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Where to Mount My Straux ADS B and Antennas Inside Plane for my GRT EFIS (RV-7 Slider Spacific).

jackking123

Well Known Member
Patron
Not an EFIS question but how to mount my portable Stratux ADS-B and two small rubber duck antennas in a RV-7 Slider. The antenna mounting is the tricky part really.

I have a GRT Horizon EFIS (Horz 10.1). This is a RV-7 Slider. The dual band Stratus ADS-B receiver (not to be confused with the Stratus Foreflight one) is hardwired to EFIS and works GREAT on the bench. Stratux is portable, has two SMA (mini) RF connectors. The two rubber duckie antennas one for 970 and one for 1090 Mhz screw onto those direct. You can get a patch cable to extend the antenna, have the antennas remote mounted for a more permanent installation (I think?). Seems reasonable, as long as the cable is not a mile long. I am talking 1 to 2 feet max FYI I have a 5 volt power supply wired into panel to power it.

Stratux and Antenna locations (I am not external mounting the antennas) wild ideas.... (opine as you like but real world examples appreciated)
  1. Stratux behind Panel and Antennas off center roll bar strut
  2. Stratux behind panel and Antennas mounted in glare shield along the side of windscreen
  3. Stratux behind panel and Antennas under the engine cowl off bracket hanging on firewall (not a fan but throw out there)..
  4. Stratux in baggage compartment on side and Antennas directly mounted on Stratux and poking up above fuselage along Plexi.

Items 1, 2 and 3, there is plenty of room behind panel to mount the Stratux with great access (I have an access panel on right side of instrument panel). The issue is how to mount the antennas.

Item 4 seems straight forward. Cons longer power line and serial data wire runs, unit will be visible in baggage area, could be bumped into. Pros, less intrusive to vison through windscreen, easy access, less parts and good antenna placement. Note I have two Stratux, I still use one portable in planes I teach in suction cupped to windscreen or side window. Performance (TIS traffic, NEXTRAD weather) is very good. I already plan on the ELT, on baggage floor and antenna in baggage area. Exposing some of my equipment is the theme.

Writing all this helps. Leaning towards item 4 at this moment. If I can get a clever way to mount antennas forward that performs well I would be inclined to go with Startux behind panel. I think I can tolerate the two small rubber duckie antennas somewhere in my field of view, as long as they are not directly in line of sight. The baggage area would be out of sight (in flight normally) out of mind.

Any examples appreciated. Feel free to give me your opinions and ideas.... I love the traffic and weather on the EFIS, just sitting on bench. It works well, just sitting on kitchen table near a window. Than again I less than 14 miles as the crow flies from a primary Class B airport. Lots of traffic to see. BTW my Stratux has WiFi as well and it connects to my iPad as well even when hardwired to EFIS. So that is also nice.
 
I run a Stratux as a backup. It has the battery pack and long rubber duckie antennas.
I installed two Ram ball mounts either side. The right one holds the Stratux. Left holds my S6 Lite Tablet running AvareX. Works great. I love a totally independent backup. It's not IFR, but it provides more than enough information to fly VFR should the panel go dark. Also keeps the headset cable out of the way!
 
I run a Stratux as a backup. It has the battery pack and long rubber duckie antennas.
I installed two Ram ball mounts either side. The right one holds the Stratux. Left holds my S6 Lite Tablet running AvareX. Works great. I love a totally independent backup. It's not IFR, but it provides more than enough information to fly VFR should the panel go dark. Also keeps the headset cable out of the way!

Just one antenna? You have just 1090 Mhz, no UAT 978 Mhz?
At these freqs the antenna is only about 5 inches half wave.

AvareX is that a freebee software?
Does AvareX give your TIS traffic, NEXTRAD weather and moving map display?

 
For my GRT equipped plane, I mounted a Stratux behind the panel attached to a 'pass through' battery pack (charges and provides power simultaneously) wired to 5v power supply connected to the main buss. External GPS antenna on a shelf attached to the engine mount. This gave me the 'last chance' fail safe of having the Stratux attitude data going to my iPad psuedo-six pack display if I lost all the redundant electrical power I had in the plane while IFR.

I used the appropriate Y-splitter and adapters from eBay to connect the two mini antenna inputs to a single 978 optimized ball and stick antenna on the belly of the plane. That setup worked great for both 1090 and 978 input, but I figured I was most interested in 978 weather data so I optimized it for that.
 
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Just one antenna? You have just 1090 Mhz, no UAT 978 Mhz?
At these freqs the antenna is only about 5 inches half wave.

AvareX is that a freebee software?
Does AvareX give your TIS traffic, NEXTRAD weather and moving map display?

