About Radio 61 Variable capacitor drive mechanism concept for antenna tuning скачать в хорошем качестве

About Radio 61 Variable capacitor drive mechanism concept for antenna tuning

I want a mechanism that can be used with either continually rotatable capacitors or 180 degree movement capacitors for antenna tuning applications. In this video I show you the design concept I have for a cheap and very simple variable capacitor drive mechanism that uses a small low voltage low RPM DC motor that doesn't require any electronic control gear, limit switches or slipping clutch mechanisms. All it requires is a reversing switch at the operators end and two wires to the motor. One of the wires could be the screen of the coax and if I get really adventurous I may even make a filter so I can separate the DC from the RF and just used the coax to drive both the motor and carry the radio signals to and from the antenna. I will make the real thing and when it's up and running I'll post it on YouTube and I'll put a link in this box to the new video. I hope you find this helpful, I couldn't find any other mechanism as simple as what I've come up with (for 180 degree capacitors) as they all seem to require complicated switching arrangements or stepper motors with all of the added complication and expense that they involve. If you come across a mechanism that does a similar job without a shed load of control gear do feel free to let me know about it and please don't forget let me have your comments. Thanks for watching, let me know if you decide to build such a device. Thanks for watching Kind Regards ... Andy GWØJXM Update ...15 Nov 2012 First ... sorry about the spelling mistakes in the video, not my strong point, sometimes when I copy and paste text into the video editor I miss the fact that the spell checker has decided to change 'as' to 'is' (or something like that) Second ... I requested the torque specification for these motors from the eBay supplier and I very quickly received the following information. 12 V 3 RPM, Rated torque :2kg.cm 3 V 5 RPM, Rated torque :0.8kg.cm 3 V 30 RPM, Rated torque :0.5kg.cm By the way all of the other information about the motors is/was available on the sellers site. The sellers eBay name is xyfs-us