Hi Chris,
My motor draws about 200 mA at 12V. It has about 1 round per 3 seconds i
estimate. Costs are below 10 EUR. You will find something on ebay for
example.
I use end-switches in the construction BTW, see
https://dl.dropboxusercontent.com/u/19882028/LF/variometer%20end%20switches.jpg
just to prevent the wind-up of the cable, antenna wire, coax (would
sound like "crrrrrkftftftftftplingftftftftbuffftftftft...")
73, Stefan
Am 30.10.2015 12:27, schrieb Chris Wilson:
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
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