Here is a simple example. We should shorten the coax part of the matching stub by 5.960 if we want optimum results. To find the length, follow this formula. Subtracting 1.5 feet from the 22.5 foot stub yields 21.0 feet. Add the Line IsolatorsTM and the stub is again 900.
Phase delay exists in all baluns and similar devices.
We give you the numbers to take advantage of it. The rated frequency is 3.5 MHz. Duty-cycle is CW or SSB with normal processing. High duty cycle modes, like RTTY, may over stress a balun and require improvement in load matching, lowering the power, or switching to a higher rated balun. When a ferrite core balun saturates, you will notice an upward drift in SWR long before the balun fails.