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transmitter power attenuator

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rv8iator(at)gmail.com
Guest

Posted: Sat Apr 06, 2013 11:30 am Post subject: transmitter power attenuator

I saw a recent post from Bob discussing using a 100 ft piece of coax connected to the comm antenna serving as an attenuator allowing for bench testing of a comm radio (xmit) without connecting to a conventional antenna. 



My question is, will this also work for a transponder? Â 

I am testing a new panel but do not have any antennas mounted to the the airframe and need to verify proper operation of each radio. Â I do have a dipole antenna (tuned for 118-136 Mhz) mounted on the roof of the shop I use for testing operation of the comms. Â But I haven't found anyÂ procedure for testing the transponder and ADS-B UAT which are 1090 Mhz and 978 Mhz without using their respective antennas.

 



Chris Stone

RV-8

GNS 430, AFS EFIS, Navworx ADS-B, Val comm, PMA 4000



  [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Apr 06, 2013 2:18 pm Post subject: transmitter power attenuator

At 02:30 PM 4/6/2013, you wrote:

 	  Quote: 	
		  I saw a recent post from Bob discussing using a 

100 ft piece of coax connected to the comm 

antenna serving as an attenuator allowing for 

bench testing of a comm radio (xmit) without 

connecting to a conventional antenna.



My question is, will this also work for a transponder? Â


	


   Even better yet. Attenuation at 1050 is a LOT higher

   than at 126.

 	  Quote: 	
		  I am testing a new panel but do not have any 

antennas mounted to the the airframe and need to 

verify proper operation of each radio. Â I do 

have a dipole antenna (tuned for 118-136 Mhz) 

mounted on the roof of the shop I use for 

testing operation of the comms. Â But I haven't 

found anyÂ procedure for testing the transponder 

and ADS-B UAT which are 1090 Mhz and 978 Mhz 

without using their respective antennas.


	


    Hmmmm . . . that's a bigger problem and I'm

    not conversant with those systems. Waaayyy back

    when I used to have one of those AirSport eavesdroppers to

    check a transponder for gross functionality. You could

    lay a 110v drill motor on the ground under the xponder

    antenna and tie it into the ON position with a rubber

    band.



    Noise from the motor would tickle the transponder

    into fits of apoplexy . . . it would begin to

    squirt out mode c replies which could be read

    on the AirSport faceplate.  Kinda handy sometimes.



    But all that newfangled stuff . . . I don't know.

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Apr 06, 2013 5:36 pm Post subject: transmitter power attenuator

Here's the AirSport Corporation electro-whizzy. Looks

like they are still in business. Haven't had any direct

contact with them in 10-15 years.



http://tinyurl.com/ca8mgkv





   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Apr 06, 2013 5:49 pm Post subject: transmitter power attenuator

Here's the AirSport Corporation electro-whizzy. Looks

like they are still in business. Haven't had any direct

contact with them in 10-15 years.



http://tinyurl.com/ca8mgkv





   Bob . . .

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BobsV35B(at)aol.com
Guest

Posted: Sat Apr 06, 2013 6:08 pm Post subject: transmitter power attenuator

Good Evening Bob, 

  

 I bought one a year or so ago. The main thing I use it for is to be sure  what my transponder is sending to the FEDs.. I set it on top of my glareshield  and I can see what my stuff is telling the FED!

  

 I like it, but would prefer that it be smaller. 

  

 Happy Skies,

  

 Old Bob

  

  In a message dated 4/6/2013 8:50:35 P.M. Central Daylight Time,  nuckolls.bob(at)aeroelectric.com writes:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "Robert L. Nuckolls, III"    <nuckolls.bob(at)aeroelectric.com>



Here's the AirSport Corporation    electro-whizzy. Looks

like they are still in business. Haven't had any    direct

contact with them in 10-15    years.



http://tinyurl.com/ca8mgkv





   Bob .    . . 



	


 [quote][b]

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Tundra10

Joined: 14 Jun 2010
Posts: 102
Location: Scarborough, Ontario

Posted: Sun Apr 07, 2013 6:01 am Post subject: transmitter power attenuator

 	  Quote: 	
		   From: Christopher Cee Stone <rv8iator(at)gmail.com>

 But I haven't found any procedure

 for testing the transponder and ADS-B UAT which are 1090 Mhz and 978 Mhz

 without using their respective antennas.


	


Zaon makes two portable collision avoidance systems, the MRX and XRX.   

Likely a local pilot will have one of these you could borrow.



