Sunlight readable tablets

[6PK]

Recently I noticed several adds for 1000+ nit 7" or larger Android tablets available with high resolution screens on the internet.
It is my understanding (and I stand to be corrected) that this combination is what is required for good sunlight readability.
My question; is there anyone out there running any of these units with the available soaring software and acceptable results?

[waremark]

Not really an answer to your question, but have you seen Aquila, a 5 inch Android tablet developed as a glide computer solution? It claims 800 nit, and reviews say it is super bright. See the website: https://puregliding.fr/en/

[youngbl...@gmail.com]

The best available is Tripltek, I use them for daylight drone operations, they are expensive and android based. There are two different sizes that I am aware of. They have great battery life and extremely durable. Old Bob, The Purist

[Martin Gregorie]

On Wed, 22 Sep 2021 16:00:03 -0700, youngbl...@gmail.com wrote:

> The best available is Tripltek, I use them for daylight drone
> operations, they are expensive and android based. There are two
> different sizes that I am aware of. They have great battery life and
> extremely durable. Old Bob, The Purist
>

The best screens I've used have been trans-reflective ones: they're
readable with sunlight coming over your shoulder and falling directly on
the screen. I'm running LK8000 on a Medion S.3747 PNA, which uses this
screen type: it was designed for outdoor use, which probably explains the
screen type.

Only problem is that that its getting old (it runs WinCE!), so I'm
wondering if devices with this screen type are still being made.


--
--
Martin | martin at
Gregorie | gregorie dot org

[youngbl...@gmail.com]

The nit on the Tripltek is 1200

[Mark Mocho]

The best screens I've used have been trans-reflective ones: they're
readable with sunlight coming over your shoulder and falling directly on
the screen.

The original Flarm Portable and Flarm displays used transflective screens. Yes, they were very readable in direct sunlight, but were dim when shadowed, like when at cloudbase or flying into the sun and the screen was under the glareshield. I have a Butterfly 57 now, and it is essentially useless. Fortunately, targets appear quite nicely on the LX9000.

[Martin Gregorie]

On Wed, 22 Sep 2021 18:25:16 -0700, Mark Mocho wrote:

> The original Flarm Portable and Flarm displays used transflective
> screens. Yes, they were very readable in direct sunlight, but were dim
> when shadowed, like when at cloudbase or flying into the sun and the
> screen was under the glareshield. I have a Butterfly 57 now, and it is
> essentially useless. Fortunately, targets appear quite nicely on the
> LX9000.
>

Interesting: the Medion is equally readable whether the sun is ahead or
behind: it is on a fleximount in front of the lower right part of the
panel in my Libelle.

However, I'd agree that not all transreflectives are that good: back in
prehistoric times I bought a Compaq iPAQ, which ran XCSoar just fine, but
I never flew with it because I found its version of a transreflective
screen was low contrast enough to be hard to read no matter where the sun
was.

[Dan Marotta]

Martin,

You can still find a Dell Streak 5 (NOT a 7) for a reasonable price.  I
still have one mounted on the right side of the cockpit in my Stemme. 
It has a transflective display and is readable in direct sunlight.

Dan
5J

[Martin Gregorie]

On Thu, 23 Sep 2021 10:08:43 -0600, Dan Marotta wrote:

> Martin,
>
> You can still find a Dell Streak 5 (NOT a 7) for a reasonable price.  I
> still have one mounted on the right side of the cockpit in my Stemme. It
> has a transflective display and is readable in direct sunlight.
>

Thanks for the pointer, but the Medion isn't THAT ancient, I just
checked: I got it in 2014. Its working perfectly and has a few other good
design features such as the SD card being inside the back under a cover
plate, which is held on by a single screw. IOW, the SD card can't be lost
and taking the back cover off allows its battery to be popped out and
replaced if necessary. But its big benefit is that its relatively small,
a useful feature in a Libelle.

This shows it in situ at bottom right of my panel on a sunny day. As you
can see its no more washed out than the other instruments:

https://www.gregorie.org/gliding/libelle/panel_2017.jpg

[Dan Marotta]

Indeed.  That looks terrific!

