Topband: flag/pennant transformers/terminations

[Ron Feutz]

Topbanders,

Pennants are 900 ohms and flags are 950 ohms.  Is there any practical 
concern about using a pennant-designed commercial box in a flag?
Do I gain or lose if I use a 950 ohm resistor with the 900 ohm box?

If I roll my own with K6SE's recommended FT 140-77 core, should I add 
another turn to the secondary, e.i. 3:14 instead of 3:13 (or some other 
ratio) ?

73,

Ron  WA9IRV