i have a few rolls of 7/8 if anyone is in need mid mich area ill never use all i have ..mike n8obu
-- In [email protected], Paul Kelley <[EMAIL PROTECTED]> wrote: > I've used 75 ohm line for everything from repeaters to > moonbounce. Years ago I used to make the quarter wave > matching sections out of copper/brass tubing, and they > worked fine. But for the last several years I just cut the > line to provide low SWR. Assuming your antenna is close to > 50 ohms, you can repeat that at the other end of a 75 ohm > line by cutting the line to an exact multiple of a > (electrical) half wavelength. I do this experimentally. For > 2 meters I start with the line about 3 feet longer than it > needs to be to reach wherever I want it terminated (one > foot will do for 440). Once it is connected to the antenna > I then start trimming it an inch or so at a time (at the > other end) and checking SWR until it is very low (trim in > smaller increments on 440 !!). Then use a random length 50 > ohm jumper from the end of the 75 ohm hardline to the > duplexer/radio or whatever. With this approach you can use > either 75 or 50 ohm cable for a flexible jumper at the > antenna end. Of course this only works on one band, but the > same can be said of the quarter wave transformers! This > method takes a little time and patience, but I haven't had > a problem with it yet. > > Paul N1BUG Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
