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=2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_MUA_OUTLOOK,HTML_40_50,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 t9ONvwOZ016259 for ; Sun, 25 Oct 2015 01:57:58 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zq8dm-0000Fa-Sp for rs_out_1@blacksheep.org; Sun, 25 Oct 2015 00:54:26 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zq8dm-0000FL-A5 for rsgb_lf_group@blacksheep.org; Sun, 25 Oct 2015 00:54:26 +0100 Received: from rgout0305.bt.lon5.cpcloud.co.uk ([65.20.0.211]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1Zq8ci-0006GF-4R for rsgb_lf_group@blacksheep.org; Sun, 25 Oct 2015 00:54:25 +0100 X-OWM-Source-IP: 86.149.134.195 (GB) X-OWM-Env-Sender: alan.melia@btinternet.com X-CTCH-RefID: str=0001.0A010202.562C19DF.0036,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0 X-Junkmail-Premium-Raw: score=38/50,refid=2.7.2:2015.10.14.50616:17:38.343,ip=86.149.134.195,rules=__HAS_MSGID, __SANE_MSGID, MSGID_32HEX_LC, INVALID_MSGID_NO_FQDN, __MSGID_32HEX, __HAS_FROM, __PHISH_FROM2, __FRAUD_WEBMAIL_FROM, __TO_MALFORMED_2, __TO_NO_NAME, __REFERENCES, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __SUBJ_ALPHA_END, __MIME_VERSION, __CT, __CTYPE_MULTIPART_ALT, __CTYPE_HAS_BOUNDARY, __CTYPE_MULTIPART, __HAS_X_PRIORITY, __HAS_MSMAIL_PRI, __HAS_X_MAILER, USER_AGENT_OE, __OUTLOOK_MUA_1, __USER_AGENT_MS_GENERIC, __ANY_URI, LINK_TO_IMAGE, __FRAUD_BODY_WEBMAIL, __URI_NO_WWW, __CP_MEDIA_BODY, __CP_URI_IN_BODY, __C230066_P2, __SUBJ_ALPHA_NEGATE, SUPERLONG_LINE, __URI_IN_BODY, __HTML_AHREF_TAG, __HAS_HTML, BODY_SIZE_10000_PLUS, BODYTEXTH_SIZE_10000_LESS, __MIME_HTML, __TAG_EXISTS_HTML, __STYLE_RATWARE_NEG, RDNS_GENERIC_POOLED, __URI_NS, SXL_IP_DYNAMIC[195.134.149.86.fur], RDNS_SUSP_GENERIC, __PHISH_FROM, __OUTLOOK_MUA, RDNS_SUSP, __FRAUD_WEBMAIL, FORGED_MUA_OUTLOOK, REFERENCES, NO_URI_HTTPS X-CTCH-Spam: Unknown Received: from gnat (86.149.134.195) by rgout03.bt.lon5.cpcloud.co.uk (8.6.122.06) (authenticated as alan.melia@btinternet.com) id 561CA20101608799 for rsgb_lf_group@blacksheep.org; Sun, 25 Oct 2015 00:53:03 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btcpcloud; t=1445730800; bh=31JAM/jobnQ/pk1WQm9uOQ2aHEieRnygQaS3enw4hoM=; h=Message-ID:From:To:References:Subject:Date:MIME-Version:X-Mailer; b=oAqixfpDn7xZpaqRzP0u/fyi0OLzD8lbBVfVM9OIXbLMraLoZvAp7xMNTo6kTYQMTya2MT5j2DXmhAc3aTVhvASl7mYFF/p1ClEHIVbnjsg42irYQOg4pGaR7pQTj0HGjTZnGWrIcddiIF47WYiLUYpAkFXF4L5k8eqdleDuOHQ= Message-ID: From: "Alan Melia" To: References: <8D2DCB586344FC2-FD8-744AA8@webmail-vd011.sysops.aol.com> <15F6C5D23D6C469B9FE6E3C21C6ABBD7@gnat> Date: Sun, 25 Oct 2015 00:52:52 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Scan-Signature: 9b15d9defc5ae6fa811529a4cbe8c306 Subject: Re: LF: XPQ WSPR15 475/136 and warm ceramic feed thrus Content-Type: multipart/alternative; boundary="----=_NextPart_000_012D_01D10EBF.7A3A7990" 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: O X-Status: X-Keywords: X-UID: 4637 This is a multi-part message in MIME format. ------=_NextPart_000_012D_01D10EBF.7A3A7990 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Well there is a cohort of noble men who have set fire to, window frames, = fences, sheds, tuning boxes etc with 136kHz RF over the years :-)) plus = minor infringments like rope guys, and waste-pipe spreaders .....I think = the badge should be the usual symbols of earth, coil, and aerial but = with a couple of small flames licking out of the bottom of the coil :-)) = Yeah well a bit of artistic licence maybe :-)) Alan G3NYK ----- Original Message -----=20 From: Laurence KL7 L=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Sunday, October 25, 2015 12:04 AM Subject: Re: LF: XPQ WSPR15 475/136 and warm ceramic feed thrus Thanks Alan - absolutely - and I should have read the tables! At the beginning of testing I ran the Tx at full throttle for a few = hours at 1.4Kw and measured the heating of components with an IR "laser" = and saw a few degrees in increase but little more than when I measured = in okie - obviously over time something odd happened! Its been running = virtually constant for about a week... Fire in the wire!