Return-Path: Received: from mtain-de05.r1000.mx.aol.com (mtain-de05.r1000.mx.aol.com [172.29.64.205]) by air-mb02.mail.aol.com (v129.4) with ESMTP id MAILINMB021-a18f4c580eb5196; Tue, 03 Aug 2010 08:42:30 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-de05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2872238000084; Tue, 3 Aug 2010 08:42:28 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OgGnc-0000EF-5x for rs_out_1@blacksheep.org; Tue, 03 Aug 2010 13:40:52 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OgGnb-0000E5-9d for rsgb_lf_group@blacksheep.org; Tue, 03 Aug 2010 13:40:51 +0100 Received: from web86702.mail.ird.yahoo.com ([217.146.188.143]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OgGna-0007jE-GI for rsgb_lf_group@blacksheep.org; Tue, 03 Aug 2010 13:40:51 +0100 Received: (qmail 4688 invoked by uid 60001); 3 Aug 2010 12:40:44 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024; t=1280839244; bh=SrpwC7Mj3BaV301Abk0YX8vXjC0S28WhUjzYeIiPFIs=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=No5083ZvMJOaZKmB3Zs4gC1iTt9yjjDIdw8eVUoKmLbW4zd9PPlIcrQwRnOHtd4bZz5Voi6ErbMUqHp4tsd/nVZwQvR6Ly2kLt3Jhw23oqf330VuHXU8qhaM/5MiJ1si/UXL3+J9rDKcsOWr+qWDw0gb0JL1R1Nq3Pgcgn+48l8= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=AhjLSebmmxQbn11S4nVbTjgdANc4TVPqyFw9jTwe94xmqmdgqtn7310iH8mRjIBq7rWViGs3mbuScm53F9VXfN1dO242z0hceDSBCgqiD1lV48346l7U6NLB7PK5haNqUI/zy0BoQ9yq7AlKNsYRfj4fki7xmVEXvQ0eDO8mYvE=; Message-ID: <54047.1410.qm@web86702.mail.ird.yahoo.com> X-YMail-OSG: x_YSfXkVM1l10AbeQXLwNEQkUt29gHLzyMWYMGmnfpA6Sf7 7ujEbi5AKuLKhfhpLFF1JGX7Iajcx3RwtptV6QVFT._af3XQR.TlL3z9UMo. S_iXWuIK4dsqcJ5fwP4WExJbGZpC8mzII5uzNhXlHLsX0y087dpBt73Bht6h 11mYBBZDT9IqQtbO4wT7niD4swXupyfxGYojeZgS3MNj3wZM6jpdhX8pL_AK ZgTUB8UhkFjFlGdYH7wcxRoKZK3PD7.yhyZr8Umu6AkvrDoLMmY4kpF7xMOK d4G7r6EvrCTYA.4LW Received: from [81.159.193.181] by web86702.mail.ird.yahoo.com via HTTP; Tue, 03 Aug 2010 12:40:43 GMT X-Mailer: YahooMailRC/420.4 YahooMailWebService/0.8.105.279950 References: ,<359364.83864.qm@web86701.mail.ird.yahoo.com> Date: Tue, 3 Aug 2010 12:40:43 +0000 (GMT) From: Dave Pick To: rsgb_lf_group@blacksheep.org In-Reply-To: MIME-Version: 1.0 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Noise R75 - rs232 from smpsu - Content-Type: multipart/alternative; boundary="0-577381158-1280839243=:1410" 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_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-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d291.2 ; domain : btinternet.com DKIM : pass x-aol-sid: 3039ac1d40cd4c580eb44ac7 X-AOL-IP: 193.82.116.20 --0-577381158-1280839243=:1410 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Laurence Well the input side was a surplus IEC filtered inlet I got at a rally, I= usually=20 buy them if I see them. Even though it probably isn't characterised for LF= I=20 guess that in conjunction with the PSU's internal filter it must be pretty= =20 effective. The short length of mains lead inside the metal box is wrapped= round=20 a toroid a few times before entering the PSU. On the DC output side I used a pair of 3A 500uH chokes I got from RS, one= in=20 each side of the power supply, and decoupled the outgoing side to the box-= earth=20 with 100nF poly Cs. The DC then exits the box through a pair of feed-throu= gh=20 caps just to gild the lilly a bit. I don't know what all this does for De= ll's=20 PSU identifying system.... but it certainly shuts it up! 73 Dave. ________________________________ From: Laurence KL7UK To: rsgb_lf_group@blacksheep.org Sent: Tuesday, 3 August, 2010 3:38:12 Subject: RE: LF: Noise R75 - rs232 from smpsu - Dave - can you enlighten me on the filter values both on the X and Y caps= and=20 inductance AC side and filtering on the DC? I have about 5 bricks here;= some I=20 picked up in a market in Beijing (Beijing Lu akin to the old Lyle st in lo= ndon=20 (dont think you spell it like that - that dates me)) - Ive taken a couple= apart=20 and I have some that are 2 wire AC and some 3 wire - all appear to have pr= etty=20 good filtering and various screening materials even the Chinese cheapies.= Any=20 values to knock off 137 especially welcome - of course each psu has a slig= htly=20 different osc/pulse freq - some at 60 some at 300Khz! The opto isolator re= ally=20 helped the AK rx with good/reasonable signals from Japan every nite so far= ... =20 Im running out of good Oklahoman LF projects! =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 - =20 Laurence In my remote station I put the Dell brick in an Eddy box (die-cast box) wi= th a=20 proper mains filter on the input and chokes and feed-through capacitors in= the=20 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=20 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>=20 - the noise coming up from the SMPSU/processor from the old Dell puter -= cable=20 is double screened - choking off using J (75) type has seen little improve= ment -=20 this is my last hurdle to unimpeded remote rx on 137 - any pointers apprec= iated=20 - everythings bonded and Ive tried the on/off earth tricks at various loca= tions=20 -=20 =20 Anyone had any success of powering a Dell D series from a non standard non= =20 switched PSU? (the noise goes away when the DC from the Black Dell brick= is=20 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= =20 Hotmail. Get busy. --0-577381158-1280839243=:1410 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Laurence

