14.4.7 Swap transmitter/VSWRmeter and powermeter/dummyload on the cables. Repeat the adjustment with the other link.
14.4.8 Swap instruments again, and measure the VSWR. Keep correcting alternately both links until BOTH sides have an INPUT-vswr of 1:1.
14.4.9 Note how much the marking of each link is above topplate "A". This gives an idea how much of the link is in the cavity. It helps adjustment to final VSWR and finding the pre-adjustment for the other cavities.
14.4.10 When BOTH links have a VSWR of 1:1, and the position of the marks on the links is noted, loosen the coupling of both links a little (lift-up the links), and measure and correct alternately VSWR in both directions, until the VSWR on BOTH sides is equal and abt. 1:1.2.
14.4.11 Check the insertion-loss of the cavity. It should be less then 1 dB.
IMPORTANT: FROM NOW ON DO NOT CHANGE THE POSITION OF THE ADJUSTED LINKS UNDER ANY CIRCUMSTANCES. THE POSITION NOW (A LITTLE UNDER-CRITICAL TO A VSWR OF 1:1.2) IS OPTIMAL! THE ADJUSTED COUPLING HAS INFLUANCE ON ALL PROPERTIES OF THE CAVITY.
14.4.12 So, before going on, LOCK THE LINKS IN PLACE, by fixing the "hot" side of each link to topplate "A" with slow hardening 2-component glue. Harden in abt 30 min. by applying some heath.
This cavity is now ready to be used as a bandpass-cavity. It can be changed to a notch-filter by adding an extra component.