Indeed, being able to talk to a remote tuner without adding extra control lines is desireable and can be achieved.
One method, which I used in a 1950s vintage homemade link coupled remote tuner, makes use of "frequency sensitive" relays in the remote tuner to control the tuner's band switching tasks, along with a simple servo arrangement which tunes the motor driven variable capacitors for minimum SWR as seen at the coax's connection to the link circuit during Tune. Although the DC power required could be fed via the coax, I opted to use a separate cable. I believe that because the ICs used to generate audio tones and to decode audio tones are so inexpensive these days, controlling remote devices by means of audio tones sent down the coax feeder might be a better option. The use of Fibre Optic in lieu of copper to carry multiple control tones is an option I have been pondering for use in the future, but probably too expensive for a commercial product. 73, Geoff GM4ESD On April 08, 2011 at 7:45 PM, Mike Fatchett wrote: <snip> > I would like to see multiple antenna inputs for the tuner and a way to > specify which one is used on which band. > > A number of people have suggested a weatherproof unit for placement > directly at the antenna feed. In this setup extra inputs might be > wasted unless you ran your other feeds over to the tuner. Talking to > the remote tuner without extra control lines might be a challenge. > > A wattmeter and SWR meter should probably be part of the unit. > > I will be curious to see what the enclosure will be as I hope to take > one to J6 in November. I am not sure that the tuner could be made much > smaller than the K3 enclosure. Using the same enclosure is cheaper in > the long run and matches the the K-line ascetically. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
