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,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 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 v7FH48sS022041 for ; Tue, 15 Aug 2017 19:04:12 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dhf5S-0005cZ-6F for rs_out_1@blacksheep.org; Tue, 15 Aug 2017 17:53:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dhf5R-0005cQ-B1 for rsgb_lf_group@blacksheep.org; Tue, 15 Aug 2017 17:53:01 +0100 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1dhf5O-0002ld-Dh for rsgb_lf_group@blacksheep.org; Tue, 15 Aug 2017 17:53:00 +0100 X-IronPort-AV: E=Sophos;i="5.41,378,1498518000"; d="scan'208,217";a="159756096" Received: from unknown (HELO AM1MH) ([82.153.98.90]) by smtpout.karoo.kcom.com with ESMTP; 15 Aug 2017 17:52:44 +0100 Date: Tue, 15 Aug 2017 17:52:32 +0100 From: "dhchurch@lineone.net" To: rsgb_lf_group References: <0883B95D3F4D417F975C59A900E1A838@gnat>, <272A11EB6A80467D9FA04EFAF51DD15A@ASUS>, <598593FD.8070804@posteo.de> X-Priority: 3 X-Has-Attach: no X-Mailer: Foxmail 7, 2, 8, 379[en] Mime-Version: 1.0 Message-ID: <201708151752325620124@lineone.net> X-Scan-Signature: 3d0ae5b4ae8b74dc4bf5c1dbe3fef430 Subject: Re: Re: LF: RE:G4HUP aerial current meter Content-Type: multipart/alternative; boundary="----=_001_NextPart178502831023_=----" 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: 12389 This is a multi-part message in MIME format. ------=_001_NextPart178502831023_=---- Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: base64 SGF2aW5nIGp1c3QgcHV0IHRoaXMgbWV0ZXIgaW50byB1c2UsIEkgbXVzdCBwb2ludCBvdXQgdGhh dCB0aGUgZGMgb3V0cHV0IGZyb20gdGhlIEJBVDQyIGRpb2RlcyBpcyBhYm91dCAxNVYgZm9yIHRo ZSAxQSByYW5nZSBzbyBJIHdvdWxkIGhhdmUgdGhvdWdodCBhY3R1YWxseSBwb3R0aW5nIHRoaXMg ZG93biBhZnRlciByZWN0aWZpY2F0aW9uIHdpdGggMTBBIHdvdWxkIHByb21wdGx5IHNlZSBvZmYg dGhlIGRpb2RlcyB3aGljaCwgSSB0aGluaywgYXJlIHJhdGVkIGF0IDMwcGlWLg0KDQpIdWdoLCBN MERTWg0KDQoNCmRoY2h1cmNoQGxpbmVvbmUubmV0DQogDQpGcm9tOiBESzdGQw0KRGF0ZTogMjAx Ny0wOC0wNSAxMDo0Ng0KVG86IHJzZ2JfbGZfZ3JvdXANClN1YmplY3Q6IFJlOiBMRjogUkU6RzRI VVAgYWVyaWFsIGN1cnJlbnQgbWV0ZXINCkhpIElhbiwNCiANCldoZW4gdGhlIHJhbmdlIG9mIGEg Y3VycmVudCB0cmFuZm9ybWVyIHNob3VsZCBiZSBpbmNyZWFzZWQgZnJvbSAxQSB0byANCjEwQSwg dGhlIGJlc3Qgd2F5IGlzIHRvIGluY3JlYXNlIHRoZSBudW1iZXIgb2YgdHVybnMgb2YgdGhlIHNl Y29uZGFyeSANCndpbmRpbmcgYnkgYSBmYWN0b3IgMTAuIFRoaXMgdHJhbnNmb3JtcyB0aGUgY3Vy cmVudCBkb3duIGJ5IGEgZmFjdG9yIDEwIA0KKG5vdCB1cCkgaW4gdGhlIHNlY29uZGFyeSB3aW5k aW5nLi4uDQpJKk4gaGFzIHRoZSBzYW1lIHZhbHVlIG9uIGJvdGggc2lkZXMgKGlkZWFsbHkvdGhl b3JldGljYWxseSkuDQogDQo3MywgU3RlZmFuDQogDQpBbSAwNS4wOC4yMDE3IDExOjM1LCBzY2hy aWViIGkuZnJpdGhAbnRsd29ybGQuY29tOg0KPiBIZWxsbyBBbGxhbg0KPg0KPiBJIGFzc3VtZSB0 aGUgMTBBIG1vZCBpcyBhIG1hdHRlciBvZiBpbmNyZWFzaW5nIHRoZSBzZXJpZXMgUiB3aXRoIHRo ZSANCj4gbWV0ZXIgdG8gYXJvdW5kIDgwMGs/DQo+DQo+IEkgc3VwcG9zZSBhIDN3YXkgc3dpdGNo IGFuZCBleHRyYSB0cmltIHBvdCBjb3VsZCBiZSBhZGRlZCB0byBwcmVzZXJ2ZSANCj4gdGhlIDFB IHJhbmdlIHRvby4NCj4NCj4gVGhhbmtzIGZvciB0aGUgbm90ZSByZS1zaGlwcGluZyBNb25kYXku DQo+DQo+IExvb2sgZm9yd2FyZCB0byBnZXR0aW5nIHRoZSBLaXQuDQo+DQo+IDczDQo+DQo+IElh biBHNEdJUg0KPg0KPiAtLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLSBGcm9tOiBBbGFuIE1lbGlh DQo+IFNlbnQ6IEZyaWRheSwgQXVndXN0IDQsIDIwMTcgOTozNiBQTQ0KPiBUbzogcnNnYl9sZl9n cm91cEB5YWhvb2dyb3Vwcy5jby51ayA7IHJzZ2JfbGZfZ3JvdXBAYmxhY2tzaGVlcC5vcmcNCj4g U3ViamVjdDogTEY6IFJFOkc0SFVQIGFlcmlhbCBjdXJyZW50IG1ldGVyDQo+DQo+IEl0IGhhcyBq dXN0IG9jY3VyZWQgdG8gbWUgdGhhdCB0aGUgMUEgcmFuZ2UgbWF5IG5vdCBiZSBoaWdoIGVub3Vn aCBmb3IgDQo+IHNvbWUNCj4gb2YgdGhlIExGIFFSTyBtZXJjaGFudHMuIFRoZXJlIGlzIGEgc2lt cGxlIG1vZCB3aGljaCB3aWxsIGV4dGVuZCB0aGUgDQo+IHJhbmdlDQo+IHVwIHRvIDEwQSB0aG91 Z2ggeW91IHNob3VsZCBiZSBhd2FyZSB0aGUgZmVycml0ZSBjb3JlIGhhcyBub3QgYmVlbiANCj4g dGVzdGVkIGF0DQo+IHRoaXMgbGV2ZWwgb2YgUkYuIFRoZXNlIGNvcmVzIGFyZSB1c2VkIG9uIG1h aW5zIGxlYWRzIGNhcnJ5aW5nIHVwIHRvIA0KPiAxM0Egc28NCj4gSSB0aGluayB0aGV5IHdpbGwg YmUgT0suDQo+DQo+IFRoYW5rIHlvdSB0byB0aG9zZSBzaG93aW5nIGludGVyZXN0LCB0aGVyZSBh cmUgYSBmZXcga2l0cyBzdGlsbCANCj4gYXZhaWxhYmxlLg0KPg0KPiBBbGFuDQo+IEczTllLDQo+ DQo+DQogDQo= ------=_001_NextPart178502831023_=---- Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable =0A
Having just put this meter into= use, I must point out that the dc output from the BAT42 diodes is about 1= 5V for the 1A range so I would have thought actually potting this down aft= er rectification with 10A would promptly see off the diodes which, I think= , are rated at 30piV.