=20 Im now going to come in thru a plated out plastic bulkhead as it ended = up last time and direct connect to the bus bars... Think telephone exchange with a little more kick! As ever its a learning curve :-) Cheers On Oct 24, 2015, at 14:50, Alan Melia = wrote: Hi Laurence my book gives Stainless Steel as 8 times resistivity of = Brass and 40 times that of pure copper so maybe you were pushing your = luck a bit, though I would have thought the connections at the ends = would be problem. It looks like arcing on the pic but its obviously = not..... the eramoc got so hot is just melted its way though the = plastic and it is cooked plastic on the outer surface. Also its not bulk = resistance at these freqs you have to consider skin effect in the SS. = Still interesting its only one insulator. It might be interesting to = look at it with a milliohm meter if you have such a beast. I would guess = you must have had the equivalent of 0.2 ohm or so to get that = hot....particularly in your climate :-)) Alan G3NYK ----- Original Message -----=20 From: Laurence KL7 L=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Saturday, October 24, 2015 11:05 PM Subject: RE: LF: XPQ WSPR15 475/136 and warm ceramic feed thrus Thanks Alan - th iono really hadnt cooled off up here from the = continuous heating over the past month or so but it was getting better = so I thought Id better inject a little more heat http://kl7l.com/coupler3.jpg The Stainless 5/16th bolt in the feedthru must have had some = imperfections in manufacture and got extremely hot at circa 50-60A :-) = it didnt happen to the other bolt and wasnt at the wire connection = points each side. I think Ive had it with feed thrus' at this current and are going = to come straight in thru a hole drilled in a hi density cutting board.=20 I recall the original brass feed thrus getting a little warm but = this must have got real warm - sufficient to say the Decca kept on = transmitting and didnt see a high SWR at all over the past week... The Walmart Rubbermaid box was (is) in its 12th year and Im just = going to plate over it... :-) Laurence KL7L WE2XPQ -------------------------------------------------------------------------= - From: alan.melia@btinternet.com To: rsgb_lf_group@blacksheep.org Date: Sat, 24 Oct 2015 22:42:47 +0100 Subject: Re: LF: XPQ WSPR15 475/136 Hi Markus, yes I think that has been happening, but in Laurence's = case the first post did not appear to any of us so that was probably = bounced on theway in, but I have seen cases were posts have been = reflected but not received by the sender. Some ISPs seem to regard a = message sent to self as spam.....I regularly dig out my LF postings from = my webmail spam folder. Marking them as "Not Spam" does not seem to = affect the rules in "Spamguard", the filter used. I reckon you are due for a few down days Laurence the CME from the = C5 on the 22nd arrived at 1900z. Spaceweather maked it as arriving = unexpectedly early.....I dont see that the interval was about 62 hours. = We only caught the "wash" as it was not pointing at Earth, and that = could account for some of the longer interval. Alan ------=_NextPart_000_012D_01D10EBF.7A3A7990 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Well there is a cohort of noble men who = have set=20 fire to, window frames, fences, sheds, tuning boxes etc with 136kHz = RF over=20 the years :-)) plus minor infringments like rope guys, and = waste-pipe=20 spreaders .....I think the badge should be the usual symbols of earth, = coil, and=20 aerial but with a couple of small flames licking out of the bottom of = the coil=20 :-))  Yeah well a bit of artistic licence maybe :-))
 