Well the input side was a surplus IEC= filtered inlet I got at a rally, I usually buy them if I see them. Even= though it probably isn't characterised for LF I guess that in conjunction= with the PSU's internal filter it must be pretty effective. The short len= gth of mains lead inside the metal box is wrapped round a toroid a few tim= es before entering the PSU.
On the DC output side I used a pair of 3A= 500uH chokes I got from RS, one in each side of the power supply, and dec= oupled the outgoing side to the box-earth with 100nF poly Cs. The DC then= exits the box through a pair of feed-through caps just to gild the lilly= a bit.  I don't know what all this does for Dell's PSU identifying= system.... but it certainly shuts it up!

73
Dave.

From: Laurence KL7UK <hello= zerohellozero@hotmail.com>
To:= rsgb_lf_group@blacksheep.org
Sent: Tuesday, 3 August, 2010 3:38:12
Subject: RE: LF: Noise R75 - rs232 from= smpsu -

Dave - can you enlighten me on the filter values both on the X= and Y caps and inductance AC side and filtering on the DC?  I have= about 5 bricks here; some I picked up in a market in Beijing (Beijin= g Lu akin to the old Lyle st in london (dont think you spell it= like that - that dates me)) - Ive taken a couple apart and I have some th= at are 2 wire AC and some 3 wire - all appear to have pretty good fil= tering and various screening materials even the Chinese cheapies. Any valu= es to knock off 137 especially welcome - of course each psu has a slightly= different osc/pulse freq - some at 60 some at 300Khz! The opto isola= tor really helped the AK rx with good/reasonable signals from Japan= every nite so far...
 
Im running out of good Oklahoman LF projects!
 
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 -

=20
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 <= hellozerohellozero@hotmail.com>
Sent: Friday, 23 July, 201= 0 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.
=
--0-577381158-1280839243=:1410--