Both will display the transponder code and altitude of what it is  

transmitted by the local transponder.



Jeff Page

Dream Aircraft Tundra #10

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 07, 2013 6:44 am Post subject: transmitter power attenuator

At 09:07 PM 4/6/2013, you wrote:

  	  Quote: 	
		   Good Evening Bob, 

  

 I bought one a year or so ago. The main thing I use it for is to be sure what my transponder is sending to the FEDs.. I set it on top of my glareshield and I can see what my stuff is telling the FED!

  

 I like it, but would prefer that it be smaller. 	


   If the original designer/manufacturer were still

   in business, it might have become smaller by now.

   I met Daryl and Pat Phillips in OSH about 1990.

   Their mom-n-pop business in Salisaw OK was rather

   young then. Daryl was the one and only designer and

   software writer. He was using Motorola 6800 series

   chips as I recall.



   The thing uses a rather large battery.



   They sold the business to one of their employees

   some years ago. To be sure, more modern processors,

   components and materials offer opportunity for

   shrinking the size down . . . and even making it run

   on three or four AA cells. But I don't think

   that's going to happen now.



   It IS a pretty slick gizmo.



 

   Bob . . .    [quote][b]

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rv8iator(at)gmail.com
Guest

Posted: Sun Apr 07, 2013 12:28 pm Post subject: transmitter power attenuator

Bob, Bob et al,Thanks for the info... Â My primary concern at this time was to insure I wouldn't damage the xponder upon power up if IÂ inadvertently hit the ident button. Â As far as test equipment goes the shopÂ shouldÂ be able toÂ verifyÂ operation when I getÂ my pitot/static check. Â The ADS-B checkout is another matter. Â The Navworx box does have a self test that validates it is receiving the serial data from the Â  alt. encoder and displays the output on the EFIS screen. Â Still need to learn theÂ procedure for validating communication with the ground station. Â The technology is still in it's infancy as the FEDs are in process of adding ground stations to re-transmit traffic and weather data. Â I'm still learning.. but that's the idea isn't it! Â 

 



Chris



On Sun, Apr 7, 2013 at 6:49 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 [quote]  At 09:07 PM 4/6/2013, you wrote:

  	  Quote: 	
		   Good Evening Bob, 

 Â 

 I bought one a year or so ago. The main thing I use it for is to be sure what my transponder is sending to the FEDs.. I set it on top of my glareshield and I can see what my stuff is telling the FED!

 Â 

 I like it, but would prefer that it be smaller. 	




 Â  If the original designer/manufacturer were still

 Â  in business, it might have become smaller by now.

 Â  I met Daryl and Pat Phillips in OSH about 1990.

 Â  Their mom-n-pop business in Salisaw OK was rather

 Â  young then. Daryl was the one and only designer and

 Â  software writer. He was using Motorola 6800 series

 Â  chips as I recall.



 Â  The thing uses a rather large battery.



 Â  They sold the business to one of their employees

 Â  some years ago. To be sure, more modern processors,

 Â  components and materials offer opportunity for

 Â  shrinking the size down . . . and even making it run

 Â  on three or four AA cells. But I don't think

 Â  that's going to happen now.



 Â  It IS a pretty slick gizmo.



 

 Â  Bob . . .     	  Quote: 	
		  



ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


[b]

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rv8iator(at)gmail.com
Guest

Posted: Sun Apr 07, 2013 12:57 pm Post subject: transmitter power attenuator

Jeff,



Thanks... Â Great tip! Â I think my local FBO has them in a couple of rentals. Â 

chris



 On Sun, Apr 7, 2013 at 7:00 AM, Jeff Page <jpx(at)qenesis.com (jpx(at)qenesis.com)> wrote:

[quote] --> AeroElectric-List message posted by: Jeff Page <jpx(at)qenesis.com (jpx(at)qenesis.com)>

 

  	  Quote: 	
		   From: Christopher Cee Stone <rv8iator(at)gmail.com (rv8iator(at)gmail.com)>

 But I haven't found any procedure

 for testing the transponder and ADS-B UAT which are 1090 Mhz and 978 Mhz

 without using their respective antennas.

 	
 

 Zaon makes two portable collision avoidance systems, the MRX and XRX. Â Likely a local pilot will have one of these you could borrow.

 

 Both will display the transponder code and altitude of what it is transmitted by the local transponder.

 

 Jeff Page

 Dream Aircraft Tundra #10

 

 

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 ric-List" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

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 t="_blank">http://www.matronics.com/contribution

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