Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, HTML_MESSAGE,SPF_PASS,T_DKIM_INVALID,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: wuwien: mailn 1290; Body=3 Fuz1=3 Fuz2=3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v7FJpRJl022667 for ; Tue, 15 Aug 2017 21:51:28 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dhhnH-0005rM-PT for rs_out_1@blacksheep.org; Tue, 15 Aug 2017 20:46:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dhhnH-0005rD-0f for rsgb_lf_group@blacksheep.org; Tue, 15 Aug 2017 20:46:27 +0100 Received: from rgout0302.bt.lon5.cpcloud.co.uk ([65.20.0.208] helo=rgout03.bt.lon5.cpcloud.co.uk) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1dhhnD-0003Mi-VR for rsgb_lf_group@blacksheep.org; Tue, 15 Aug 2017 20:46:25 +0100 X-OWM-Source-IP: 86.185.176.70 (GB) X-OWM-Env-Sender: alan.melia@btinternet.com X-Junkmail-Premium-Raw: score=13/50,refid=2.7.2:2017.8.15.191816:17:13.296,ip=,rules=__HAS_MSGID, __SANE_MSGID, MSGID_32HEX_LC, INVALID_MSGID_NO_FQDN, __MSGID_32HEX, __HAS_FROM, __FRAUD_WEBMAIL_FROM, __TO_MALFORMED_2, __TO_NO_NAME, __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, __MIME_TEXT_P2, __MIME_TEXT_H2, __ANY_URI, __URI_NO_WWW, __FRAUD_MONEY_BIG_COIN_DIG, __SUBJ_ALPHA_NEGATE, SUPERLONG_LINE, __HTML_AHREF_TAG, __STYLE_RATWARE_NEG, __URI_WITHOUT_PATH, __STYLE_TAG, __HAS_HTML, __HTML_TAG_DIV, HTML_NO_HTTP, BODYTEXTP_SIZE_3000_LESS, BODYTEXTH_SIZE_3000_MORE, BODYTEXTH_SIZE_10000_LESS, __MIME_TEXT_H1, __MIME_TEXT_P1, __MIME_HTML, __TAG_EXISTS_HTML, __URI_NS, HTML_50_70, __FRAUD_MONEY_BIG_COIN, __FRAUD_WEBMAIL, __OUTLOOK_MUA, __MIME_TEXT_H, __MIME_TEXT_P, FORGED_MUA_OUTLOOK, NO_URI_HTTPS Received: from gnat (86.185.176.70) by rgout03.bt.lon5.cpcloud.co.uk (9.0.019.13-1) (authenticated as alan.melia@btinternet.com) id 58A82A5C132A3AA5 for rsgb_lf_group@blacksheep.org; Tue, 15 Aug 2017 20:46:19 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btcpcloud; t=1502826383; bh=44FAb19+gOs4Arbk12b+RKCtn/1oefG7H4rZUo4hXpc=; h=Message-ID:From:To:References:Subject:Date:MIME-Version:X-Mailer; b=Vc1fTbGYpslvThnw2zLTaf6ZGiy2oPRXXDXwq7fqO8PNYtOAvCb83xR+YxWEhCkGTxpazN/LLfrA+9cqTcWZ9XSwCkgnYBiwjTcFV6nmvU+ATCJvHaQeIPod4tUbw1yI8vpI9wQJ793USUIbKW9CCv2PKy9qvKPIc907IpvnqL4= Message-ID: <8B69C5D938E54F6B987C46A0EBBC28D7@gnat> From: "Alan Melia" To: References: <0883B95D3F4D417F975C59A900E1A838@gnat>, <272A11EB6A80467D9FA04EFAF51DD15A@ASUS>, <598593FD.8070804@posteo.de> <201708151752325620124@lineone.net> Date: Tue, 15 Aug 2017 20:42:46 +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: 94a3ffcd3903efbf0b2b811b1b1cc0bf Subject: Re: Re: LF: RE:G4HUP aerial current meter Content-Type: multipart/alternative; boundary="----=_NextPart_000_0084_01D31607.0D146960" 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 2.75 Status: RO X-Status: X-Keywords: X-UID: 12390 This is a multi-part message in MIME format. ------=_NextPart_000_0084_01D31607.0D146960 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Hugh thanks for that.......I dont have a power source at the = moment.Yes they would probably just survive 2A but certainly not 10.The = solution then is to increase the number of turns on the ferrite. Though = I think reducing the load (two 100R in parallel currently :-)) ) would = work too. say 2 x 10R ??The original components were designed to get the = 100mA range I think. That needs checking against Ian GM3SEK's web site. Alan ----- Original Message -----=20 From: dhchurch@lineone.net=20 To: rsgb_lf_group=20 Sent: Tuesday, August 15, 2017 5:52 PM Subject: Re: Re: LF: RE:G4HUP aerial current meter Having just put this meter into use, I must point out that the dc = output from the BAT42 diodes is about 15V for the 1A range so I would = have thought actually potting this down after rectification with 10A = would promptly see off the diodes which, I think, are rated at 30piV. Hugh, M0DSZ -------------------------------------------------------------------------= ----- dhchurch@lineone.net From: DK7FC Date: 2017-08-05 10:46 To: rsgb_lf_group Subject: Re: LF: RE:G4HUP aerial current meter Hi Ian, When the range of a current tranformer should be increased from 1A = to=20 10A, the best way is to increase the number of turns of the = secondary=20 winding by a factor 10. This transforms the current down by a factor = 10=20 (not up) in the secondary winding... I*N has the same value on both sides (ideally/theoretically). 73, Stefan Am 05.08.2017 11:35, schrieb i.frith@ntlworld.com: > Hello Allan > > I assume the 10A mod is a matter of increasing the series R with = the=20 > meter to around 800k? > > I suppose a 3way switch and extra trim pot could be added to = preserve=20 > the 1A range too. > > Thanks for the note re-shipping Monday. > > Look forward to getting the Kit. > > 73 > > Ian G4GIR > > -----Original Message----- From: Alan Melia > Sent: Friday, August 4, 2017 9:36 PM > To: rsgb_lf_group@yahoogroups.co.uk ; rsgb_lf_group@blacksheep.org > Subject: LF: RE:G4HUP aerial current meter > > It has just occured to me that the 1A range may not be high enough = for=20 > some > of the LF QRO merchants. There is a simple mod which will extend = the=20 > range > up to 10A though you should be aware the ferrite core has not been = > tested at > this level of RF. These cores are used on mains leads carrying up = to=20 > 13A so > I think they will be OK. > > Thank you to those showing interest, there are a few kits still=20 > available. > > Alan > G3NYK > > ------=_NextPart_000_0084_01D31607.0D146960 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Hugh thanks for that.......I dont = have a power=20 source at the moment.Yes they would probably just survive 2A but = certainly not=20 10.The solution then is to increase the number of turns on the ferrite. = Though I=20 think reducing the load (two 100R in parallel currently :-))  = ) would=20 work too. say 2 x 10R ??The original components were designed to get the = 100mA=20 range I think. That needs checking against Ian GM3SEK's web = site.
 
