John, Firstly build your loop with your chosen capacitor and see how much Q you can achieve. From there you can work out by how much (or how little!) you have to rotate the shaft per kHz of change. This will then dictate how you computer control your loop.
Unfortunately you need to start at the other end of the project first and work backwards to find the right motor and gearbox. Transmitting loops with high Q can be fiddly to tune and then hold in tune, especially when they are only 3kHz wide. 73 Matthew VK5ZM On 28 October 2016 at 12:36, johnpierce <[email protected]> wrote: > I have seen general definitions about motors for driving a capacitor in Mag > Loop. But I have not seen a recommendation of a specific type to look for > on Amazon or Ebay. For starters I am looking for a 12vdc reversible motor. > I would like to start with a simple push button system for tuning. Maybe I > will consider a stepper later. I think that would need some computer > control. I am also wondering what RPM to consider for use on the lowest > frequency (40mtrs). The capacitor I am expecting to use would not have a > stop and could travel a full 360 degrees. > > > > John > > Ad2F > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
