Message-ID: <5633C6F8.4080807@posteo.de>
Date: Fri, 30 Oct 2015 20:37:28 +0100
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <1981852865.20151017122027@chriswilson.tv> <1530BFEB-9BC2-4CA2-A7A3-338629A98202@me.com> <308511169.20151029202607@chriswilson.tv> <56328B1F.2080901@posteo.de> <12510142154.20151030112719@chriswilson.tv>
In-Reply-To: <12510142154.20151030112719@chriswilson.tv>
Subject: Re: LF: Automatic variometer circuit
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Status: O

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
>>      
>
>
>
>
>
>
>
>