Alan
 
----- Original Message -----
From:=20 dhchurch@lineone.net
Sent: Tuesday, August 15, 2017 = 5:52=20 PM
Subject: Re: Re: LF: RE:G4HUP = aerial=20 current meter

Having just put this meter into use, I must point = out that=20 the dc output from the BAT42 diodes is about 15V for the 1A range so I = would=20 have thought actually potting this down after rectification with 10A = would=20 promptly see off the diodes which, I think, are rated at 30piV.

Hugh, M0DSZ
dhchurch@lineone.net
=
 
From: DK7FC
Date: 2017-08-05 10:46
To: rsgb_lf_group
Subject: Re: LF: RE:G4HUP aerial current=20 meter
Hi Ian,
 
When the range of a current tranformer should be increased from = 1A to=20
10A, the best way is to increase the number of turns of the = secondary=20
winding by a factor 10. This transforms the current down by a = factor 10=20
(not up) in the secondary winding...
I*N has the same value on both sides = (ideally/theoretically).
 
73, Stefan
 
Am 05.08.2017 11:35, schrieb i.frith@ntlworld.com:
> Hello Allan
>
> I assume the 10A mod is a matter of increasing the series = R with=20 the
> meter to around 800k?
>
> I suppose a 3way switch and extra trim pot could be added = to=20 preserve
> the 1A range too.
>
> Thanks for the note re-shipping Monday.
>
> Look forward to getting the Kit.
>
> 73
>
> Ian G4GIR
>
> -----Original Message----- From: Alan Melia
> Sent: Friday, August 4, 2017 9:36 PM
> To: rsgb_lf_group@yahoogroups.co.uk ;=20 rsgb_lf_group@blacksheep.org
> Subject: LF: RE:G4HUP aerial current meter
>
> It has just occured to me that the 1A range may not be = high enough=20 for
> some
> of the LF QRO merchants. There is a simple mod which will = extend=20 the
> range
> up to 10A though you should be aware the ferrite core has = not been=20
> tested at
> this level of RF. These cores are used on mains leads = carrying up=20 to
> 13A so
> I think they will be OK.
>
> Thank you to those showing interest, there are a few kits = still=20
> available.
>
> Alan
> G3NYK
>
>
 
------=_NextPart_000_0084_01D31607.0D146960--