com> Date: Sat, 28 Jan 2012 13:24:02 +0000 (GMT) From: M0FMT To: "rsgb_lf_group@blacksheep.org" MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: Re: OT: Headphones Content-Type: multipart/alternative; boundary="435439028-823673181-1327757042=:92926" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_50_60, HTML_FONTCOLOR_UNSAFE,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: 0:2:446479904:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d014.2 ; domain : yahoo.co.uk DKIM : fail x-aol-sid: 3039ac1d60574f23f72065da X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --435439028-823673181-1327757042=:92926 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Try these Roger.=0A=A0=0Ahttp://xtalman.com/headsets.html=0A=A0=0A4400 ohm = imp.=0A=A0=0AOr build an audio amplifier ?=0A=A0=0A73 es GL Pete M0FMT IO91= UX=0A=A0 =0AFrom: mal hamilton =0ATo: rsgb_lf_group@= blacksheep.org =0ASent: Saturday, 28 January 2012, 11:34=0ASubject: LF: Re:= OT: Headphones=0A=0A=0ARoger=0AThe DLR5 is nothing special the Z is only a= round 50 ohms whereas S G Brown and similar are 2000Z. Plenty of old headph= ones still about=0Ag3kev=0A=0A----- Original Message ----- =0A>From: Roger = Lapthorn =0A>To: rsgb_lf_group@blacksheep.org =0A>Sent: Friday, January 27,= 2012 10:29 PM=0A>Subject: LF: OT: Headphones=0A>=0A>Slightly OT but people= like Mal and Jim may have an answer. =0A>=0A>Is there a "modern" (i.e. can= you buy it new today?) headphone set that is extremely sensitive in the sa= me way that the old DLR5 headsets were in terms of efficiency converting AF= to sound pressure in the ear?=A0 =0A>=0A>I believe Jim M0BMU claimed 2uV a= udio power could be heard using DLR5 headsets in his passive mechanical SAQ= receiver. As DLR5s are more difficult to find these days I was wondering i= f there is anything as sensitive, or more so, around "new".=0A>=0A>73s=0A>R= oger G3XBM=0A>=0A>-- =0A>http://qss2.blogspot.com/=0A>http://g3xbm-qrp.blog= spot.com/=0A>http://www.g3xbm.co.uk=0A>https://sites.google.com/site/sub9kh= z/=0A>=0A>=0A> --435439028-823673181-1327757042=:92926 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Try these Roger.
 
http://xtalman.com/headsets.html<= /DIV>
 
4400 ohm imp.
 
Or build an audio amplifier ?
 
73 es GL Pete M0FMT IO9= 1UX
 =20
From: m= al hamilton <g3kevmal@talktalk.net>
To: rsgb_lf_group@blacksheep.org
Sent: Saturday, 28 January 2012, 11:34
Subject: LF: Re: OT: Headphones<= BR>

Roger
The DLR5 is nothing special the Z is only around 50= ohms whereas S G Brown and similar are 2000Z. Plenty of old headphones sti= ll about
g3kev
 
----- Original Message -----
From: Roger Lapthorn
To: rsgb_lf_group@bl= acksheep.org
Sent: Friday, January 27, 2012 10:= 29 PM
Subject: LF: OT: Headphones

Slightly OT but people like Mal and Jim may have an answer. =

Is there a "modern" (i.e. can you buy it new today?) headphone set = that is extremely sensitive in the same way that the old DLR5 headse= ts were in terms of efficiency converting AF to sound pressure in the ear?&= nbsp;

I believe Jim M0BMU claimed 2uV audio power could be heard us= ing DLR5 headsets in his passive mechanical SAQ receiver. As DLR5s are more= difficult to find these days I was wondering if there is anything as sensi= tive, or more so, around "new".

73s
Roger G3XBM
--
http://qss2.blogspot.= com/
http://g3xbm-qrp.blogspot.com/<= /FONT>
http://www.g3xbm.co.uk
https://sites.google.= com/site/sub9khz/




--435439028-823673181-1327757042=:92926--