PilotAware
British Forum => Technical Support => Topic started by: PaulSS on July 18, 2019, 12:57:16 pm
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Yes, another cable discussion ;D
I'm thinking of having my PAW (Classic with a Pi3B+) under my seat, where it will be close to the PAW external antenna. This will mean the power will have to run about 2m from the Charge4 USB supply I will have hidden behind the panel.
In the absence of 4AWG with a micro USB connector on the end, what is the opinion of the Power Gurus on this little number? Price is not really the snag, I just want it to do its job well ;)
https://www.juicebitz.co.uk/2m-20awg-premium-nylon-braided-strong-usb-2-0-type-a-to-micro-b-fast-data-charger-cable-black (https://www.juicebitz.co.uk/2m-20awg-premium-nylon-braided-strong-usb-2-0-type-a-to-micro-b-fast-data-charger-cable-black)
I like the red because it goes with the mist in my head and the braid reminds me of the snakes which come from the walls and tell me to do bad things ;D
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Depending on what you have in the Charge4, you can make one with very heavy wire if you want... these type A connectors are quite wide.
For some reason the links are very long, but the RS part numbers are 179-2871 and 179-2869
Basically these are connectors with screw terminals, you only need the power connectors. Should be able to get some really chunky stuff in there.
https://uk.rs-online.com/web/p/type-a-usb-connectors/1792869/
https://uk.rs-online.com/web/p/micro-usb-connectors/1792871/?relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D626572266C753D656E266D6D3D6D61746368616C6C26706D3D5E2828282872737C5253295B205D3F293F285C647B337D5B5C2D5C735D3F5C647B332C347D5B705061415D3F29297C283235285C647B387D7C5C647B317D5C2D5C647B377D2929292426706F3D3126736E3D592673723D2673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3137392D32383731267374613D3137393238373126&searchHistory=%7B%22enabled%22%3Atrue%7D
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Haha, I love the lateral thinking, Jeremy ;D
As you're a man wot knows about elektrizity, do you think 20 AWG is not 'man enough' for a 2m run? Would 18 be good, as I have quite a lot of that :)
Plugged into my Charge4 permanently will be my PAW with Pi3B+ and an iPad Mini 4. Occasionally will be an iPhone getting charged up etc but I expect normally there will be a maximum of 3 USB ports used at a time. I think the Pi3B+ will be using a good deal of its allowance of 2.4A per port and I expect the iPad Mini will be using a couple of amps if the screen is bright. That still gives me about 4-4.5A to use on phone charging etc, so I think my power plan should be okay for my PAW.
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Haha, I love the lateral thinking, Jeremy ;D
As you're a man wot knows about elektrizity, do you think 20 AWG is not 'man enough' for a 2m run? Would 18 be good, as I have quite a lot of that :)
Plugged into my Charge4 permanently will be my PAW with Pi3B+ and an iPad Mini 4. Occasionally will be an iPhone getting charged up etc but I expect normally there will be a maximum of 3 USB ports used at a time. I think the Pi3B+ will be using a good deal of its allowance of 2.4A per port and I expect the iPad Mini will be using a couple of amps if the screen is bright. That still gives me about 4-4.5A to use on phone charging etc, so I think my power plan should be okay for my PAW.
Depends if it will be 2m once it's been routed where you want it to be. Could be be less, but more than 1m? Are you going to excess with 2m when, say, 1.2m would be fine?
Probably be OK with 20AWG, if not then just get the wirable connectors and double up on the 18AWG (or 20AWG) as belt and braces. Always good to have a backup plan available...
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I am also interested in doing similar to what PaulSS is doing but in my case from a Charge2 which will also have an IpadMini2 in it. (Wish I had fitted a Charge4 when I built the aeroplane!)
What I am concerned about is the power drop to a Rosetta via say a 18AWG wire over 2m? Will this be a problem do you think?
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as far as AWG is concerned the smaller the number, the greater the diameter, so if you REALLY have 18AWG, thats really good, I would like to know where you got 18AWG with a MicroUSB connector
Thx
LEe
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re- 18AWG,. No sorry, my mistake, it is 20AWG but same question. Will it be ok over a 2metre run from the Charge2 behind the panel to the Rosetta mounted behind the seat do you think?
The alternative I suppose is to put the Rosetta behind the panel and then have 2metre Co-ax runs to the antennas?
Which is preferable, Power drop or Signal drop do you think?
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if you REALLY have 18AWG, thats really good, I would like to know where you got 18AWG with a MicroUSB connector
https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=18+awg+micro+usb&rt=nc&LH_PrefLoc=2 (https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=18+awg+micro+usb&rt=nc&LH_PrefLoc=2)
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Hi Lee,
I have some 18AWG wire (aircraft grade etc etc) and would just make up my own lead using the USB A and micro USB connectors that Jeremy provided links for. I would be very posh and have a customised lead ;D
Jeremy,
The lead may well come out a bit shorter than 2m but I know I wouldn't get away with 1m. I do like the idea of making my own as it looks very easy to do and gives me an excuse to play with shrink tube again 8)
Alan,
Which is preferable, Power drop or Signal drop do you think?
