[R-390] The R-725 and the DF story?

[Richard M. MC Clung]

If you want to know where the R-725 was used you can see it all in TM
11-5825-231-10, Direction Finder Set AN/TRD-15/23.

The fact is that the mechanical filters caused phase distortions which
provided for inacurate bearing readings in the goniometers.

RICH  WA6KNW