"Antennas" Stratux comes with either two short duckies or two long ones. Or you can add coax and remote the box. The longer antennas are about 8" and improved the reception.
Free. Yes. $5/mo for a slightly enhanced product or just a donation.
TIS. Stratux receives it and I think AvareX displays. I think.
NEXRAD. Same as above. Stratux.
Moving Map. Yes. All the charts you want to download.
Screenshot below. I turned off all the weather and radar because we have storms and the screen was pretty busy.
Screenshot_20260427_184507.jpg
 
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I mounted a Stratux on the side behind the co-pilot seat with the antenna bent in slightly to avoid the rear window inward curve. I only use it for backup to ForeFlight if my Skyview goes down, in which case I reach over and plug the Stratux USB cable into a power outlet. The offset mount is 3D printed and is attached with Velcro to the skin (the suction cups would not stay attached to the skin). https://www.printables.com/model/165313-stratux-offset-mount
RV12 Stratux Mount #1.JPG
 
Why hasn't anyone asked about the GPS antenna? The Stratux has an internal GPS antenna that has to be outside to get their signal. You can buy an external GPS antenna that has a cable and then mount the box anywhere, but I haven't read that you did that.
 
I mounted a couple of Delta Pop blade antennas on the belly, bought correct size/length coax on Amazon to reach.

Stratux box is mounted behind panel, along with power supply and just run a signal wire to the GRT.


That is a good idea Mr. Obvious. Ha ha. Kidding Mike. Yes put a real antenna outside where it belongs. You are right. I dismissed that early, Experimental guys want to hide antennas in all kinds of places they don't belong, Under Cowl (GPS), In Wing Tips (VOR, COM), In tail intersection fairing (ELT)... and inside the cockpit. I am not a fan of wing tip or under tail antennas.

I went with external TXPD and COM antenna. The large Garmin GPS antenna, thinking under cowl, or on top of glare-shield like some do. Frankly I'm not a fan of lumps and bumps all over the the glare-shield. Engine compartment might cook the antenna and reduce performance being close to engine, Electronic Ignition, Firewall. I might bite thee bullet and mount it on the top back of fuselage where it belongs.

An external ADS-B in antenna is best and will work best. However when I am other planes, stick the Stratux on side of wind-screen or side window, high or low wing, I see all kinds of traffic. I get ADS-B station WX 30-35 miles away easily.

when dealing with ADS-B direct (airplane to airplane) range is not an issue, ranges that are useful. ADS-B ground station range is another matter. Depends on altitude and where you are flying in country. There is enough ADS-B ground stations now ranges is not an issue, unless your ADS-B In antenna is really bad or in mountainous areas.

I may choose the obvious and correct solution you did, an external antenna on belly. That makes it easy... But I will give up 0.05 kts top speed. 🤣

Thanks for reminding me of the obvious... 😊 Investing too much time trying to be different or non standard, at some point might just not be worth it.
 
Why hasn't anyone asked about the GPS antenna? The Stratux has an internal GPS antenna that has to be outside to get their signal. You can buy an external GPS antenna that has a cable and then mount the box anywhere, but I haven't read that you did that.
Because I did not write about it, obviously.:unsure:😊 Ha ha.

Yes Pilot135pd: I know the Stratux well, have two: one scratch built long ago, still have still works great. The second is a Crew Dog branded turn key Stratux. Both use the standard case, raspberry pie, the good 978Mhz and 1090Mhz receivers, the good GPS. GPS module internal has integrated antenna and the SMA jack for the external hockey puck GPS antenna, which I also have. So what about it? I would rather not have another external GPS antenna. When I use it portable i rarely if ever use the external GPS antenna. The internal GPS antenna works fine in portable use.

If I put the Stratux behind and under the panel I will likely have to use the external antenna. The antenna could sit on glare shield, off to the side. These GPS hockey pucks are not big. but it is still more stuff.

If I put Stratux in baggage compartment, the internal GPS with integrated antenna will be sufficient, I know. As I said I have 2 Stratux units. One of for my RV-7 permanent fixed duty, I use the other as portable for use in planes I teach in, powered with battery pack or USB power cable from aircrafts instrument panel.

GPS signal is never an issue with internal antenna. Locks on quickly. Bottom line the Stratux ADS-B IN receiver will use it's internal GPS with it's internal antenna OR the external add on antenna as needed. Good point pilot135pd,

One PRO for the baggage compartment application, as I stated, direct rubber ducky antennas to Stratux. However there are other PROS and CONS to both under panel and out in open baggage area.