Dan
5J

[6PK]

Thank you everyone for your response.
What I was hoping for is a magic device that may exists and as Bob suggested in the 7" Tripltek tablet may do the trick, although a little large but could work out , thanks to the growing drone population and hence an industry. (BTW they may have the perfect answer eventually for our needs, they too are seeking direct sunlight readability, and as they are a far larger group worldwide they getting catered to by the manufacturers ).
Over the years I went trough a number of Windows Ipaq, Verica 2 and Oudie devices These worked well but the smaller screen and outdated software made me want to trade up to the more up-to-date and supported Android program. I too did try the Dell Streak 5 which worked but the screen resolution IMO still left something to be desired compared to the old Windows PDAs.
Finally 6-7 years ago I started using the Kobo Glow and must say that nothing even comes close BUT it is grey scale and no sound. Some color and definitely sound is desirable when it comes to the airspace warnings especially, and it would be nice to be able to combine the Flarm into the moving map as well but than again it should have sound and color.
The new Android Oudie sounds promising but than one is stuck with their software which for all we know maybe completely different from the old one and which I for one was not overly impressed by, and at this point this new system is a great unknown.

[Christopher Gough]

I have used a Dell Streak and Note 4 in the past. I bought the Hisense A5 last year and it is by far the best cockpit display I have used so far. https://www.cect-shop.com/en/search?q=hisense

[Moshe Braner]

Yeah, it's hard to compete with the sun on brightness. If you can't
beat them join them. I.e., use reflective display tech (e-ink). Except
that in dark (or shaded) conditions it may need backlighting (or a
flashlight) - does the HiSense have that?

The HiSense A5 is black and white e-ink? I'm still using Nook and Kobo
e-readers because I like their e-ink display despite being only black
and white. The HiSense A7 CC has a color e-ink screen (close to 7
inches on the diagonal), alas it is expensive for now.

[Mike Carris]

Sony Xperia Z3 works great in the cockpit. It was the Sony flagship several generations ago, but you can still get new and refurbs at $150.00 or less . Not the compact version.

[6PK]

Christopher, this color E-Ink HiSense looks extremely promising to me and seems to fit what I am looking for.
I fly mainly in Southern California and the only issues I have encountered with the grey scale E-Ink (Kobo) is in hot conditions, when down low the screen tends to get washed out. It never crashed on me but it is a concern of mine. I don't know what region you are flying in so my question would be; how is the HiSense doing in the heat?

[krasw]

On Friday, 24 September 2021 at 02:03:10 UTC+3, 6PK wrote:
> On Thursday, September 23, 2021 at 11:19:21 AM UTC-7, Dan Marotta wrote:
> The new Android Oudie sounds promising but than one is stuck with their software which for all we know maybe completely different from the old one and which I for one was not overly impressed by, and at this point this new system is a great unknown.

Probably they will put all R&D efforts into SeeYou Navigator software. While the software is primitive right now, beta includes a lot more functions and I expect it to be pretty good already next season. AFAIK Oudie N includes lifetime updates as usual.

[Eric Greenwell]

Can you add a tiny 1.6" square 12 volt computer fan to blow on the back of your Kobo to
cool it? It works well on my iPhone 6 Plus in those conditions; higher, were it's cool, I
can turn off the fan.

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications/download-the-guide-1

[6PK]

Hmmm...interesting idea, thank you!

[Christopher Gough]

I fly in Canada but we did have some 90+ days during the summer. I haven't had any problem so far.

The Hisense A5 does have a backlight if it gets dark. I haven't needed it at cloudbase but it is there if you need it.

There is colour versions of the A5 and A7. I saw reviews saying the display is a bit more reflective and the colours are washed out. I am curious if it would be okay for XCSoar. But I didn't take the plunge. If I were going to buy again I would probably stick with the b&w. I would go for the A5 pro version with the usb-c connector as the micro-usb connector is kind of weak on the regular A5.

Chris

[Muttley]

If you are looking for an all in Solution you could consider
https://tinyurl.com/47kxjnff
Expensive, but probably worth it
I have no connection to this supplier!

Muttley

[Moshe Braner]

Without color, might as well use an old e-reader, they're cheap :-)

The micro-USB connector is terrible, they should have stuck with the mini-USB which is much more robust. I managed to break the micro-USB jack in an e-reader when trying to shove the cable into it in too much of a hurry before takeoff. Later I soldered cables with the big "USB type A" plug on the other end into the motherboards of two e-readers, just to avoid that micro-USB jack. The "type C" is nice since you can plug it in either way, no need to worry about which way is "up".

