So you actually come up with an RL value and equate to an IL value? lh
On Wed, Apr 21, 2010 at 9:08 AM, hfarrenkopf <hfarrenk...@yahoo.ca> wrote: > > > Here is how you do it...... > Take a T connector and put it on one of the pass loops. Leave the other > loop unterminated. Adjust the loop position so that the notch depth is about > 9dB for 0.9dB IL through if I remember correctly - this is done like > measuring a notch cavity with the spectrum analyzer and tracking generator > on the T. Adjust the other loop the same way but ensure that the loops are > rotated the same way from the maximum coupling position as observed by the > weld mark on the loop (rotated clockwise or counterclockwise). Recheck the > first loop's depth and adjust so it is the same. This process makes the in > and out loops symmetrically tuned. Measure the pass insertion loss to ensure > you have the desired insertion loss. If not, readjust the loop's notch again > to a slightly different depth - more for less pass loss and less depth for > more insertion loss. > > Once both cavities are tuned to frequency, the cable length between them is > somewhat critical in length. With the correct length, the individual pass > curves add without the need to retune the frequency and the return loss > curve will show 2 dips approximately equal and above and below the pass > frequency. If you don't get 2.0dB IL with the 2 cans at 0.9dB, then the > cable is incorrect. > > Enjoy! > > >
