[Milsurplus] [Vintage-Military-RADAR] Re: puzzler - module with glass rod?

[antqradio at sbcglobal.net]

Interesting puzzle.  Don't know much about delay lines besides the obvious but all that I have ever seen have two ports.  But Z1 looks to me to have only one port.  Wouldn't one need some sort of a circulator / isolator to separate input from output if it is a delay line?  
Still looks to me like a high Q dielectrically loaded resonate cavity, so it is much smaller then an unloaded cavity for the same resonate frequency.  Could be used as a pulse stretcher in that the cavity might ring for a while after the input pulse has passed.  Perhaps this is a MTI / Ground Clutter removal module?Jim

      From: Michael Hanz <aaf-radio-1 at aafradio.org>
 To: Vintage-Military-RADAR at yahoogroups.com; Military Surplus Mail List <milsurplus at mailman.qth.net> 
 Sent: Sunday, April 3, 2016 12:28 PM
 Subject: Re: [Milsurplus] [Vintage-Military-RADAR] Re: puzzler - module with glass rod?
   
 Looks like a barium titanate transducer glued to the end of a fused quartz rod, normally used in broadband delay lines with a transducer at each end.  Unterminated, it might be used as a delayed pulse generator of some sort, I suppose.  The center frequency can be quite high - see http://patentimages.storage.googleapis.com/pages/US2861247-0.png
 
  - Mike  KC4TOS
 
 On 4/3/2016 10:40 AM, Nick England navy.radio at gmail.com [Vintage-Military-RADAR] wrote:
  
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  http://www.navy-radio.com/puzzlers.htm#glass
 I've just added some more photos. This glass rod appears to have a single contact to a ceramic(?) button attached to its base. Maybe some sort of piezo transducer with the rod acting as a resonant filter? What's it doing in something that otherwise appears to have VHF(?) coils and trimmers. Is it some sort of radar pulse processor thingie?
 The rod assembly is labeled Z1 on the components diagram.
 
  Oh yeah, free to a good home...
 
 cheers,
  Nick the curious
  www.navy-radio.com 
    
 
 __._,_.___   Posted by: Nick England <navy.radio at gmail.com>    
 
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