[GreenKeys] 'Russian woodpecker' of old...

[sdaitch at kuw.ibb.gov]

> > If returns come back after you start transmitting again, 
> > you are not going to hear them. 
> Unless they return after that second "pulse" has stopped - 
> and the system is again "listening".
> > And significant returns from a previous (to the most 
> > recent) pulse are confusing and difficult to sort out. 
> This used to be true - however - modern RADAR systems employ 
> "staggered" PRRs to detect a return that past the 
> unambiguous range. By staggering the PRR - a target beyond 
> the unambiguous range "jitters" rather than being steady on 
> the display. Further - such returns can be processed by 
> computer and accurately placed at their correct range time 
> (distance).


It is my reading the BMEWS system was reprogrammed to eliminate
moon echoes.

http://www.electronicaviation.com/articles/Military/390

http://www.bwcinet.com/thule/4techdr.htm

go to the last paragraph.

73
Sheldon