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From: "F6CNI - Andy - JN19QB" <f6cni@orange.fr>
To: <rsgb_lf_group@blacksheep.org>
References: <579355A36AEE9D4FA555C45D556003AB1B25A181@servigilant.vigilant.local> <5628B2D0.7060002@posteo.de> <5629507B.6010907@posteo.de>
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Subject: LF: To DK7FC : measuring low levels RF current.
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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=20
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_000E_01D10DA2.947406F0
Content-Type: text/html;
charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<HTML><HEAD>
<META content=3D"text/html; charset=3DISO-8859-1" =
http-equiv=3DContent-Type></HEAD>
<BODY dir=3Dltr bgColor=3D#ffffff text=3D#000000>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>Helo Stefan,</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>For info, here I am using a <B=20
style=3D"mso-bidi-font-weight: normal">MFJ 834</B> RF Ammeter. It is =
working well=20
on MF band, it just need to be first re-calibrate on MF band (only one =
variable=20
resistance to adjust) using a low power signal into a 50 Ohms pure =
resistive=20
load.</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>It=20
is quite linear for RF current measurement from 25 mA to 3 Amperes, in 3 =
swiched=20
scales. </FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>Using it on the 50 Ohms coaxial cable, just after your TX =
output, you=20
have a good estimation of your TX power output from 30 milli watt to 450 =
watts.</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>You can also use it on the cold end of the antenna side. =
Depending at=20
the overall antenna system resistance, you can read the real antenna=20
current=E2=80=A6</FONT></P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN: 0cm 0cm 0pt" align=3Djustify><FONT =
face=3DArial>73=20
de Andy.</FONT></P>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dselberdenken@posteo.de=20
href=3D"mailto:selberdenken@posteo.de">DK7FC</A> </DIV>
<DIV><B>Sent:</B> Thursday, October 22, 2015 11:09 PM</DIV>
<DIV><B>To:</B> <A title=3Drsgb_lf_group@blacksheep.org=20
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
</DIV>
<DIV><B>Subject:</B> LF: M0LMH</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>Hi=20
MF,<BR><BR>Since a few hours i'm transmitting WSPR with the variable =
mains=20
transformer turned to 0%. So just the driver is switching the FETs. =
Anyway a few=20
mW TX power seem to be generated and radiated. I can see no reading on =
the RF=20
amperemeter.<BR>Anyway i got 15 spots:<BR>
<TABLE style=3D"COLOR: #000000">
<TBODY>
<TR>
<TH>Timestamp</TH>
<TH>Call</TH>
<TH>MHz</TH>
<TH>SNR</TH>
<TH>Drift</TH>
<TH>Grid</TH>
<TH>Pwr</TH>
<TH>Reporter</TH>
<TH>RGrid</TH>
<TH>km</TH>
<TH>az</TH></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475685 </TD>
<TD align=3Dright>-22 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>M0LMH </TD>
<TD align=3Dleft>IO93gx </TD>
<TD align=3Dright>862 </TD>
<TD align=3Dright>310 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:24 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-19 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>F5WK </TD>
<TD align=3Dleft>JN18hp </TD>
<TD align=3Dright>452 </TD>
<TD align=3Dright>261 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:44 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475682 </TD>
<TD align=3Dright>-21 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>PA0A </TD>
<TD align=3Dleft>JO33de </TD>
<TD align=3Dright>449 </TD>
<TD align=3Dright>339 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475682 </TD>
<TD align=3Dright>-26 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>PA0RDT </TD>
<TD align=3Dleft>JO11tm </TD>
<TD align=3Dright>428 </TD>
<TD align=3Dright>305 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-17 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>PA3ABK </TD>
<TD align=3Dleft>JO21it </TD>
<TD align=3Dright>386 </TD>
<TD align=3Dright>315 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-15 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DH5RAE </TD>
<TD align=3Dleft>JN68qv </TD>
<TD align=3Dright>345 </TD>
<TD align=3Dright>98 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-18 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>PI4THT </TD>
<TD align=3Dleft>JO32kf </TD>
<TD align=3Dright>336 </TD>
<TD align=3Dright>338 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-15 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DJ0ABR </TD>
<TD align=3Dleft>JN68nt </TD>
<TD align=3Dright>329 </TD>
<TD align=3Dright>101 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-22 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DG8RW </TD>
<TD align=3Dleft>JN69cv </TD>
<TD align=3Dright>257 </TD>
<TD align=3Dright>77 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475682 </TD>
<TD align=3Dright>-23 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DF2JP </TD>
<TD align=3Dleft>JO31hh </TD>
<TD align=3Dright>256 </TD>
<TD align=3Dright>325 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:54 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475683 </TD>
<TD align=3Dright>-27 </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DC0DX_H </TD>
<TD align=3Dleft>JO31lk </TD>
<TD align=3Dright>255 </TD>
<TD align=3Dright>332 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:24 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475684 </TD>
<TD align=3Dright>-24 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DB1EPO </TD>
<TD align=3Dleft>JO31hg </TD>
<TD align=3Dright>252 </TD>
<TD align=3Dright>325 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475684 </TD>
<TD align=3Dright>-21 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DF6NM </TD>
<TD align=3Dleft>JN59nj </TD>
<TD align=3Dright>175 </TD>
<TD align=3Dright>91 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:14 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475684 </TD>
<TD align=3Dright>-7 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DK2DB </TD>
<TD align=3Dleft>JN48fw </TD>
<TD align=3Dright>58 </TD>
<TD align=3Dright>198 </TD></TR>
<TR>
<TD align=3Dright>2015-10-22 20:34 </TD>
<TD align=3Dleft>DK7FC </TD>
<TD align=3Dright>0.475686 </TD>
<TD align=3Dright>-10 </TD>
<TD align=3Dright>0 </TD>
<TD align=3Dleft>JN49ik </TD>
<TD align=3Dright>1 </TD>
<TD align=3Dleft>DF8UO </TD>
<TD align=3Dleft>JN48ex </TD>
<TD align=3Dright>56 </TD>
<TD align=3Dright>206 </TD></TR></TBODY></TABLE><BR>M0LMH is the =
best distance.=20
Also in daytime i can see that M0LMH is receiving me, often beeing the =
only one=20
from UK.<BR>Does someone know him and his equipment? Would be =
interesting to=20
know! In IO93GX, there is not population. Certainly one reason for the =
good=20
results...<BR><BR>73, Stefan<BR><BR>PS: Now=20
QRO...<BR></DIV></DIV></DIV></BODY></HTML>
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