Date   

Re: Power cable conductor gage (AWG) of

Christopher Erickson
 

At least nobody started talking about skin effect, nominal velocity of propagation, current NEC electrical code requirements, insulation dielectric characteristics, breakdown voltages, mutual inductance, impedance, hysteresis, magnetic fields, reluctance, EMI shielding, plating techniques, ductility, annealing, connector MTBF, connector insertion lifetimes, NEMA ratings, EMP, lightning protection, R-56 compliance, insulation color coding, insulation UV ratings, US vs. ISO specifications, suppleness.......


-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Fri, Apr 9, 2021, 9:36 AM Seb@stro <sebastiendore1@...> wrote:
Kenneth,

Yeah, tought of that but I found them a bit expensive to ship to my location (Canada) so I got them from a local dealer instead. Thanks anyway.

CS!
Sébastien


De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Kenneth Tan <ktanhs@...>
Envoyé : 9 avril 2021 13:47
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Power cable conductor gage (AWG) of
 
Try getting the cables from Powerwerx. They also supply the Anderson powerpole connectors. 

On Sat, 10 Apr 2021 at 01:05, Seb@stro <sebastiendore1@...> wrote:
I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

Seb@stro
 

Kenneth,

Yeah, tought of that but I found them a bit expensive to ship to my location (Canada) so I got them from a local dealer instead. Thanks anyway.

CS!
Sébastien


De : main@ap-gto.groups.io <main@ap-gto.groups.io> de la part de Kenneth Tan <ktanhs@...>
Envoyé : 9 avril 2021 13:47
À : main@ap-gto.groups.io <main@ap-gto.groups.io>
Objet : Re: [ap-gto] Power cable conductor gage (AWG) of
 
Try getting the cables from Powerwerx. They also supply the Anderson powerpole connectors. 

On Sat, 10 Apr 2021 at 01:05, Seb@stro <sebastiendore1@...> wrote:
I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

Seb@stro
 

Some of you people are REALLY over-thinking this...

Christopher, I plead guilty. 😬

But as you'll certainly agree, better do it right once and for all. I personnaly don't like oversizing everything just to be on the safe side when I know I can optimize something. But that's just me, trying to pull every tenth of an ounce of performance out of my equipment... 

And hey, system integration is half the fun of this hobby. Using AP equipement doesn't leave many things to fuss with so I thought why not try to bring the rest to the same standard.

CS!
Sébastien


Re: Mac Desktop version of SkySafari Updated today to 6.8.X

Allen Ruckle
 

Mac OS ap SkySafai 6 plus was updated to version 6.8.1 this week but they do not appear to know about the Park positions and Home location for the Astro-Physics GTO mounts.  I know this because after installing the latest SkySafari update and tested the new update 6.9.1 which has not been corrected.

The Simulated Curriculum product forum as configured will not allow my attempts to register a new account.  This prevents me from posting my findings on the forum to notify them of the problem directly.

aruckle


Re: Power cable conductor gage (AWG) of

Mike Dodd
 

On 4/9/2021 1:52 PM, Christopher Erickson wrote:
Some of you people are REALLY over-thinking this...
That's what I was going to say.

Technically, all the points made were valid, but practically, to power an AP mount, don't over-think it! Get some 16AWG insulated stranded copper wire (14AWG for REALLY long runs), and be done with it.

--- Mike
http://astronomy.mdodd.com


Re: Power cable conductor gage (AWG) of

Kenneth Tan
 

🤣🤣🤣

On Sat, 10 Apr 2021 at 01:53, Christopher Erickson <christopher.k.erickson@...> wrote:
Some of you people are REALLY over-thinking this...

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Fri, Apr 9, 2021 at 7:48 AM Kenneth Tan <ktanhs@...> wrote:
Try getting the cables from Powerwerx. They also supply the Anderson powerpole connectors. 

On Sat, 10 Apr 2021 at 01:05, Seb@stro <sebastiendore1@...> wrote:
I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

Christopher Erickson
 

Some of you people are REALLY over-thinking this...

"My advice is always free and worth every penny!"

-Christopher Erickson
Observatory Engineer
Summit Kinetics
Waikoloa, Hawaii


On Fri, Apr 9, 2021 at 7:48 AM Kenneth Tan <ktanhs@...> wrote:
Try getting the cables from Powerwerx. They also supply the Anderson powerpole connectors. 

On Sat, 10 Apr 2021 at 01:05, Seb@stro <sebastiendore1@...> wrote:
I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

Kenneth Tan
 

Try getting the cables from Powerwerx. They also supply the Anderson powerpole connectors. 

