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Garmin GNC250XL wiring

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Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Thu Dec 15, 2016 6:29 am Post subject: Garmin GNC250XL wiring

Hello all,

I am installing a new com radio in order to comply with the european requirement for 8.33 channel spacing. I do not need the com function of my GNC250XL anymore as I will use it as a GPS only. I would like to deactivate the com circuitry so that it does not use more power than necessary. According to the Install Manual, the unit is powered as follows: connector J101: pins 21 and 25 connected to aircraft power. Pins 22 and 26 to ground. For pins 21 and 22, it is also mentioned: "not required for GPS150XL" . The GPS150XL is a GPS only variation of the 250XL. So I think that pins 21-22 may be feeding the com circuitry while pins 25-26 are feeding the GPS circuitry and if I do not connect pins 21-22, the unit will work fine as a GPS only. Am I right ?

Regards

Remi Guerner

Europa F-PGKL

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gilles.thesee(at)free.fr
Guest

Posted: Thu Dec 15, 2016 6:49 am Post subject: Garmin GNC250XL wiring

Le 15/12/2016 à 15:29, Remi Guerner a       écrit :

     

      	  Quote: 	
		          	  Quote: 	
		  I would like to deactivate the com circuitry so that it does not use more power than necessary. According to the Install Manual, the unit is powered as follows: connector J101: pins 21 and 25 connected to aircraft power. Pins 22 and 26 to ground. For pins 21 and 22, it is also mentioned: "not required for GPS150XL" . The GPS150XL is a GPS only variation of the 250XL. So I think that pins 21-22 may be feeding the com circuitry while pins 25-26 are feeding the GPS circuitry and if I do not connect pins 21-22, the unit will work fine as a GPS only. Am I right ?

	
     	
     Hi Remi,

     

     Don't know, but why not give it a try on the bench ?

     But be warned that as the VHF transmit function uses much power, the     aircraft pwr & ground connections often use two pins and two     wires each, which are internally interconnected.

     So leaving one of them un-connected won't change the VHF standby     power, which is usually quite low.

     

     FWIW,

     

     

     -- 

       Amicalement,

       Gilles

       http://contrails.free.fr

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gyoung

Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas

Posted: Thu Dec 15, 2016 8:16 am Post subject: Garmin GNC250XL wiring

The GX-60 and SL-30 both have 2 power inputs, one for the comm board and the other for the nav. One of them powered the display, I don’t remember which. Those  were UPSAT designs but Garmin had to make a choice for display power as well. Hopefully it’s the nav side in your unit. 

  

Greg Young 

    

From: owner-avionics-list-server(at)matronics.com [mailto:owner-avionics-list-server(at)matronics.com] On Behalf Of GTH

 Sent: Thursday, December 15, 2016 8:50 AM

 To: avionics-list(at)matronics.com

 Subject: Re: Garmin GNC250XL wiring 

 

 

   

Le 15/12/2016 à 15:29, Remi Guerner a écrit : 

  	  Quote: 	
		    	  Quote: 	
		  I would like to deactivate the com circuitry so that it does not use more power than necessary. According to the Install Manual, the unit is powered as follows: connector J101: pins 21 and 25 connected to aircraft power. Pins 22 and 26 to ground. For pins 21 and 22, it is also mentioned: "not required for GPS150XL" . The GPS150XL is a GPS only variation of the 250XL. So I think that pins 21-22 may be feeding the com circuitry while pins 25-26 are feeding the GPS circuitry and if I do not connect pins 21-22, the unit will work fine as a GPS only. Am I right ? 	
 	
 

Hi Remi,

 

 Don't know, but why not give it a try on the bench ?

 But be warned that as the VHF transmit function uses much power, the aircraft pwr & ground connections often use two pins and two wires each, which are internally interconnected.

 So leaving one of them un-connected won't change the VHF standby power, which is usually quite low.

 

 FWIW,

 

   

-- 

 Amicalement,

 Gilles

 http://contrails.free.fr

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skywagon

Joined: 11 Feb 2006
Posts: 184

Posted: Thu Dec 15, 2016 8:49 am Post subject: Garmin GNC250XL wiring

Remi,

If you do not have a backup radio, I personally, would not deactivate it.

Since it is already part of your panel why not keep it on-line as an 

emergency radio..?

And, it's receiver function can always be used as #2, listening for traffic 

on ATC, ground, weather, etc.



__________________________________________________________________



---

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Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Thu Dec 15, 2016 9:14 am Post subject: Re: Garmin GNC250XL wiring

Skywagon,

Keeping the GNC250 as a back up was my original plan, but I finally decided against it because that would be a more complex installation with an additional antenna and an audio panel. I also think that whenever the 8.33 channel spacing will be fully implemented, the European authorities will forbid any transmission on the old 25 MHz spacing frequencies to prevent interferences. My back-up is an 8.33 Icom hand held.

Remi

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Remi Guerner

Joined: 14 Dec 2010
Posts: 284

Posted: Thu Dec 15, 2016 9:23 am Post subject: Re: Garmin GNC250XL wiring

Hi Gilles,

Of course a bench test is a possibility. Now regarding the power requirements, here are the figures mentioned in the Manual:

GNC250XL: 1.35A (not transmitting). GPS150XL: 0.95A

So there is 0.4Amps to be saved with the deactivation of the Com board.

Regards

Remi



 [/quote]

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