[R-390] Collins Mechanical Filter History

[Llgpt at aol.com]

This was cut n' pasted from their page:
 
The highest volume application of mechanical filters in those days was in  
the R-390. Each radio used four mechanical filters. Originally designed at  
Rockwell Collins in 1955, the R-390 was later built by many different companies,  
mostly as the R-390A. The total production volume of R-390As was more than  
65,000 radios.
 
It certainly doesn't demonstrate "why" the "generic term" R-390 is used.  
Their information isn't anywhere close to being accurate regarding the numbers  
built unless they are inlcuding the R-390 in with the R-390A. 65,000??? I don't 
 think so! But, if you include the R-390's and R-390A's, it comes to more 
than  70,000+ radio receivers. So much for "historical accuracy."
 
Ahhhh, engineers................., reminds me of the saying an old engineer  
friend of mine told me:
 
"Having a college degree and legitimate parents doesn't mean you can't  be a 
dumb bastard."
 
 
In a message dated 6/3/2005 11:51:24 AM Central Daylight Time,  
w5or at comcast.net writes:

Interesting info from Rockwell.  Some of the details don't jive  with our
lore.  Also demonstrates why using the generic term, "R-390",  is endemic to
our list culture, and  necessary.

<http://www.rockwellcollins.com/about/additionalproducts/collinsfilters/page
1907.html>

If  the link above is truncated in your email program, go  to
www.collins-filters.com

Click the About Collins Filters  link
See the History section.


Hello to all the guys I met for  the first time at Dayton.  I still haven't
unpacked, nor looked at all  my notes.  

Don