[6PK]

Since my last post I purchased a 7" 1000 nit tablet from Alibaba (first time ever).
https://www.alibaba.com/product-detail/T70L-2021-Drop-Resistance-PC-industrial_1600305804795.html?spm=a2700.themePage.5238101001221.72.7068233dPWLHTL
After much trials and tribulations with Bluetooth connections which non worked with my CNv XC flight computer using CAI302 protocol; I settled on a IOIO device from Soar Tronics which does seem to connect well. (Bluetooth devices are not always compatible, here the manufacturers do a poor job IMO not declaring what versions of Android works with what)
The tablet is "extremely" sunlight readable although somewhat large and heavy, it mounted to the panel using a RAM mount.
I was running TopHat prior but the IOIO did not want to connect to it however it does connect to the latest version of XCsoar just fine so that is what I will use.
It appears that there are many of these tablets coming on the market thanks to the drone people, that group being far larger and worthwhile I guess for the manufacturers to cater to.
The proof will be in the pudding, I will report later when I get to fly some with it in the upcoming season.

[cschra...@gmail.com]

> > It is my understanding (and I stand to be corrected) that this combination is what is required for good sunlight readability.
> > My question; is there anyone out there running any of these units with the available soaring software and acceptable results?
> Not really an answer to your question, but have you seen Aquila, a 5 inch Android tablet developed as a glide computer solution? It claims 800 nit, and reviews say it is super bright. See the website: https://puregliding.fr/en/

Damn, I wish I had seen this post. I just ordered a refurbished Samsung Note 4.

- Chris Schrader (CN)

[Moshe Braner]

Recently I got to see an Aquila in action. Works OK, but is not quite as bright as my old Samsung phone (J7) - neither is bright (contrasty) enough (for my eyes) in full sunshine. The recently-bought Aquila came with Android version 6, which is rather old, but works OK for the purpose (and my J7 phone has the same version). Personally I'll stick with a Nook (Android 2.x?) or Kobo (Linux?) e-reader, for the high contrast (but black-and-white) e-ink screen. The challenge is to arrange GPS data input for the e-readers. (All the devices I mentioned run Tophat or XCsoar.)

[6PK]

On Tuesday, August 2, 2022 at 12:52:12 PM UTC-7, Moshe Braner wrote:
> On Wednesday, December 29, 2021 at 4:02:55 PM UTC-5, cschra...@gmail.com wrote:
> > > > It is my understanding (and I stand to be corrected) that this combination is what is required for good sunlight readability.
> > > > My question; is there anyone out there running any of these units with the available soaring software and acceptable results?
> > > Not really an answer to your question, but have you seen Aquila, a 5 inch Android tablet developed as a glide computer solution? It claims 800 nit, and reviews say it is super bright. See the website: https://puregliding.fr/en/
> > Damn, I wish I had seen this post. I just ordered a refurbished Samsung Note 4.
> >
> > - Chris Schrader (CN)

> Recently I got to see an Aquila in action. Works OK, but is not quite as bright as my old Samsung phone (J7) - neither is bright (contrasty) enough (for my eyes) in full sunshine. The recently bought Aquila came with Android version 6, which is rather old, but works OK for the purpose (and my J7 phone has the same version). Personally, I'll stick with a Nook (Android 2.x?) or Kobo (Linux?) e-reader, for the high contrast (but black-and-white) e-ink screen. The challenge is to arrange GPS data input for the e-readers. (All the devices I mentioned run Tophat or XCsoar.)

It's been a while since I originally reported on my 7" Android tablet.
Since than I had the opportunity to fly with it (although not that much), compare it to some friend's the new Oudie "N" and the 8" Tripletek PRO.
The screen clarity, sunlight readability and resolution of the Alibaba 7" are just about identical to the Oudie "N", we could not tell the differentiate except for the size.
And to be honest we could not claim the Tripletek 8 clarity and sunlight readability any better that my Alibaba 7" tablet, the only difference noticed was more of a bluish background on the Tripletek 8.
My 7" tablet is kind of on the large size in the cockpit (the Tripletek 8 is even larger), I wish it would be about 1" smaller all around, and IMO the Oudie "N" could be a little larger.
Overall, the 7" Alibaba performs well in all aspects, however, not to be compared with the Kobo which I used the last few years as it beats everything in the sunlight readability front. Of course, the Kobo has a bunch of shortcomings too, but than that is another topic.