I think we're thinking along the same lines. I decided I would like to put my PAW under the seat (or in that general location) because it will mean a shorter coax run to my PAW antenna (underneath the aircraft) and to the ADSB antenna (which will be inside the fabric covering but behind the seats). It will also mean fewer boxes behind the panel, which will already be quite busy. With the Pi2 I don't think I would have been quite so fussy about power but the Pi3B (+) seems to be a bit more temperamental and I'd like to ensure I don't end up as another person who writes about throttling and the associated snags.
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as far as AWG is concerned the smaller the number, the greater the diameter, so if you REALLY have 18AWG, thats really good, I would like to know where you got 18AWG with a MicroUSB connector
Thx
LEe
There's a few over on Alibaba etc … charge only, but that's all that's needed
Unsure of the quality / longevity, but might be worth looking into
Cheers
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I bought one of these for charging phones and such, and have been fairly impressed even though it doesn't say what gauge the wire is. You can get 1.5m as well if it suits better than 2m. I thought I'd try it due to the flexibility of the cable. Seems to work quite well.
https://www.aliexpress.com/item/32889300505.html (https://www.aliexpress.com/item/32889300505.html)
Advertised as "2.4A" but not for the 2m cable!
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This is cheaper, isn't advertised as 2.4A, but has the same description below. Make of it what you will... :o
https://www.aliexpress.com/item/32671497421.html (https://www.aliexpress.com/item/32671497421.html)
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a while back I purchased various samples of cables advertised as 18AWG
..... and after a teardown, they most definitely were not !
Thx
Lee
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Which is preferable, Power drop or Signal drop do you think?
The short answer is ‘neither’.
At significant levels, Signal reduction will have a noticeable effect on range and traffic received - and at worst case, could have a serious effect on whether the received signal reaches the required trigger levels for Bearingless Mode-C and Mode-S alerts. Power drops on the other hand can cause the system to lose connectivity or at worst case, system shut down.
The answer is to balance power cable length against wire gauge, and where longer signal cables are required, use low loss (for the correct frequency) coax and high quality connectors.
Best Regards
Peter
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a while back I purchased various samples of cables advertised as 18AWG
..... and after a teardown, they most definitely were not !
Thx
Lee
Not really surprised there … some of the Chinese stuff is of dubious origin..
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a while back I purchased various samples of cables advertised as 18AWG
..... and after a teardown, they most definitely were not !
Thx
Lee
Not really surprised there … some of the Chinese stuff is of dubious origin..
Only some!
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Awg-Swg table attached.
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That table is AWG to external diameter, not necessarily the internal wire cross sectional area. It's best to go with the conductor cross section area for current calculations.
20 AWG is ~0.5mm2
18 AWG is ~0.8mm2
In terms of cables, defiantly don't judge them by their cover! I've seen supposedly beefy cables visually be tiny internally, the jacket is much cheaper than the metal inside!
Also, I'll also throw this in, don't use Copper Clad Aluminium (CCA) cable either. It's a horrible conductor at DC and is a pain when it ages.
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What a minefield! :(
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That table is AWG to external diameter.
I disagree. Converting the diameters to cross sectional areas more or less equals the examples you’ve given.
Why would a person making wire jewellery (which is the original target audience of the table) be interested in the diameter of any plastic sleeve?
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This should keep everyone happy :)
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This should keep everyone happy :)
Bit of a rash statement that Paul,
It certainly might keep the Donut Tramp happy. At least you didn’t Tweet it :-\
(only joking of course) 8)
Best Regards
Peter
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I'm going to have to resort to Google and decipher your code, Peter :)
Maybe because I've never tweeted (and don't have an account) I'm not 'down with the kids' and know what you're saying :-[
I just wanted to bring joy to those who were arguing about diameters versus cross sections ;D
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Sorry Paul,
I’m also a bit long in the tooth certainly for some of the more obscure social media apps. I was having a good natured and very mild dig at AWG pleasing our friends (and in my case relations) across the pond, though not necessarily some of our ‘British’ supporters (Hence my reference to the infamous ‘Let’s Make America Great Again’ ‘Tweeter’).
Sincere apologies to our more sensible American friends. No offence was intended. FWIW, I haven’t used ‘SWG’ in many years, but appreciate why Eric posted (with the most noble of intentions).
Best Regards
Peter
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Aahhh, now I understand :)
Don't worry about upsetting the Colonials. I am also afflicted with relatives from across The Pond and find most of the time they don't understand my sarcasm and insults, so I just banter away, free of concern for their sensibilities ;)
Even my youngest daughter has a touch of Yank about her, as she was born there and has a US passport to add to her UK and Australian ones. That can get expensive at renewal time :-\