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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