Return-Path: Received: from mtain-mi07.r1000.mx.aol.com (mtain-mi07.r1000.mail.aol.com [172.21.131.165]) by air-da07.mail.aol.com (v129.4) with ESMTP id MAILINDA074-86674c4a7f5c41; Sat, 24 Jul 2010 01:51:25 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mi07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1D9E5380000A3; Sat, 24 Jul 2010 01:51:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OcXcL-0001cf-AY for rs_out_1@blacksheep.org; Sat, 24 Jul 2010 06:49:49 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OcXcK-0001cW-IZ for rsgb_lf_group@blacksheep.org; Sat, 24 Jul 2010 06:49:48 +0100 Received: from blu0-omc1-s17.blu0.hotmail.com ([65.55.116.28]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OcXcJ-0004L5-Eh for rsgb_lf_group@blacksheep.org; Sat, 24 Jul 2010 06:49:48 +0100 Received: from BLU146-W32 ([65.55.116.9]) by blu0-omc1-s17.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Fri, 23 Jul 2010 22:49:39 -0700 Message-ID: X-Originating-IP: [72.35.100.203] From: Laurence KL7UK To: Date: Fri, 23 Jul 2010 21:49:39 -0800 Importance: Normal In-Reply-To: <359364.83864.qm@web86701.mail.ird.yahoo.com> References: ,<359364.83864.qm@web86701.mail.ird.yahoo.com> MIME-Version: 1.0 X-OriginalArrivalTime: 24 Jul 2010 05:49:39.0853 (UTC) FILETIME=[01AA83D0:01CB2AF4] X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Content-Type: multipart/alternative; boundary="_96001465-39fd-423d-8974-84f52a2d7645_" Subject: RE: LF: Noise R75 - rs232 from smpsu - 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=FORGED_HOTMAIL_RCVD,HTML_20_30, 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: 3039400cdecf4c4a7f5b7e02 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_96001465-39fd-423d-8974-84f52a2d7645_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Chaps - thanks for the all the advice - more to chew on - =20 Dave common mode chokes do a bit but I need more - the S meter on the main= T array sits at S3 or so mostly non man made which is the best Ive had so= far s/n wise but the dang noise adds a few dB (Im being really pe-nickity= ) - opto, Eddy boxes and more playing is needed - seems noise from the PSU= getting onto the data lines mostly common I think - opto is my best bet. =20 Cheers for the advice again on direct and indirect emails - =20 running the main "T" (actually an offset X and Y bottom loaded 50 ft verti= cal on 137 khz and really pleased - =20 grabber running on http://kl1x.com/alaska.html =20 =20 the slightest sniff of dcf39...not bad for July... =20 Laurence =20 Date: Fri, 23 Jul 2010 22:26:06 +0000 From: davepick@btinternet.com To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Noise R75 - rs232 from smpsu - Laurence In my remote station I put the Dell brick in an Eddy box (die-cast box) wi= th a proper mains filter on the input and chokes and feed-through capacito= rs in the DC output lead. Drilled some holes for ventilation. Quiet as a= mouse. A linear PSU should also be fine but quite large. The RS232 is unbalanced of course, but if you run it in screened cable and= use a ferrite common-mode choke dies it not help? Dave G3YXM From: Laurence KL7UK To: lowfer@mailman.qth.net; rsgb_lf_group@blacksheep.org Sent: Friday, 23 July, 2010 21:47:56 Subject: LF: Noise R75 - rs232 from smpsu - =20 Anyone done any common mode noise mitigation from the RS232 port of the R7= 5 Rx> - the noise coming up from the SMPSU/processor from the old Dell put= er - cable is double screened - choking off using J (75) type has seen lit= tle improvement - this is my last hurdle to unimpeded remote rx on 137 -= any pointers appreciated - everythings bonded and Ive tried the on/off ea= rth tricks at various locations -=20 =20 Anyone had any success of powering a Dell D series from a non standard non= switched PSU? (the noise goes away when the DC from the Black Dell brick= is removed but it may also be partially screen/processor noise...) =20 with thanks =20 Laurence Kl7UK The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with= Hotmail. Get busy. =20 _________________________________________________________________ Hotmail is redefining busy with tools for the New Busy. Get more from your= inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=3DPID28326::T:WLMTAGL:= ON:WL:en-US:WM_HMP:042010_2=3D --_96001465-39fd-423d-8974-84f52a2d7645_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Chaps - thanks for the all the advice - more to chew on -
 
Dave common mode chokes do a bit but I need more - the S meter on the = ;main T array sits at S3 or so mostly non man made which is=  the best Ive had so far s/n wise but the dang noise adds a few dB (I= m being really pe-nickity) - opto, Eddy boxes and more playing is needed= - seems noise from the PSU getting onto the data lines mostly common I th= ink  - opto is my best bet.
 
Cheers for the advice again on direct and indirect emails -
 
running the main "T" (actually an offset X and Y bottom loaded 50 ft verti= cal on 137 khz and really pleased -
 
grabber running on http://kl1x.com= /alaska.html  
 
the slightest sniff of dcf39...not bad for July...
 
Laurence
 
Date: Fri, 23 Jul 2010 22:26:06 +0000
From: davepick@btinternet.com
= To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Noise R75 - rs232 fro= m smpsu -

Laurence

In my remote station I put the Dell brick in an Eddy= box (die-cast box) with a proper mains filter on the input and chokes and= feed-through capacitors in the DC output lead. Drilled some holes for ven= tilation. Quiet as a mouse.
A linear PSU should also be fine but quite= large.
The RS232 is unbalanced of course, but if you run it in screene= d cable and use a ferrite common-mode choke dies it not help?

Dave= G3YXM

From: Laurence KL7UK <h= ellozerohellozero@hotmail.com>
= To: lowfer@mailman.qth.net; rsgb_lf_group@blacksheep.org
= Sent: Friday, 23 July, 2010= 21:47:56
Subject: LF:= Noise R75 - rs232 from smpsu -

 
Anyone done any common mode noise mitigation from the RS232 port= of the R75 Rx> - the noise coming up from the SMPSU/processor from the= old Dell puter - cable is double screened - choking off using J (75)= type has seen little improvement - this is my last hurdle to unimpeded re= mote rx on 137 - any pointers appreciated - everythings bonded and Ive tri= ed the on/off earth tricks at various locations -
 
Anyone had= any success of powering a Dell D series from a non standard non switched= PSU? (the noise goes away when the DC from the Black Dell brick is remove= d but it may also be partially screen/processor noise...)
 
wit= h thanks
 
Laurence Kl7UK

The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with= Hotmail. Get busy.
Hotmail is redefining busy with tools for the New Busy. Get more= from your inbox. = See how. =3D --_96001465-39fd-423d-8974-84f52a2d7645_--