Glen, Yes, you can certainly do that, and it should be quite efficient. You can bring open wire feeders or ladder line into the shack - the old timers did that all the time. The greatest problem is making the conductive path through the wall/window or other part of the structure. Replacing a piece of glass with plastic is often done, or with double hung windows, put a plastic panel beneath the lower sash and close the window on it. Don't forget to leave a drip loop at the point just outside, otherwise rain will drip into the dwelling.
Like any other, the feedline length will act as an impedance transformer (a tuner does the same thing with lumped components) - so the matching range required may be quite large for some feedline lengths. The switchable balun may help with that, but try to stay away from feedline lengths that produce a very low or very high impedances in the shack because the balun can become ineffective at impedances far removed from its nominal 50 ohm or 200 ohm design points. I will not give any specific antenna lengths and feedline lengths, but you can experiment with either the real antenna or do some work with the TLW software (download from ARRL website) to tell you what lengths will work for you. 73, Don W3FPR Glen Torr wrote: > Hello All, > > Following this thread with much interest. I need a stealth antena and > a doublet may do the job. > Could I feed my K3/100 with ATU into a BL2 right at the antenna > connector, the output of the BL2 > to home made ladder line, (2 to 4 inch spacing) to a doublet approx > 1/2 wavelength on the lowest > freq? > > Is it OK to bring ladder line into the shack? > > The 1:1 or 4:1 of the BL2 might provide matching options in difficult cases. > > Thanks for any thoughts, > > Glen VK1FB > > ______________________________________________________________ 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
