Hello Stefan,
Thursday, October 29, 2015
Now that looks interesting! Could I just ask what sort of current the
motor draws? And what sort of RPM it turns at and the gearing used, to
give me a guide as to what I need to look for please?
Thanks for posting the links.
> Hi Chris,
> Am 29.10.2015 21:26, schrieb Chris Wilson:
>> [...] albeit my loading coil needs manual
>> tweaking to move to the right part of the band. Not sure of the best
>> way to remote tune it, it would be nice to have the ability to move
>> about the band without running outside in the dark. I may start a
>> thread about what alternatives there are, thanks again Erwin
>>
> I'm using a motor driven variometer which uses the phase meter circuit
> of the M0BMU LF tuning meter. It is working well on LF, where my antenna
> resonance is so sharp that i have to re-tune when doing QSY by 7 Hz.
> See:
> https://dl.dropboxusercontent.com/u/19882028/LF/LFtunemeter.pdf
> https://dl.dropboxusercontent.com/u/19882028/LF/DK7FC%20Automatic_variometer_tuner%20.jpg
> https://dl.dropboxusercontent.com/u/19882028/LF/automatic_variometer_board.jpg
> https://dl.dropboxusercontent.com/u/19882028/LF/LF_variometer_drive_engine_arrangement.jpg
> https://dl.dropboxusercontent.com/u/19882028/LF/phase_meter.jpg
> 2011 was a nice LF year for me!! :-)
> 73, Stefan
--
Best regards,
Chris mailto:[email protected]
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