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From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: remote antenna tuning
Thread-Index: AQHO3HCUCD1oahz2q0ikAFZZ4yK07pobS52AgAASlqCAABILgIAAKgUAgAADwoCAAB5SXA==
Date: Fri, 8 Nov 2013 19:44:56 +0000
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Subject: RE: LF: remote antenna tuning
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I had a look at the M0BMU LF tuning meter and will built it.

Does anyone used it on 475/500 kHz? Maybe the transformers need to be adapt=
ed but that should be no real problem.


73, Rik  ON7YD - OR7T


________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org=
] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: vrijdag 8 november 2013 19:53
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: remote antenna tuning

Oh yes, or, a phase meter (M0BMU) and a battery operated variometer motor. =
Without an additional cable to the shack. Then the SWR meter in the shack c=
onfirms that everything is fine.

73, Stefan

Am 08.11.2013 19:40, schrieb pat:
Hi All,

A suggestion: battery operated tuning device at antenna end and "wireless" =
link back to shack. Wireless can operate at a non-interfering frequncy (HF/=
VHF/UHF/Optical).

73


On 08/11/13 16:09, Stefan Sch=E4fer wrote:
Hi Rik,

Am 08.11.2013 16:06, schrieb Rik Strobbe:

Hi Stefan,


remote tuning of the loading should be done by optimizing SWR (at the TX), =
not for maximum RF current.

If one keeps that in mind there is no problem.

...which is in agreement with what i said.
But once you have matched your antenna to 50 Ohm on resonance and you can o=
nly vary the reactive part of the antennas impedance (after doing QSY), the=
n you will get the maximum antenna current at best SWR (assuming that Rrad+=
Rloss is constant which is not to far from reality).


I am not sure if I will keep the remote variometer tuning. It needs some ex=
tra wires to the loading coil and I am not sure how long the small DC motor=
 will function properly with all the rain and frost coming up.

Here it holds since more than 2 years for LF now..

73, Stefan


--
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK

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10pt;">
<p>I had a look at the M0BMU LF tuning meter and will built it.</p>
<p>Does anyone used it on 475/500 kHz? Maybe the transformers need to be ad=
apted but that should be no real problem.</p>
<p>&nbsp;</p>
<p>73, Rik&nbsp; ON7YD - OR7T</p>
<p>&nbsp;</p>
<div style=3D"FONT-SIZE: 16px; FONT-FAMILY: Times New Roman; COLOR: #000000=
">
<hr tabindex=3D"-1">
<div id=3D"divRpF450350" style=3D"DIRECTION: ltr"><font color=3D"#000000" s=
ize=3D"2" face=3D"Tahoma"><b>Van:</b> owner-rsgb_lf_group@blacksheep.org [o=
wner-rsgb_lf_group@blacksheep.org] namens Stefan Sch=E4fer [Stefan.Schaefer=
@iup.uni-heidelberg.de]<br>
<b>Verzonden:</b> vrijdag 8 november 2013 19:53<br>
<b>Aan:</b> rsgb_lf_group@blacksheep.org<br>
<b>Onderwerp:</b> Re: LF: remote antenna tuning<br>
</font><br>
</div>
<div></div>
<div>Oh yes, or, a phase meter (M0BMU) and a battery operated variometer mo=
tor. Without an additional cable to the shack. Then the SWR meter in the sh=
ack confirms that everything is fine.<br>
<br>
73, Stefan<br>
<br>
Am 08.11.2013 19:40, schrieb pat:
<blockquote type=3D"cite">
<div class=3D"moz-cite-prefix">Hi All,<br>
<br>
A suggestion: battery operated tuning device at antenna end and &quot;wirel=
ess&quot; link back to shack. Wireless can operate at a non-interfering fre=
quncy (HF/VHF/UHF/Optical).<br>
<br>
73<br>
<br>
<br>
<br>
<br>
<br>
<br>
On 08/11/13 16:09, Stefan Sch=E4fer wrote:<br>
</div>
<blockquote type=3D"cite">Hi Rik,<br>
<br>
Am 08.11.2013 16:06, schrieb Rik Strobbe:
<blockquote type=3D"cite">
<div style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; COLOR: rgb(0,0,0); DIRE=
CTION: ltr">
<p>Hi&nbsp;Stefan,</p>
<p>&nbsp;</p>
<p>remote&nbsp;tuning of the&nbsp;loading&nbsp;should&nbsp;be&nbsp;done&nbs=
p;by&nbsp;optimizing&nbsp;SWR (at the TX),&nbsp;not&nbsp;for maximum&nbsp;R=
F current.</p>
<p>If&nbsp;one&nbsp;keeps&nbsp;that in&nbsp;mind&nbsp;there is&nbsp;no prob=
lem.</p>
</div>
</blockquote>
...which is in agreement with what i said.<br>
But once you have matched your antenna to 50 Ohm on resonance and you can o=
nly vary the reactive part of the antennas impedance (after doing QSY), the=
n you will get the maximum antenna current at best SWR (assuming that Rrad&=
#43;Rloss is constant which is not to
 far from reality).<br>
<br>
<blockquote type=3D"cite">
<div style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; COLOR: rgb(0,0,0); DIRE=
CTION: ltr">
<p>I&nbsp;am&nbsp;not&nbsp;sure&nbsp;if I&nbsp;will keep the&nbsp;remote&nb=
sp;variometer tuning.&nbsp;It&nbsp;needs&nbsp;some extra&nbsp;wires to the&=
nbsp;loading&nbsp;coil and I&nbsp;am&nbsp;not&nbsp;sure&nbsp;how long the&n=
bsp;small&nbsp;DC motor&nbsp;will&nbsp;function&nbsp;properly&nbsp;with all=
 the&nbsp;rain and&nbsp;frost coming up.</p>
</div>
</blockquote>
Here it holds since more than 2 years for LF now..<br>
<br>
73, Stefan<br>
<br>
<blockquote type=3D"cite">
<div style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; COLOR: rgb(0,0,0); DIRE=
CTION: ltr">
</div>
</blockquote>
</blockquote>
<br>
<br>
<pre class=3D"moz-signature" cols=3D"72">--=20
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK</pre>
</blockquote>
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