Today's Message Index:
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1. 06:29 AM - Garmin GNC250XL wiring (Remi Guerner)
2. 06:49 AM - Re: Garmin GNC250XL wiring (GTH)
3. 08:16 AM - Re: Garmin GNC250XL wiring (bigdog@bentwing.com)
4. 08:49 AM - Re: Garmin GNC250XL wiring (David Lloyd)
5. 09:14 AM - Re: Garmin GNC250XL wiring (Remi Guerner)
6. 09:23 AM - Re: Garmin GNC250XL wiring (Remi Guerner)
Message 1
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| 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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=463938#463938
Message 2
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| Subject: | Re: Garmin GNC250XL wiring |
Le 15/12/2016 15:29, Remi Guerner a crit :
> /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
Message 3
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| Subject: | Garmin GNC250XL wiring |
The GX-60 and SL-30 both have 2 power inputs, one for the comm board and th
e other for the nav. One of them powered the display, I don't remember whic
h. Those were UPSAT designs but Garmin had to make a choice for display pow
er as well. Hopefully it's the nav side in your unit.
Greg Young
From: owner-avionics-list-server@matronics.com [mailto:owner-avionics-list-
server@matronics.com] On Behalf Of GTH
Sent: Thursday, December 15, 2016 8:50 AM
Subject: Re: Avionics-List: Garmin GNC250XL wiring
Le 15/12/2016 =E0 15:29, Remi Guerner a =E9crit :
I would like to deactivate the com circuitry so that it does not use more p
ower than necessary. According to the Install Manual, the unit is powered a
s 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 requir
ed 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 wil
l 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 aircra
ft pwr & ground connections often use two pins and two wires each, which ar
e internally interconnected.
So leaving one of them un-connected won't change the VHF standby power, whi
ch is usually quite low.
FWIW,
--
Amicalement,
Gilles
http://contrails.free.fr
Message 4
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| Subject: | Re: 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.
__________________________________________________________________
----- Original Message -----
From: "Remi Guerner" <air.guerner@orange.fr>
Sent: Thursday, December 15, 2016 6:29 AM
Subject: Avionics-List: Garmin GNC250XL wiring
> <air.guerner@orange.fr>
>
> 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
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=463938#463938
>
>
>
---
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Message 5
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| 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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=463947#463947
Message 6
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| 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]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=463949#463949
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