On Sat, 10 Apr 2021 at 01:05, Seb@stro <sebastiendore1@...> wrote:
I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

Seb@stro
 

I was looking at SJEOOW Seoprene Cu cable from Southwire (similar to the power cable that goes from the power source to 12-24V input on the CP5). Those are rated at 300V and stay quite flexible even at very low temperature (rated from -50 to 105 Celsius). The 16/2 nominal DCR is 4.05 Ohms/1000ft and composed of 26 strands of 30 AWG conductors. 

If I can find it somewhere in bulk quanity, I should be good to go.

CS!
Sébastien


Re: Power cable conductor gage (AWG) of

ap@CaptivePhotons.com
 

And some wire on Amazon and similar places is aluminum and as a rough estimate assume you need a full size increase (for AWG 18 copper use AWG 16 Aluminum, where “size” is 2 numbers, for reasons lost in NEC past).

 

Copper Clad aluminum (CCA) is even more widely sold, it looks like copper, it is very slightly better than pure aluminum, but is still aluminum.  It’s often really hard on Amazon to tell if something is CCA or copper (on purpose as CCA is much cheaper).

 

Copper is still the gold standard.   CCA and Aluminum exist to be cheap, really.

 

 

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Stone, Jack G via groups.io
Sent: Friday, April 9, 2021 12:13 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Power cable conductor gage (AWG) of

 

Remember current flows through the wire – so wire that has a lot of small strands will have a lower IR drop.

So not all 14AWG has the same current handling capability – they can differ by quite a bit.

Vendors usually have online calculators for their products.

Also important is the insulation rating

 

Regards,

 

Jack ~

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of vk3cjk
Sent: Friday, April 09, 2021 6:34 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Power cable conductor gage (AWG) of

 

Knowing the wire gauge will enable the minimum voltage drop at a certain current to be calculated but it will not take the extra resistance of any poor connections into account.  It's always best to do an end to end test under load. 

Cheers, Chris

 

On Fri, 9 Apr. 2021, 22:59 Seb@stro, <sebastiendore1@...> wrote:

Hello Dale,

Not exactly. Voltage drop is also function of current flowing through the conductor (which I can get from the PPBA) and wire characteristics (mainly gauge ie. cross-section area and length at DC).

To be valid, the experimental method you describe would require to be done under load and would require me to make some kind of adapters to hookup the Multimeter at both ends while every component is consuming its average current.

I could do that but I’m lazy and I figured it was quicker to ask for the wire gauge and do the Math to calculate theoretical voltage drop.

CS!



Re: Power cable conductor gage (AWG) of

Stone, Jack G
 

Remember current flows through the wire – so wire that has a lot of small strands will have a lower IR drop.

So not all 14AWG has the same current handling capability – they can differ by quite a bit.

Vendors usually have online calculators for their products.

Also important is the insulation rating

 

Regards,

 

Jack ~

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of vk3cjk
Sent: Friday, April 09, 2021 6:34 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Power cable conductor gage (AWG) of

 

Knowing the wire gauge will enable the minimum voltage drop at a certain current to be calculated but it will not take the extra resistance of any poor connections into account.  It's always best to do an end to end test under load. 

Cheers, Chris

 

On Fri, 9 Apr. 2021, 22:59 Seb@stro, <sebastiendore1@...> wrote:

Hello Dale,

Not exactly. Voltage drop is also function of current flowing through the conductor (which I can get from the PPBA) and wire characteristics (mainly gauge ie. cross-section area and length at DC).

To be valid, the experimental method you describe would require to be done under load and would require me to make some kind of adapters to hookup the Multimeter at both ends while every component is consuming its average current.

I could do that but I’m lazy and I figured it was quicker to ask for the wire gauge and do the Math to calculate theoretical voltage drop.

CS!




Re: A Question Regarding an AP900 Mount

 

I just realized I never fully addressed your problem! Sorry Chris!

You can swap the RA and Dec cables on the 900 mount. Depending on your cable harness setup, this might require some contortion on your behalf. If you switch the cables and the problem follows the Dec cable, it is either the cable or the CP2. If the problem stays on the Dec axis, the problem is mechanical in nature. 

Email me directly when you have tried this, so we can work on it together. 

--
Liam Plybon
Astro-Physics


Re: Power cable conductor gage (AWG) of

Seb@stro
 

Thanks again Liam, much appreciated!

Clear skies!
Sébastien


Re: Power cable conductor gage (AWG) of

 

Howdy,

 

The through mount power cable inside the Mach 2 is a 24” 16 AWG cable.

 

Liam

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Seb@stro
Sent: Friday, April 9, 2021 8:49 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Power cable conductor gage (AWG) of

 

Knowing the wire gauge will enable the minimum voltage drop at a certain current to be calculated but it will not take the extra resistance of any poor connections into account.  It's always best to do an end to end test under load. 

