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Date: Sun, 10 Nov 2013 16:22:39 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC908D5@ICTS-S-MBX2.luna.kuleuven.be>,<527CEE11.8070509@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC98037@ICTS-S-MBX1.luna.kuleuven.be> <527D0CCB.6090208@iup.uni-heidelberg.de> <527D300A.7000909@aol.com>,<527D3331.7080109@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99935@ICTS-S-MBX1.luna.kuleuven.be>,<527D4D24.4070309@tiscali.co.uk> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9@ICTS-S-MBX1.luna.kuleuven.be>
In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9@ICTS-S-MBX1.luna.kuleuven.be>
Subject: Re: LF: remote antenna tuning
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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 
automatically steer the motor that rotates the variometer coil: 
https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg 
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 resonance peak when doing QSY by 10 Hz(!) so it 
would work on MF without a problem.

Actually a good idea to build it here for MF too. One could use a simple 
CAT5 cable to bring the DC voltage coming from the phase meter to the 
shack and to bring the motor supply voltage back to the coil. If i would 
be a mircocontroller 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 :-)

73, Stefan/DK7FC

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Hello Rik,<br>
<br>
Am 08.11.2013 22:43, schrieb Rik Strobbe:
<blockquote
 cite="mid:7E7DFBB4D102A04DB5ADC88D66628A4A0FC99DB9@ICTS-S-MBX1.luna.kuleuven.be"
 type="cite">
  <meta http-equiv="Content-Type"
 content="text/html; charset=ISO-8859-1">
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">
  <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
automatically steer the motor that rotates the variometer coil:
<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg">https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_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 resonance peak when doing QSY by 10 Hz(!) so it
would work on MF without a problem.<br>
<br>
Actually a good idea to build it here for MF too. One could use a
simple CAT5 cable to bring the DC voltage coming from the phase meter
to the shack and to bring the motor supply voltage back to the coil. If
i would be a mircocontroller 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>
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