Alan
G3NYK
 
----- Original Message -----
From:=20 Laurence KL7 L =
Sent: Sunday, October 25, 2015 = 12:04=20 AM
Subject: Re: LF: XPQ WSPR15 = 475/136 and=20 warm ceramic feed thrus

Thanks Alan - absolutely - and I should have read the = tables!

 At the beginning of testing I ran the Tx at full throttle = for a few=20 hours at 1.4Kw and measured the heating of components with an IR = "laser" and=20 saw a few degrees in increase but little more than when I measured in = okie -=20 obviously over time something odd happened! Its been running virtually = constant for about a week...    Fire in the = wire! 

Im now going to come in thru a plated out plastic bulkhead as it = ended up=20 last time and direct connect to the bus bars...

Think telephone exchange with a little more kick!

As ever its a learning curve :-)


Cheers



On Oct 24, 2015, at 14:50, Alan Melia <alan.melia@btinternet.com&g= t;=20 wrote:

Hi Laurence my book gives Stainless = Steel as 8=20 times  resistivity of Brass and 40 times  that of pure = copper so=20 maybe you were pushing your luck a bit, though I would have thought = the=20 connections at the ends would be problem. It looks like arcing on = the pic=20 but its obviously not..... the eramoc got so hot is just melted = its =20 way though the plastic and it is cooked plastic on the outer = surface. Also=20 its not bulk resistance at these freqs you have to consider skin = effect in=20 the SS. Still interesting its only one insulator. It might be = interesting to=20 look at it with a milliohm meter if you have such a beast. I would = guess you=20 must have had the equivalent of 0.2 ohm or so to get that=20 hot....particularly in your climate :-))
 
Alan
G3NYK
----- Original Message ----- =
From:=20 Laurence KL7 L =
To: rsgb_lf_group@blacksheep.org= =20
Sent: Saturday, October 24, = 2015=20 11:05 PM
Subject: RE: LF: XPQ WSPR15 = 475/136=20 and warm ceramic feed thrus

Thanks Alan - th iono really hadnt cooled off up = here from=20 the continuous heating over the past month or so but it was = getting better=20 so I thought Id better inject a little more heat


The Stainless 5/16th bolt in the feedthru must have = had some=20 imperfections in manufacture and got extremely hot at circa 50-60A = :-) it=20 didnt happen to the other bolt and wasnt at the wire connection = points=20 each side.

 I think Ive had it with feed thrus' at this = current and=20 are going to come straight in thru a hole drilled in a hi density = cutting=20 board. 

I recall the original brass feed thrus getting a = little warm=20 but this must have got real warm - sufficient to say the Decca = kept on=20 transmitting and didnt see a high SWR at all over the past = week...

The Walmart Rubbermaid box was (is)  in its = 12th year=20 and Im just going to plate over it... :-)

Laurence KL7L WE2XPQ



From: alan.melia@btinternet.comTo:=20 rsgb_lf_group@blacksheep.org=
Date:=20 Sat, 24 Oct 2015 22:42:47 +0100
Subject: Re: LF: XPQ WSPR15=20 475/136

Hi Markus, yes I think that has = been=20 happening, but in Laurence's case the first post did not appear to = any of=20 us so that was probably bounced on theway in, but I have seen = cases were=20 posts have been reflected but not received by the sender. Some = ISPs seem=20 to regard a message sent to self as spam.....I regularly dig out = my LF=20 postings from my webmail spam folder. Marking them as "Not Spam" = does not=20 seem to affect the rules in "Spamguard", the filter = used.
 
I reckon you are due for a few = down days=20 Laurence the CME from the C5 on the 22nd arrived at 1900z. = Spaceweather=20 maked it as arriving unexpectedly early.....I dont see that the = interval=20 was about 62 hours. We only caught the "wash" as it was not = pointing at=20 Earth, and that could account for some of the longer=20 interval.
 
Alan
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