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mystery coax signal splitter

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ceengland7(at)gmail.com
Guest

Posted: Tue Feb 21, 2017 2:10 pm Post subject: mystery coax signal splitter

Can anyone positively ID this box? I'm guessing it's a VOR/ILS splitter, but the paper label disappeared at some point in the past. I hate to toss it if I can be confident in what it does.



Charlie

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Tue Feb 21, 2017 4:23 pm Post subject: Re: mystery coax signal splitter

Not only has the paper label disappeared, but so has the picture of the box.

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_________________
Joe Gores

ceengland7(at)gmail.com
Guest

Posted: Tue Feb 21, 2017 4:53 pm Post subject: mystery coax signal splitter

On 2/21/2017 4:05 PM, Charlie England       wrote:

     

      	  Quote: 	
		         Can anyone positively ID this box? I'm guessing         it's a VOR/ILS splitter, but the paper label disappeared at some         point in the past. I hate to toss it if I can be confident in         what it does.         

         

         Charlie

       

     --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com> (fransew(at)gmail.com)



Not only has the paper label disappeared, but so has the picture of the box.  



--------

Joe Gores



Duhh....



Hopefully it will be attached this time. A multitasker I am not.



Charlie

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nuckolls.bob(at)aeroelect
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Posted: Tue Feb 21, 2017 5:38 pm Post subject: mystery coax signal splitter

At 06:50 PM 2/21/2017, you wrote:

  	  Quote: 	
		  On 2/21/2017 4:05 PM, Charlie England wrote:

  	  Quote: 	
		  Can anyone positively ID this box? I'm guessing it's a VOR/ILS splitter, but the paper label disappeared at some point in the past. I hate to toss it if I can be confident in what it does. 	
	


   It may well be a VOR/GS splitter . . .



 [img]cid:7.1.0.9.0.20170221192723.05404fd0(at)aeroelectric.com.0[/img] 



 

 . . . albeit an ACTIVE one. These two devices appear to

 be TO-92 case transistors. This means that the critter

 needs power via some path . . . which is not obvious

 from the photo.  The upper and lower sets of tuneable

 inductors suggest vhf and uhf band-pass filters.



 It would take some time to 'reverse engineer' the

 circuitry by inspection . . . then one could bench test

 it to ascertain characteristics of the two pathways.



 Interesting . . . I've never crossed paths with such

 a device before.



 

 

   Bob . . .

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ceengland7(at)gmail.com
Guest

Posted: Tue Feb 21, 2017 6:57 pm Post subject: mystery coax signal splitter

On 2/21/2017 7:33 PM, Robert L.       Nuckolls, III wrote:

     

      	  Quote: 	
		         At 06:50 PM 2/21/2017, you wrote:

               	  Quote: 	
		  On           2/21/2017 4:05 PM, Charlie           England wrote:

                   	  Quote: 	
		  Can             anyone positively ID this             box? I'm guessing it's a VOR/ILS splitter, but the paper             label             disappeared at some point in the past. I hate to toss it if             I can be             confident in what it does. 	
       	
       

         It may well be a VOR/GS splitter . . .

       

       . . . albeit an ACTIVE one. These two devices appear to

       be TO-92 case transistors. This means that the critter

       needs power via some path . . . which is not obvious

       from the photo.  The upper and lower sets of tuneable

       inductors suggest vhf and uhf band-pass filters.

       

       It would take some time to 'reverse engineer' the

       circuitry by inspection . . . then one could bench test

       it to ascertain characteristics of the two pathways.

       

       Interesting . . . I've never crossed paths with such

       a device before.

       

       

                

             Bob . . .                Well, double Duhh...If I'd actually looked at that, I'd have known 

better to even send the message. I pulled an ancient LORAN out of the 

plane after I purchased it about 15 years ago.  I wonder if this could 

be residue from that installation. Obviously, it's not a VOR/GS 

splitter, so it's very unlikely to be of any use to me.



Thanks for the good eye,



Charlie

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Feb 22, 2017 11:06 am Post subject: mystery coax signal splitter

 	  Quote: 	
		    	  Quote: 	
		  	
Well, double Duhh...If I'd actually looked at that, I'd have known better to even send the message. I pulled an ancient LORAN out of the plane after I purchased it about 15 years ago.  I wonder if this could be residue from that installation. Obviously, it's not a VOR/GS splitter, so it's very unlikely to be of any use to me. 	




   Aha! Yes. Those components were physically a

   bit 'horsy' for UHF/VHF circuity . . . but

   I'm at bit puzzled at how it might function

   as an add-on to a legacy aircraft. It couldn't

   be used to receive on a vhf comm antenna due

   to the need to also transmit throught the same

   path.  A VOR antenna with no frequency dependent

   features (like matching sections or baluns)

   MIGHT offer some performance at 100KHz LORAN

   levels . . . it's a puzzlement. 



 

 

   Bob . . .

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