Tag Archives: transmission

Transmission Lines

I have an article brewing in me which is all about matching a low dipole for 160m to regular 50 ohm transmitter. The dipole I had in mind will be about 15 meters off the deck. My impedance will be about 20 ohms, maybe 25 if I can get it a bit higher. Basically, this is unnaceptable to me since I like to match things nicely.

Chris (G0EYO) sent me this link http://www.qsl.net/w4sat/qtrwavtr.htm¬†which tells me that I need to insert a quarter-wave piece of coax that has an impedance of 35 ohms. Well, I don’t know about you, I don’t often have 35 ohm coax lying around, however a pair of 75 ohm quarter wave stubs will reduce the impedance of 75 ohms to 37.5 ohms. Near enough? I think so.

Thanks Chris, I think I worked it out now.