[Moshe Braner]

On 8/2/2022 8:27 PM, 6PK wrote:
>
> It's been a while since I originally reported on my 7" Android tablet.
> Since than I had the opportunity to fly with it (although not that much), compare it to some friend's the new Oudie "N" and the 8" Tripletek PRO.
> The screen clarity, sunlight readability and resolution of the Alibaba 7" are just about identical to the Oudie "N", we could not tell the differentiate except for the size.
> And to be honest we could not claim the Tripletek 8 clarity and sunlight readability any better that my Alibaba 7" tablet, the only difference noticed was more of a bluish background on the Tripletek 8.
> My 7" tablet is kind of on the large size in the cockpit (the Tripletek 8 is even larger), I wish it would be about 1" smaller all around, and IMO the Oudie "N" could be a little larger.
> Overall, the 7" Alibaba performs well in all aspects, however, not to be compared with the Kobo which I used the last few years as it beats everything in the sunlight readability front. Of course, the Kobo has a bunch of shortcomings too, but than that is another topic.
>

Yup. I've connected Nook & Kobo e-readers to external GPS (and FLARM)
data, both wired and wirelessly, if interested please ask.

[George Haeh]

I've run a few flights with a Sony Xperia Z3 tablet compact running SeeYou Navigator. It's quite bright enough on a NavPad strapped to my leg - far too big for a RAM mount higher up as it would block the view.

Navigator requires a current Android release, but installing that on the Z3TC is a miserable process, even if you are used to updating Nexus. Search LineageOS Z3TC.

[Dan Marotta]

Something like this should work just fine with an OTG connector.

https://smile.amazon.com/VK-162-G-Mouse-External-Navigation-Raspberry/dp/B01EROIUEW/ref=sr_1_4?crid=1QQII6RMRWUCM&keywords=gps+puck&qid=1659541755&sprefix=gps+puk%2Caps%2C239&sr=8-4

Dan
5J

[Thomas Van de Velde]

On Wednesday, September 22, 2021 at 7:00:05 PM UTC-4, youngbl...@gmail.com wrote:

> On Wednesday, September 22, 2021 at 10:42:13 AM UTC-4, 6PK wrote:
> > Recently I noticed several adds for 1000+ nit 7" or larger Android tablets available with high resolution screens on the internet.

> > It is my understanding (and I stand to be corrected) that this combination is what is required for good sunlight readability.
> > My question; is there anyone out there running any of these units with the available soaring software and acceptable results?

> The best available is Tripltek, I use them for daylight drone operations, they are expensive and android based. There are two different sizes that I am aware of. They have great battery life and extremely durable. Old Bob, The Purist

I recently purchased a Tripltek and have used it in flight. I've also used a variety of other Android devices over the years. Here are some pros and cons to consider for the Tripltek:
PROS:
* 1,200 nits brightness (similar to a built-in LXNAV screen)
* rugged
* built-in 4G LTE connectivity allows for real-time weather updates without the need for a separate hotspot. I use it with Naviter Navigator to get in-flight Skysight updates.
* wide operating temperature range from 0F to 120F (-18C to 49C). This is an important point as many other regular consumer devices tend to overheat and shut down during flight.
* battery life
CONS:
* Very heavy and bulky. This thing is a brick. You'll need a strong mount directly attached to your cockpit fuselage or strap it to your leg. I wouldn't use this with a suction cup.
* Expensive. At $800 you have to decide whether the pros listed above outweigh the lower cost of - let's say - a $140 Samsung Tab A tablet.
* No pressure sensor.

Here's a quick comparison between a Tripltek 8 and Samsung Tab A 8.0" with LTE:

Brightness: 1,200 vs 377 nits
Battery: 12,200 vs 5,100 mAh
Operating temp: -18 to 49C vs 0 to 35C
Resolution: 2560 x 1600 vs1280 x 800
Weight: 590g vs 345g
Price: $800 vs $144

[Thomas Orsini]

I recently purchased a Samsung S10+ from Back Market. I run XC Soar on it while flying and I'm completely satisfied with the screen brightness. I used to use a Dell Streak and the S10 is major upgrade to screen brightness, technology and a nice increase in size. It also quickly sinks with my LX Nav S10 vario via Bluetooth for data transmission. The S10+ internal GPS also works quite well with the program.

