Return-Path: X-Spam-DCC: paranoid 1002; 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=1.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_MUA_OUTLOOK,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 t9NN0spE013642 for ; Sat, 24 Oct 2015 01:00:54 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZplHR-0001XL-EB for rs_out_1@blacksheep.org; Fri, 23 Oct 2015 23:57:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZplHR-0001XC-01 for rsgb_lf_group@blacksheep.org; Fri, 23 Oct 2015 23:57:49 +0100 Received: from rgout0602.bt.lon5.cpcloud.co.uk ([65.20.0.129]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZplGM-0002Mj-Pe for rsgb_lf_group@blacksheep.org; Fri, 23 Oct 2015 23:57:47 +0100 X-OWM-Source-IP: 86.149.134.195 (GB) X-OWM-Env-Sender: alan.melia@btinternet.com X-CTCH-RefID: str=0001.0A090202.562ABB1A.0028,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0 X-Junkmail-Premium-Raw: score=39/50,refid=2.7.2:2015.10.14.95116:17:39.532,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, __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, URI_ENDS_IN_HTML, __URI_NO_WWW, __CP_MEDIA_BODY, __CP_URI_IN_BODY, __C230066_P5, __SUBJ_ALPHA_NEGATE, SUPERLONG_LINE, __URI_IN_BODY, __HTML_AHREF_TAG, __HAS_HTML, BODY_SIZE_10000_PLUS, __MIME_HTML, __TAG_EXISTS_HTML, RDNS_GENERIC_POOLED, __URI_NS, SXL_IP_DYNAMIC[195.134.149.86.fur], HTML_50_70, 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 rgout06.bt.lon5.cpcloud.co.uk (8.6.122.06) (authenticated as alan.melia@btinternet.com) id 561CCAD0014894E7 for rsgb_lf_group@blacksheep.org; Fri, 23 Oct 2015 23:56:26 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=btcpcloud; t=1445641002; bh=1z6Mt8qlkNBswpevSP725Y8bMXe5Qj2fxp05UcV6pk8=; h=Message-ID:From:To:References:Subject:Date:MIME-Version:X-Mailer; b=G3CZHrdaHeI/fi4isoUHjBlLdsYW5QHdkCVxuAvyUHd02uDNGPPWabXs+ILKHSgdMypr02mM5n+XVPm4o4TyvNqgi5YLC6uR5XFrYXQ/xAB8xvH/pK0hrz42LSUH9xTx3MWlE0wgiIWZ/WAbqBZtpJ1KDSRic4AeW9gCRqwK2vk= Message-ID: <96FBCAC698BC4A28B15E4B25F9C3EB30@gnat> From: "Alan Melia" To: References: <579355A36AEE9D4FA555C45D556003AB1B25A181@servigilant.vigilant.local> <5628B2D0.7060002@posteo.de> <5629507B.6010907@posteo.de> <360BD4613E1A4110ABB92063DA37C523@pcn5> <562AAEBA.8080502@posteo.de> <47FC42C8A3FA48D482F115C9C3D8787B@gnat> <562AB572.7030302@posteo.de> Date: Fri, 23 Oct 2015 23:56:18 +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: 81bfb86f88251daa8e0899e4ba7e8646 Subject: Re: LF: To DK7FC : measuring low levels RF current. Content-Type: multipart/alternative; boundary="----=_NextPart_000_003E_01D10DEE.691052B0" 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: 4594 This is a multi-part message in MIME format. ------=_NextPart_000_003E_01D10DEE.691052B0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Stefan No probably I misunderstood your exchange with Andi :-)) Alan ----- Original Message -----=20 From: DK7FC=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, October 23, 2015 11:32 PM Subject: Re: LF: To DK7FC : measuring low levels RF current. Hi Alan,=20 Hm, do i misunderstand something now?