VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-14
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 02-06-2019, 11:31 PM
Av8rRob's Avatar
Av8rRob Av8rRob is offline
 
Join Date: May 2005
Location: Rescue, CA. KROB
Posts: 266
Default

Walt, just curious why the g3x screens would not share a dimmer with the gtn? It would seem that the three screens would all go together.
__________________
Rob Lasater
Rv-14 still workin
Paid nov 2018
Reply With Quote
  #12  
Old 02-07-2019, 06:47 AM
kbalch's Avatar
kbalch kbalch is offline
 
Join Date: Jan 2005
Location: Clermont, FL
Posts: 354
Default

Quote:
Originally Posted by Av8rRob View Post
Walt, just curious why the g3x screens would not share a dimmer with the gtn? It would seem that the three screens would all go together.
My thought exactly. Iím very curious about the reason for separating them.
__________________
Ken

RV-8 N118KB (sold)
RV-14A N114KB (#140494)
FWF in progress
Reply With Quote
  #13  
Old 02-07-2019, 07:21 AM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,186
Default

Quote:
Originally Posted by Av8rRob View Post
Walt, just curious why the g3x screens would not share a dimmer with the gtn? It would seem that the three screens would all go together.
Quote:
Originally Posted by kbalch View Post
My thought exactly. Iím very curious about the reason for separating them.
Well the large screen sizes of the G3X/GTN can overwhelm a dark cockpit, so having individual precise control of these 2 major light sources indepently works best for me.

Granted, with enough programming effort, they could work off the same pot, but its much easier IMO to just put in sepertate pots.
Ever try adjusting the lighting curve while actually flying at night... not happening for me.
__________________
Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
Reply With Quote
  #14  
Old 02-07-2019, 07:27 AM
kbalch's Avatar
kbalch kbalch is offline
 
Join Date: Jan 2005
Location: Clermont, FL
Posts: 354
Default

Ah, I see what you mean. Given that my GTN750 screen isn’t that much smaller than the G3X screens, I think I’ll keep them linked to a single dimmer.
__________________
Ken

RV-8 N118KB (sold)
RV-14A N114KB (#140494)
FWF in progress
Reply With Quote
  #15  
Old 02-07-2019, 07:55 AM
KeithB KeithB is offline
 
Join Date: Mar 2014
Location: Granbury, TX
Posts: 212
Default

Ken Balch, yes - that is correct. Using the GAD 27 makes it possible to control separate circuits with a common dimmer. With the GAD 27, each pot provides a reference voltage back to the GAD 27. The 27 then has 2 lighting control circuits off each - one is a "conventional DC voltage of 0-12 volts and the other is a PWM (pulse width modulation) for controlling LEDs. Each has a separate programmed profile. DC circuits are used by the G3X and GTN for lighting control inputs. For LEDs, the GAD 27 is wired on the ground side. So the "panel lights" circuit comes from one switch, then the red glare shield LED, and to the GAD 27 controlled circuit (ground). The "cabin lights" circuit comes from its switch, then the white glare shield LED, and to the same GAD 27 controlled circuit (ground) - so one dimmer, 2 circuits. The method also allows a baggage LED light to be powered off the same switch (cabin) but grounded through a separate switch in the baggage area and not dimmed.

Also,regarding the screens, I have the G3X and GTN 650 on the same circuit and found it easy to balance intensities. Adjusting the brightness is done in the setup (GTNs have an internal profile). Rather than setting it in the air, I did it on the ground in a darkened hangar.
__________________
Keith Brown

RV-14A Builder - kit #136, XP-400 Aero Sport Power
N314KC - First flight Mar 8, 2017, 24th in the air, >450 hrs
RV-6A sold
Sport Pilot (weight-shift control) - Airborne XT912
Dues paid 12/2018

Last edited by KeithB : 02-07-2019 at 07:58 AM.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:00 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.