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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
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Date: Sun, 10 Nov 2013 21:44:52 +0000
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Subject: RE: LF: remote antenna tuning
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Hi Stefan,


thanks for the info.

In one of the previous mails you asked me about the PA: it is a push-pull c=
lass D PA. I am using that type of PA for many years on 136 kHz and 500 kHz=
 (now 475 kHz) to my satisfaction.

Using a couple of cheap IRFP450's it produces up to 500 W RF power at 85% e=
ffeciency. And it is very forgiving to mismatch.


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: zondag 10 november 2013 16:22
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: remote antenna tuning

Hello Rik,

Am 08.11.2013 22:43, schrieb Rik Strobbe:

Hello Gary, Graham, Dave,


thanks for the info. I will build the MBMU tuning meter.


73, Rik  ON7YD - OR7T

BTW, i'm using this circuit in addition to the M0BMU phase meter to automat=
ically steer the motor that rotates the variometer coil: https://dl.dropbox=
usercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg Min=
or alignment of the circuit may be necessary in order to prevent mechanical=
 self oscillations of the system. It works very well since 2 years now. And=
 it looks as i'm using the same motor as G4WGT :-) On LF i have to re-tune =
the resonance peak when doing QSY by 10 Hz(!) so it would work on MF withou=
t a problem.

Actually a good idea to build it here for MF too. One could use a simple CA=
T5 cable to bring the DC voltage coming from the phase meter to the shack a=
nd to bring the motor supply voltage back to the coil. If i would be a mirc=
ocontroller programmer, it would be easy to realise a power meter, impedanc=
e meter, antenna current meter, phase meter (digital displayed). Such a LF/=
MF station seems never to become complete :-)

73, Stefan/DK7FC

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1">
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10pt;">
<p>Hi Stefan,</p>
<p>&nbsp;</p>
<p>thanks for the info.</p>
<p>In one of the previous mails you asked me about the PA: it is a push-pul=
l class D PA. I am using that type of PA for many years on 136 kHz and 500 =
kHz (now 475 kHz) to my satisfaction.</p>
<p>Using a couple of cheap IRFP450's it produces up to 500 W RF power at 85=
% effeciency. And it is very forgiving to mismatch.</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"divRpF181930" 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> zondag 10 november 2013 16:22<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>Hello Rik,<br>
<br>
Am 08.11.2013 22:43, 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>Hello Gary, Graham, Dave,</p>
<p>&nbsp;</p>
<p>thanks for the info. I will build the MBMU tuning meter.</p>
<p>&nbsp;</p>
<p>73, Rik&nbsp; ON7YD - OR7T</p>
</div>
</blockquote>
<br>
BTW, i'm using this circuit in addition to the M0BMU phase meter to automat=
ically steer the motor that rotates the variometer coil:
<a class=3D"moz-txt-link-freetext" href=3D"https://dl.dropboxusercontent.co=
m/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg" target=3D"_blank=
">
https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variomete=
r_tuner%20.jpg</a> Minor alignment of the circuit may be necessary in order=
 to prevent mechanical self oscillations of the system. It works very well =
since 2 years now. And it looks
 as i'm using the same motor as G4WGT :-) On LF i have to re-tune the reson=
ance peak when doing QSY by 10 Hz(!) so it would work on MF without a probl=
em.<br>
<br>
Actually a good idea to build it here for MF too. One could use a simple CA=
T5 cable to bring the DC voltage coming from the phase meter to the shack a=
nd to bring the motor supply voltage back to the coil. If i would be a mirc=
ocontroller programmer, it would
 be easy to realise a power meter, impedance meter, antenna current meter, =
phase meter (digital displayed). Such a LF/MF station seems never to become=
 complete :-)<br>
<br>
73, Stefan/DK7FC<br>
</div>
</div>
</div>
</body>
</html>

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