Tom

[John Foster]

On Wednesday, August 10, 2022 at 7:23:38 AM UTC-6, Thomas Orsini wrote:
> I recently purchased a Samsung S10+ from Back Market. I run XC Soar on it while flying and I'm completely satisfied with the screen brightness. I used to use a Dell Streak and the S10 is major upgrade to screen brightness, technology and a nice increase in size. It also quickly sinks with my LX Nav S10 vario via Bluetooth for data transmission. The S10+ internal GPS also works quite well with the program.
>
> Tom

I run XC Soar on my Samsung Galaxy Note S4. It is bright enough. But I have trouble with reflections on the screen, and am wondering if there is any coating or film I can apply to the screen to mitigate this problem.

[6PK]

Try something like this or similar;
https://www.boxwave.com/samsung-galaxy-note-4-screen-protectors/samsung-galaxy-note-4-cleartouch-anti-glare-2-pack-for-galaxy-note-4/bwpdd/cvg-pkpc/

[Tom Roth]

I've been very satisfied with my Nexus 7 (2013) running TopHat for many years and now XCSoar. The resolution (1920x1200) and nits (583) are still unmatched by any readily available Android device. Its only downside is that it's not had an official OS update since 2016 and there are now compatibility issues running the latest XCSoar. I solved this problem by installing Lineage (https://lineageos.org/). Lineage breaths new life into no longer supported Android devices. If you decide to follow up on my suggestion, please read over the Lineage install process thoroughly ... it really helps if you've done some Android development (or know someone who has). Since this update it's work flawlessly but ymmv.
- TomR

[Dan Marotta]

You should also take a look (if you haven't already) at the XDA
developers site. I found a slimmed down version of Kit Kat called
Slimcat that has none of the bloatware of an official release and boots
lightening fast. But first you need to root the device. I'll take at
Lineage just for giggles. BTW, I think my Nexus 7 is a 2011 version.

Dan
5J

[George Haeh]

After sideloading your chosen version of Android, you then need to sideload a Gapps (Google apps) package to get in the Google apps you want. The Play Store once installed allows you to install any app in the store.

Certain recoveries (installed in the recovery partition) run a dialog that allows you to pick and choose app by app.

For setting up a dedicated tablet or phone, the fewer apps, the better.

Right now my Sony flips on the camera app for no apparent reason and I haven't yet figured out how to stop it or get rid of the app. More challenge than I need in the cockpit.

[6PK]

On Thursday, August 11, 2022 at 11:03:42 PM UTC-7, Tom Roth wrote:
> I've been very satisfied with my Nexus 7 (2013) running TopHat for many years and now XCSoar. The resolution (1920x1200) and nits (583) are still unmatched by any readily available Android device. Its only downside is that it's not had an official OS update since 2016 and there are now compatibility issues running the latest XCSoar. I solved this problem by installing Lineage (https://lineageos.org/). Lineage breaths new life into no longer supported Android devices. If you decide to follow up on my suggestion, please read over the Lineage install process thoroughly ... it really helps if you've done some Android development (or know someone who has). Since this update it's work flawlessly but ymmv.
> - TomR

I experimented some with older and frankly some newer Android phones and tablets, and although some are more sunlight readable than others, one problem I find is heat. Some of them start ghosting or would outright black out permanently.
So, my question would be to Tom; did you have a chance to fly with the Nexus 7 in 100+F weather conditions and to what success?

[Tom Roth]

> I experimented some with older and frankly some newer Android phones and tablets, and although some are more sunlight readable than others, one problem I find is heat. Some of them start ghosting or would outright black out permanently.
> So, my question would be to Tom; did you have a chance to fly with the Nexus 7 in 100+F weather conditions and to what success?

I have heard this complaint before and experienced it first hand with the Nook as my flight computer but I've not with the Nexus. Or perhaps I should say, I cannot directly attribute Nexus failures to the temperature. However, I've also flown very few times when the temperature exceeded 100 degrees ... 110 degrees the last time I flew out of Siskiyou County, northern California. The Nexus did fine that day. I on the other hand, was dangerously close to heat exhaustion while disassembling the glider after a long afternoon flight! :-( In NW Oregon where I do most of my flying, mid-summer temperatures may get into the low 90's ... again no issues with the Nexus.