=20 Just to make it clear: I certainly know how to measure a RF current on = DC to HF and above :-) Higher currents? Well, 20A is fine for me, otherwise the decca RF sitz = becomes to warm, not to talk about the high voltages ;-) 73, Stefan Am 24.10.2015 00:18, schrieb Alan Melia:=20 Stefan try a look at http://g4hup.com/RFC/RFC.htm its 100ma/1A full-scale. Follow the documentation, click under the = pic and find the circuit and cal procedure which should give a clue to = reading higher currents too. Alan G3NYK=20 ----- Original Message -----=20 From: DK7FC=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Friday, October 23, 2015 11:03 PM Subject: Re: LF: To DK7FC : measuring low levels RF current. Hello Andi,=20 Thanks for the info. What does this amperemeter cost? I think i would know how to build an amperemeter for 100 mA FS. = However my ranges are 5A / 10A / 20A :-) I'm directly measuring the = antenna current, i.e. not on the 50 Ohm level. 73, Stefan Am 23.10.2015 14:53, schrieb F6CNI - Andy - JN19QB:=20 Helo Stefan, For info, here I am using a MFJ 834 RF Ammeter. It is working = well on MF band, it just need to be first re-calibrate on MF band (only = one variable resistance to adjust) using a low power signal into a 50 = Ohms pure resistive load. It is quite linear for RF current measurement from 25 mA to 3 = Amperes, in 3 swiched scales.=20 Using it on the 50 Ohms coaxial cable, just after your TX = output, you have a good estimation of your TX power output from 30 milli = watt to 450 watts. You can also use it on the cold end of the antenna side. = Depending at the overall antenna system resistance, you can read the = real antenna current=E2=80=A6 73 de Andy. From: DK7FC=20 Sent: Thursday, October 22, 2015 11:09 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: M0LMH Hi MF, Since a few hours i'm transmitting WSPR with the variable mains = transformer turned to 0%. So just the driver is switching the FETs. = Anyway a few mW TX power seem to be generated and radiated. I can see no = reading on the RF amperemeter. Anyway i got 15 spots: Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az = 2015-10-22 20:14 DK7FC 0.475685 -22 0 JN49ik 1 = M0LMH IO93gx 862 310 =20 2015-10-22 20:24 DK7FC 0.475683 -19 0 JN49ik 1 F5WK = JN18hp 452 261 =20 2015-10-22 20:44 DK7FC 0.475682 -21 0 JN49ik 1 PA0A = JO33de 449 339 =20 2015-10-22 20:14 DK7FC 0.475682 -26 0 JN49ik 1 = PA0RDT JO11tm 428 305 =20 2015-10-22 20:14 DK7FC 0.475683 -17 0 JN49ik 1 = PA3ABK JO21it 386 315 =20 2015-10-22 20:14 DK7FC 0.475683 -15 0 JN49ik 1 = DH5RAE JN68qv 345 98 =20 2015-10-22 20:14 DK7FC 0.475683 -18 0 JN49ik 1 = PI4THT JO32kf 336 338 =20 2015-10-22 20:14 DK7FC 0.475683 -15 0 JN49ik 1 = DJ0ABR JN68nt 329 101 =20 2015-10-22 20:14 DK7FC 0.475683 -22 0 JN49ik 1 = DG8RW JN69cv 257 77 =20 2015-10-22 20:14 DK7FC 0.475682 -23 0 JN49ik 1 = DF2JP JO31hh 256 325 =20 2015-10-22 20:54 DK7FC 0.475683 -27 1 JN49ik 1 = DC0DX_H JO31lk 255 332 =20 2015-10-22 20:24 DK7FC 0.475684 -24 0 JN49ik 1 = DB1EPO JO31hg 252 325 =20 2015-10-22 20:14 DK7FC 0.475684 -21 0 JN49ik 1 = DF6NM JN59nj 175 91 =20 2015-10-22 20:14 DK7FC 0.475684 -7 0 JN49ik 1 DK2DB = JN48fw 58 198 =20 2015-10-22 20:34 DK7FC 0.475686 -10 0 JN49ik 1 = DF8UO JN48ex 56 206 =20 M0LMH is the best distance. Also in daytime i can see that M0LMH = is receiving me, often beeing the only one from UK. Does someone know him and his equipment? Would be interesting to = know! In IO93GX, there is not population. Certainly one reason for the = good results... 73, Stefan PS: Now QRO... ------=_NextPart_000_003E_01D10DEE.691052B0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF
Hi Stefan No probably I misunderstood = your exchange=20 with Andi :-))
Alan
----- Original Message -----
From:=20 DK7FC=20
Sent: Friday, October 23, 2015 = 11:32=20 PM
Subject: Re: LF: To DK7FC : = measuring low=20 levels RF current.

