Maybe you were thinking of a "Coaxial Line Stretcher"? Look at: <http://www.hirose.co.jp/cataloge_hp/e35500029.pdf>
These keep a constant impedance of 50 ohms, but allow you to adjust the length of the cable. 73, Joe, K1ike
Maybe you were thinking of a "Coaxial Line Stretcher"? Look at: <http://www.hirose.co.jp/cataloge_hp/e35500029.pdf>
These keep a constant impedance of 50 ohms, but allow you to adjust the length of the cable. 73, Joe, K1ike