[R-390] Wullenwebber information Project Boresight

[Dave or Debbie Metz]

  Forgive me for crossposting but this R390 crowd has always talked 
about the problem with the phase shift of the mechanical filters.  After 
reading this article, I think its very clear why the Wullenwebbers were 
developed, and why NSA developed the R725 with the earlier 390 IF strip, 
and the DC to the PTO filaments. (And the R1230's among other Security 
group equipment) Not sure I have this exactly correct but in any case, 
it sure discusses something that is news to me.  I have seen the 
wullenwebbers in photos but had no idea as to the real purpose in life 
other than a real expensive HFDF system.  Sounds like we owe a big debt 
to some real geeky guys at NSA and Canada.

73's
dave

Here's the link:


http://jproc.ca/rrp/boresight.html


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Dave Metz   cell 540 292 8864
Debbie Metz cell 540 290 1614
Home:  540 885 7914
Realtor email: metzrealtors at gmail dot com