Cheers, Chris

 

Chris,

 

Agree on that. But for sizing my own cable purpose, it's just not worth going the extra effort now.


I'm not looking to resolve a current issue, rather to prevent creating one by undersizing my own cable... If I ran into any problem with poor connectors, thermals will tell soon enough.

 

CS!

 

 


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Re: APCC / APPM Frustration

Howard Hedlund
 

Ray and Marty,
Please Cc me on your further conversations.  I want to stay in the loop!

To all who have contributed to this thread, thank you!  When we solve this issue, I will try to post a summary of the solution for everyone's benefit.

Howard


Re: Power cable conductor gage (AWG) of

Seb@stro
 

Knowing the wire gauge will enable the minimum voltage drop at a certain current to be calculated but it will not take the extra resistance of any poor connections into account.  It's always best to do an end to end test under load. 
Cheers, Chris

Chris,

Agree on that. But for sizing my own cable purpose, it's just not worth going the extra effort now.

I'm not looking to resolve a current issue, rather to prevent creating one by undersizing my own cable... If I ran into any problem with poor connectors, thermals will tell soon enough.

CS!



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_._,_._,_


Re: Power cable conductor gage (AWG) of

vk3cjk
 

Knowing the wire gauge will enable the minimum voltage drop at a certain current to be calculated but it will not take the extra resistance of any poor connections into account.  It's always best to do an end to end test under load. 
Cheers, Chris

On Fri, 9 Apr. 2021, 22:59 Seb@stro, <sebastiendore1@...> wrote:
Hello Dale,

Not exactly. Voltage drop is also function of current flowing through the conductor (which I can get from the PPBA) and wire characteristics (mainly gauge ie. cross-section area and length at DC).

To be valid, the experimental method you describe would require to be done under load and would require me to make some kind of adapters to hookup the Multimeter at both ends while every component is consuming its average current.

I could do that but I’m lazy and I figured it was quicker to ask for the wire gauge and do the Math to calculate theoretical voltage drop.

CS!





Re: Power cable conductor gage (AWG) of

Seb@stro
 

Hello Dale,

Not exactly. Voltage drop is also function of current flowing through the conductor (which I can get from the PPBA) and wire characteristics (mainly gauge ie. cross-section area and length at DC).

To be valid, the experimental method you describe would require to be done under load and would require me to make some kind of adapters to hookup the Multimeter at both ends while every component is consuming its average current.

I could do that but I’m lazy and I figured it was quicker to ask for the wire gauge and do the Math to calculate theoretical voltage drop.

CS!


Re: About APCC and ISS tracking and PC Time

Dale Ghent
 

I'm not sure which app it is that you're using, but it's probably not adjusting its display of time for DST given that it's 1 hour behind your clock display and your location is observing DST. Seems odd to me that it wouldn't do this, but perhaps it uses its own timezone conversion based on the coordinates and this tz data might not have any notion of DST or purposefully avoids adjusting for it.

If you want your computer clock to be tied to the GPS-derived time, you should use an app like the aforementioned NMEATime2 instead of eyeballing it. Give sufficient time for the GPS lock to happen and the computer clock to the slewed to the GPS time before connecting to the mount with the A-P driver, which should have the "Sync PC time to mount" option set. I believe this is done only on initial connection to the mount when location and time are initialized.

Actually, this is a good question for Ray: Is the clock sync done only on initialization or is it also done periodically for the duration of the connection? I've never been clear on this and have always assumed it was a one-time deal when the driver first initializes the mount.

/dale

On Apr 9, 2021, at 01:30, drgert1 via groups.io <drgert1=yahoo.com@groups.io> wrote:

Hello All,

Thanks for the great discussion. I just tested a GPS dongle vs the Windows 10 time (just after having told Windows to sync with the network time reference). The time is off by 1hr and 2sec. Now, which one is right for ISS tracking? Very interesting!

<GPS_vs_Win10.jpg>

Cheers,
Gert


Re: Power cable conductor gage (AWG) of

Dale Ghent
 

You can just measure the output of the psu with a multimeter, then hook the psu up to the mount and measure the voltage again at the output on the dec axis. The difference is your voltage drop.

On Apr 8, 2021, at 22:26, Seb@stro <sebastiendore1@hotmail.com> wrote:

Thanks for the confirmation, Liam! Right, these Powerpoles are very versatile indeed.

While I’m at it, I’m also going to make another cable extension to power the Pegasus PB Advance (which in turn powers everything else) piggybacked on the OTA using through-the-mount cabling.

I read in the manual a recommendation to use 14 or 16 gauge wires for that purpose so should I assume the internal cable is 14 AWG ? That would help calculate the voltage drop along the whole cable from battery to PPBA and size the extension accordingly...

Sébastien



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