Hi Alan,

Hm, do i misunderstand something now? =
Just=20 to make it clear: I certainly know how to measure a RF current on DC = to HF and=20 above :-)
Higher currents? Well, 20A is fine for me, otherwise the = decca RF=20 sitz becomes to warm, not to talk about the high voltages = ;-)

73,=20 Stefan

Am 24.10.2015 00:18, schrieb Alan Melia:=20
Stefan try a look at http://g4hup.com/RFC/RFC.htm
its 100ma/1A full-scale. Follow the = documentation, click under the pic and find the circuit and cal = procedure which should give a clue to reading higher currents=20 too.
 
Alan
G3NYK 
-----=20 Original Message ----- From:=20 DK7FC To:=20 rsgb_lf_group@blacksheep.org Sent:=20 Friday, October 23, 2015 11:03 PM Subject:=20 Re: LF: To DK7FC : measuring low levels RF current.

Hello Andi,

Thanks for the info. What does = this=20 amperemeter cost?
I think i would know how to build an = amperemeter for=20 100 mA FS. However my ranges are 5A / 10A / 20A :-) I'm directly = measuring=20 the antenna current, i.e. not on the 50 Ohm level.

73,=20 Stefan

Am 23.10.2015 14:53, schrieb F6CNI - Andy - JN19QB:=20

Helo Stefan,

 

For info, here I am using a MFJ 834 RF = Ammeter. It is=20 working well on MF band, it just need to be first re-calibrate = on MF=20 band (only one variable resistance to adjust) using a low power = signal=20 into a 50 Ohms pure resistive load.

 

It is quite linear for RF current measurement from = 25 mA to 3=20 Amperes, in 3 swiched scales.

 

Using it on the 50 Ohms coaxial cable, just after = your TX=20 output, you have a good estimation of your TX power output from = 30 milli=20 watt to 450 watts.

 

You can also use it on the cold end of the antenna = side.=20 Depending at the overall antenna system resistance, you can read = the=20 real antenna current=E2=80=A6

 

73 de Andy.

 
From: DK7FC=20
Sent: Thursday, October 22, 2015 11:09 PM
Subject: LF: M0LMH
 
Hi=20 MF,

Since a few hours i'm transmitting WSPR with the = variable=20 mains transformer turned to 0%. So just the driver is switching = the=20 FETs. Anyway a few mW TX power seem to be generated and = radiated. I can=20 see no reading on the RF amperemeter.
Anyway i got 15 = spots:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2015-10-22 20:14 DK7FC 0.475685 -22 0 JN49ik 1 M0LMH IO93gx 862 310
2015-10-22 20:24 DK7FC 0.475683 -19 0 JN49ik 1 F5WK JN18hp 452 261
2015-10-22 20:44 DK7FC 0.475682 -21 0 JN49ik 1 PA0A JO33de 449 339
2015-10-22 20:14 DK7FC 0.475682 -26 0 JN49ik 1 PA0RDT JO11tm 428 305
2015-10-22 20:14 DK7FC 0.475683 -17 0 JN49ik 1 PA3ABK JO21it 386 315
2015-10-22 20:14 DK7FC 0.475683 -15 0 JN49ik 1 DH5RAE JN68qv 345 98
2015-10-22 20:14 DK7FC 0.475683 -18 0 JN49ik 1 PI4THT JO32kf 336 338
2015-10-22 20:14 DK7FC 0.475683 -15 0 JN49ik 1 DJ0ABR JN68nt 329 101
2015-10-22 20:14 DK7FC 0.475683 -22 0 JN49ik 1 DG8RW JN69cv 257 77
2015-10-22 20:14 DK7FC 0.475682 -23 0 JN49ik 1 DF2JP JO31hh 256 325
2015-10-22 20:54 DK7FC 0.475683 -27 1 JN49ik 1 DC0DX_H JO31lk 255 332
2015-10-22 20:24 DK7FC 0.475684 -24 0 JN49ik 1 DB1EPO JO31hg 252 325
2015-10-22 20:14 DK7FC 0.475684 -21 0 JN49ik 1 DF6NM JN59nj 175 91
2015-10-22 20:14 DK7FC 0.475684 -7 0 JN49ik 1 DK2DB JN48fw 58 198
2015-10-22 20:34 DK7FC 0.475686 -10 0 JN49ik 1 DF8UO JN48ex 56 206

M0LMH is = the best=20 distance. Also in daytime i can see that M0LMH is receiving me, = often=20 beeing the only one from UK.
Does someone know him and his = equipment?=20 Would be interesting to know! In IO93GX, there is not = population.=20 Certainly one reason for the good results...

73,=20 Stefan

PS: Now=20 = QRO...
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