[R-390] Wullenwebber information Project Boresight

[Lester Veenstra]

This is the first time I have seen a discussion of TH in the clear.

Lester B Veenstra  MØYCM K1YCM
lester at veenstras.com
m0ycm at veenstras.com
k1ycm at veenstras.com
 

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Curt Nixon
Sent: Sunday, March 06, 2011 2:39 PM
To: Dave or Debbie Metz
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] Wullenwebber information Project Boresight

Dave:

Thanks..

That was a very interesting article.  As a High School Extra Class, I 
was recruited for work in Gander and Greenland in the mid-sixties.  
Probably some of that equipment.  It would be very interesting to see 
some technical docs/photos of the receiver banks and antenna arrays but 
I suppose cameras were a capitol offense!

Curt
KU8L





Dave or Debbie Metz wrote:
>   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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