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02-11-2014, 10:21 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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Step up converter 14 to 28v for GNS
Is there any reason why I cannot use a step up converter for a GNS 430. I see many of the 28v only versions come up for sale on eBay and was wondering if I could use a step up converter if I purchased one.
If so...any specific recommendations on the converter.
thanks
__________________
Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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02-11-2014, 11:03 AM
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Join Date: Jun 2007
Location: Rhode Island
Posts: 937
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I would look into the cost to replace the power supply electronics with a 14V version before looking into an external step-up converter. Don't know if that's possible, but I would expect that there would be a bunch of separate printed circuit boards and power supply components and that swapping out some stuff would result in a 14V version. Might void the TSO and present some serial number issues, and if so maybe Garmin would do a conversion like that? Who knows, maybe it's just some DIP switches that makes the difference between a 14V and 28V version...
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Highest Regards,
Noah F, RV-7A
All men dream, but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men? for they may act their dream with open eyes, to make it possible. -T.E. Lawrence
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02-11-2014, 01:06 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by Noah
I would look into the cost to replace the power supply electronics with a 14V version before looking into an external step-up converter. Don't know if that's possible, but I would expect that there would be a bunch of separate printed circuit boards and power supply components and that swapping out some stuff would result in a 14V version. Might void the TSO and present some serial number issues, and if so maybe Garmin would do a conversion like that? Who knows, maybe it's just some DIP switches that makes the difference between a 14V and 28V version...
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Well, Garmin doesn't support the 28V version anymore so I doubt they would be any help.
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Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
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02-11-2014, 01:14 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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Quote:
Originally Posted by Don Jones
Well, Garmin doesn't support the 28V version anymore so I doubt they would be any help.
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.... which answers the question as to why so many are showing up on Ebay... 
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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02-11-2014, 04:05 PM
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Join Date: Jun 2007
Location: Merritt Island, FL
Posts: 602
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Step up converters can be very noisy, spewing out a lot of EMI if not well shielded and filtered.
Other than that, find a unit that will provide the desired power. Use shielded wire, grounded at one end only, and possibly add a .01 uF COG ceramic capacitor at the input to the Garmin's power supply input.
Note, too, that the input current to the power supply will be more than twice that required by the Garmin. So, if the Garmin is using 5 A at 28 V, the power supply will probably draw around 11 to 12 A at 14 volts.
__________________
Jeff Rosson
Repeat Offender
RV14 - Working on Empennage/Tail Cone
RV9A - Completed! First flight on July 18, 2012!
Based at Merritt Island, FL (KCOI)
VAF Number: 1170
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Star Trek Quote: "Logically, it could work. Also, logically, there are a hundred variables, any one of which could put us in a worse position than we're in now." Mr. Spock in Return to Tomorrow
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