Hugh, M0DSZ
=0A
dhchurch@lineone.net
=0A
&n= bsp;
From: DK7FC
Date: 2017-08-05=  10:46
Subject: Re: LF: RE:G4= HUP aerial current meter
Hi Ian,
=0A
&= nbsp;
=0A
When the range of a current tranformer should be increa= sed from 1A to
=0A
10A, the best way is to increase the number o= f turns of the secondary
=0A
winding by a factor 10. This transf= orms the current down by a factor 10
=0A
(not up) in the seconda= ry winding...
=0A
I*N has the same value on both sides (ideally/t= heoretically).
=0A
 
=0A
73, Stefan
=0A
&n= bsp;
=0A
Am 05.08.2017 11:35, schrieb i.frith@ntlworld.com:
= =0A
> Hello Allan
=0A
>
=0A
> I assume the = 10A mod is a matter of increasing the series R with the
=0A
>= meter to around 800k?
=0A
>
=0A
> I suppose a 3wa= y switch and extra trim pot could be added to preserve
=0A
> = the 1A range too.
=0A
>
=0A
> Thanks for the note = re-shipping Monday.
=0A
>
=0A
> Look forward to ge= tting the Kit.
=0A
>
=0A
> 73
=0A
>=0A
> Ian G4GIR
=0A
>
=0A
> -----Origina= l Message----- From: Alan Melia
=0A
> Sent: Friday, August 4, = 2017 9:36 PM
=0A
> To: rsgb_lf_group@yahoogroups.co.uk ; rsgb_= lf_group@blacksheep.org
=0A
> Subject: LF: RE:G4HUP aerial cur= rent meter
=0A
>
=0A
> It has just occured to me t= hat the 1A range may not be high enough for
=0A
> some
= =0A
> of the LF QRO merchants. There is a simple mod which will ext= end the
=0A
> range
=0A
> up to 10A though you sh= ould be aware the ferrite core has not been
=0A
> tested at=0A
> this level of RF. These cores are used on mains leads car= rying up to
=0A
> 13A so
=0A
> I think they will = be OK.
=0A
>
=0A
> Thank you to those showing inte= rest, there are a few kits still
=0A
> available.
=0A>
=0A
> Alan
=0A
> G3NYK
=0A
>=0A
>
=0A
 
=0A
=0A<= /html> ------=_001_NextPart178502831023_=------