However, it's not a problem-free solution:
1) early on in my XCSoar/Android tablet/phone experience, even as a fledgling cross-country pilot I would frequently outlast my flight computer's battery. Turning off the wireless and closing all unnecessary applications/services helped but I soon learned to fly with a external battery pack in the glider's storage pocket and later installed a USB port on my panel. The (used) Nexus I purchased gave me better battery life but what really made the difference was installing a new, higher power replacement battery. I now get well over six hours of flight time on a charge.
2) the one time I used the external battery pack with the Nexus, other pilots informed me of garbled radio transmissions. I did not investigate the cause: battery pack, USB cable, Nexus? Also, it didn't seem to be a problem the few times I used the USB port on my panel.
3) maybe three or four times (in over 200 flights) the Nexus simply lost its mind and wouldn't respond to user input in a timely fashion. Perhaps this was heat related but I don't recall the temperature as being a factor any of those times and certainly not every time it's happened. At least once a reboot solved the problem and at least once just I turned it off, pulled out my phone, connected to the vario and continued my flight.

Of course, even with hardware/software specifically designed for aviation, you should always have a backup plan to get you home. XCSoar on the Nexus and an Android phone in the cockpit work for me. Both devices are capable of bluetoothing to my vario or utilize their internal sensors should the vario fail. Anyway, I hope this helps. :-)
- Tom

[Moshe Braner]

On 10/17/2022 4:06 AM, Tom Roth wrote:
> ...
> 1) early on in my XCSoar/Android tablet/phone experience, even as a fledgling cross-country pilot I would frequently outlast my flight computer's battery. Turning off the wireless and closing all unnecessary applications/services helped but I soon learned to fly with a external battery pack in the glider's storage pocket and later installed a USB port on my panel. ...

>2) the one time I used the external battery pack with the Nexus, other

pilots informed me of garbled radio transmissions...

I've installed USB power ports in several gliders. It usually worked
out OK, but is hit and miss regarding radio noise. The most recent one
I installed turned out to produce strong squelch-breaking noise on some
frequencies (123.3, alas) and not others (122.8).

Does anybody have recommendations for specific model voltage converters
that are radio-quiet?

Note that all the standard high-efficiency voltage converters use a
"switching" circuit that turns a current on and off at high frequency,
resulting in radio noise. Some have filters within to reduce the noise.
Or you can add external filters such as looping the cable a couple of
times through a ferrite ring.

Also note that an external USB power "bank", too, has a voltage
converter. It typically has a 3.7V lithium polymer cell inside, and
that is converted to 5V output. Same issues.

I have never heard of the radio noise being so bad that it affects
TRANSMISSION though. Try and add filters to the USB cable and/or the
glider's microphone cable?

[6PK]

Thanks Tom, very informative.

[Tom BravoMike]

On 2022-10-17 09:45, Moshe Braner wrote:
(...)

>
> Does anybody have recommendations for specific model voltage converters
> that are radio-quiet?
>

(...)

See this advice by Andreas Maurer from a few years ago:

Nov 16, 2019, 5:27:00 PM
Never use a 12V car charger, but use an RC UBEC instead that is
usually used to power RC components in model aircraft. These UBECs are
designed to create as little noise as possible in order not to disturb
the RC receiver.

An example:
https://www.banggood.com/External-BEC-UBEC-5A-5V-30V-Receiver-Power-Supply-p-1027700.html?rmmds=search&cur_warehouse=CN

Been using many of those for ages. Works like a charm.

-------------------------------
The link that Andreas gives doesn't work any more but I have found the
converter he mentions here:

https://alexnld.com/product/external-bec-ubec-5a-5v-30v-receiver-power-supply/

Tom BravoMike

[6PK]

Both Craggy and Cumulus sell power converters, I think other than the name it's six the one half a dozen the other. I had one and using it presently from I think Craggy for many years, never an issue.
I also believe in adding ferrites to both ends of any loose wire connector, maybe it works- maybe a myth, but it can't hurt, it's cheap insurance..

[Danny Brotto]

In a club glider, we had a USB Charger breaking radio squelch when the temperatures warmed up. (Replaced the radio and rewired things before realizing it was the USB supply.) I installed this one and it corrected the problem:

https://www.aircraftspruce.com/catalog/elpages/easmartdualusb.php

Based on my success some other club members also installed the same model in their aircraft with no problems.

Danny Brotto
LS-8/18 "P6"