Can I remove the internal GPS card (ISB slot) and set it up for external GPS data? I think so but I don't feel motivated enough. It works so well with the existing internal GPS. If here is a plug and play card, and don't need to patch the firmware, I might consider it? Garmin's GDL ADS-B receiver is $900, and likely CANBUS. I am playing in the NON Proprietary World, Grand Rapid Technology, Stratux, ICOM, Trig... . I really like the Stratux ADS-B and have two, use what I have.
 
I mounted a Stratux on the side behind the co-pilot seat with the antenna bent in slightly to avoid the rear window inward curve. I only use it for backup to ForeFlight if my Skyview goes down, in which case I reach over and plug the Stratux USB cable into a power outlet. The offset mount is 3D printed and is attached with Velcro to the skin (the suction cups would not stay attached to the skin). https://www.printables.com/model/165313-stratux-offset-mount
View attachment 116234

I love it. I don't have a 3D printer or access to one. Hate to ask but... I WILL. Can you print me one? PM me if you can, pay for materials and shipping. I see the link has suction cups. Did you use mechanical fasteners or are those super strength better suction cups? My base line plan was make it out of metal, or use the factory mount and attach brackets to that. Yours looks awesome. Do you have other colors?

However regardless thanks for picture. It helps me visualize.

Question what year is your RV=12iS do you have? That is a monster tank from what I recall? Is that a bigger one. Is your a RV-12 UL or iS? Just curious. I am helping a friend with his RV-12iS...
 
Wasn't intended to upset you or ask for curriculum vitae. You're here asking basic questions about the other 2 antennas but didn't mention the GPS antenna so I thought I'd give a heads up just in case. No biggie, you have all the "obvious" answers already.
 
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There is enough ADS-B ground stations now ranges is not an issue, unless your ADS-B In antenna is really bad or in mountainous areas.

I may choose the obvious and correct solution you did, an external antenna on belly. That makes it easy... But I will give up 0.05 kts top speed. 🤣

Well, if you are familiar with Dayton NV, then the mountain comment will make you smile a bit. https://www.google.com/maps/place/D...try=ttu&g_ep=EgoyMDI2MDQyMi4wIKXMDSoASAFQAw==

And for a plane that cruises at 120 or so MPH------not worried about the drag :D

Just find out what works for you, do it, and move on------and enjoy :D
 
Wasn't intended to upset you or ask for curriculum vitae. You're here asking basic questions about the other 2 antennas but didn't mention the GPS antenna so I thought I'd give a heads up just in case. No biggie, you have all the "obvious" answers already.
Upset? Me... no no. Basic questions does not mean the person is inexperienced or ignorant. I see from my original post I did not mention GPS. My bad. Your comment, was fine but tiny bit patronizing? Not really but "Why is no one talking about....", "it has internal GPS antenna.". My answer although sarcastic is correct, it was obvious to me, so no discussion. However.... Obvious stuff gets missed sometimes, so there are no "basic" questions or comments, even if obvious. Apology if you are upset. I'll do better next time. 😊
 
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I love it. I don't have a 3D printer or access to one. Hate to ask but... I WILL. Can you print me one? PM me if you can, pay for materials and shipping. I see the link has suction cups. Did you use mechanical fasteners or are those super strength better suction cups? My base line plan was make it out of metal, or use the factory mount and attach brackets to that. Yours looks awesome. Do you have other colors?

However regardless thanks for picture. It helps me visualize.

Question what year is your RV=12iS do you have? That is a monster tank from what I recall? Is that a bigger one. Is your a RV-12 UL or iS? Just curious. I am helping a friend with his RV-12iS...
It was designed for suction cup mounting however they do not stay stuck very long. I changed to two strips of velcro and have not had any issues with it staying where I put it. Fuel tank is standard legacy RV-12 20-gallon unit with some SB mods added.
 
I mounted my Stratux on the right side of my -7A slider using 1" RAM ball mounts. It has the gps in it which has a clear view of the sky. It is powered using one of the power receptacles just below it with a usb plug.

FltPlan.go works better for me in displaying traffic on my iPad. I want to like and use Avarex, but the little v-shaped traffic target display just doesn't stand out enough from the map, especially when a sectional map is used.
 

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I mounted my Stratux on the right side of my -7A slider using 1" RAM ball mounts. It has the gps in it which has a clear view of the sky. It is powered using one of the power receptacles just below it with a usb plug.

FltPlan.go works better for me in displaying traffic on my iPad. I want to like and use Avarex, but the little v-shaped traffic target display just doesn't stand out enough from the map, especially when a sectional map is used.

Nice,
Whiat is cable coming out of the Stratux? Antenna or Power?
What are the other cables going up the roll bar?
 
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