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8 core coily cable


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#1 Iain Baird

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Posted 19 November 2007 - 07:47 PM

Howdy Folks,

I'm looking to make a backup cable for my post and would like to use the same coily cable that's in it now. I have the MK-V four stage extendable post and the cable is actually 7 core (5 single, 1 coax) but would like to make an 8 core (6 single 1 coax) I tried e-mailing Howard but he has not returned back to me.
Does anyone know of a supplier, for either version?

cheers,
Iain Baird
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#2 Iain Baird

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Posted 19 November 2007 - 08:17 PM

A little bit of internet savy and I've found a source,

http://www.cablescience.com

thanks,

IAIN
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#3 David Hughes

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Posted 20 November 2007 - 07:14 AM

A little bit of internet savy and I've found a source,

http://www.cablescience.com

thanks,

IAIN

I am looking for a new post cable as well, I was told that a PRO post cable should do the job, same lemo's but one of the pins is apparently diferent. Does anyone know if is this true?
Dave.
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#4 JobScholtze

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Posted 20 November 2007 - 02:10 PM

Before this starts to something ......... ;)
Howard is doing a movie for a few weeks, so you should talk to Mia. I just ordered the new V2 Dbox to work with my new AR and she emailed me right back. After mails back and forth she also called me to make things sure. Also the new box was send out the next day. No lack of communication so far.

Job
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#5 Mia Quayle

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Posted 20 November 2007 - 05:31 PM

Howdy Folks,

I'm looking to make a backup cable for my post and would like to use the same coily cable that's in it now. I have the MK-V four stage extendable post and the cable is actually 7 core (5 single, 1 coax) but would like to make an 8 core (6 single 1 coax) I tried e-mailing Howard but he has not returned back to me.
Does anyone know of a supplier, for either version?

cheers,
Iain Baird



Hi, Iain

So sorry you didn't get a response to your request - I'm afraid I couldn't find any emails from you in our back-system, so I can only assume your message never reached us, server problems perhaps? We did have a few of those a little while back. So apologies..

I'd be more than happy to help you out, though - drop me a line with your details and I'll get straight onto it for you.

Best Wishes,

mia@mk-v.com
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#6 Nikolay Kerezov

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Posted 24 November 2007 - 04:45 AM

Please if you find good solution (6 or 7 core + coaxial) let us know!
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#7 Howard J Smith

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Posted 24 November 2007 - 01:30 PM

Hi Nikolay

We have these in stock - if you need anything like this please email us - info@mk-v.com

All the best
Howard
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#8 Iain Baird

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Posted 30 November 2007 - 01:24 PM

A few notes,

When Howard sorted out his spam settings on his e-mail account he was very helpful and has all the post cables in stock at reasonable prices.

The People at CableScience were however not very helpful at all. They answered my inquiry very quickly and even called me the next day. But as soon as I explained that I would only be ordering one unit they've ignored my e-mails ever since.

IAIN BAIRD
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#9 Iain Baird

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Posted 10 December 2007 - 06:03 PM

Another Update,

CABLESCIENCE has since been in touch with me and they in fact do offer a few different coiled cables.


Part Number: EC206RG179-CL
6 cond #20 AWG. plus one miniature coax 75 ohm (RG179)
Jacket: Shiny PU
Cable OD: .370" nom.
Coil OD: 1.25"
Retracted length of coiled portion: 13" (5-6 ft extended)
Straight leads: 6" and 6"

Qty: 1-4 $ 45.00 Each



Option 2:
Part Number: ECS226-CL
6 Insulated conductors, #22 AWG. (plus one bare wire touching Aluminum Mylar shield)
Jacket: Shiny PU
Cable OD: .250" nom.
Same coil dimensions as above

Qty 1-4 $ 27.00 Each
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#10 Jerry Holway

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Posted 10 December 2007 - 06:40 PM

Iain-

I hope you are aware that both the options you noted have very small wire sizes.

Even if you are wiring three in parallel for only 14 volts and ground, the effective size is still very small for any high amp loads.

If you are wiring for 14 volts, 28 volts, and ground, the effective wire size is even smaller.

Not sure what your requirements are, but get some more advice before you modify...

Jerry
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#11 Iain Baird

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Posted 10 December 2007 - 10:49 PM

Now I am a bit confused. The cables I use to power a 24v camera (made by PRO) are Mogami 2549. They use a #22 AWG for the current. The #20 AWG is a bit bigger and rated even higher. The wires inside my Sled are either #22 or #20 AWG and they have a 24v current running through them. I ask this out of ignorance but how can the same AWG #20 not be good enough to run 24v up the post?
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#12 Eric Fletcher S.O.C.

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Posted 11 December 2007 - 01:25 AM

Now I am a bit confused. The cables I use to power a 24v camera (made by PRO) are Mogami 2549. They use a #22 AWG for the current. The #20 AWG is a bit bigger and rated even higher. The wires inside my Sled are either #22 or #20 AWG and they have a 24v current running through them. I ask this out of ignorance but how can the same AWG #20 not be good enough to run 24v up the post?


A few things.

22 AWG wire is rated at 7 amps in clear air. That means NOT next to another wire, which is something that we all ignore. if we actually paid attention to that it would mean a current capacity of only 4.6 amps and that will power a film camera, well not a 435 but the rest of them. It will NOT safely power a F900, Viper, Genesis or F23 since they are all 9+ amp cameras.

20 AWG is rated at 11 amps in clear air or 6.6 amps in a cable pair/bundle. Still Not enough to power a HD camera.

XCS uses 14AWG Wire in their post which will carry 32 amps free air or 19.2 amps in a cable pair/bundle. Tiffen is also using 14awg in the U2. MK-V uses 22awg by the way and they have some other serious power issues due to voltage drop.

Voltage drop goes up with length of the cable run. That cable run is the length of the post cable plus the camera power cable. in a Pro with the standard post that's around 65" but voltage drop is round trip so it's a ~11ft run. For the sake of argument let's use the maximum current capacity of each wire size to figure out voltage drop. For the 22awg wire you are looking at a 4% or 1 Volt Drop. the 20awg wire will see a 3.5% or .8volt drop.

Lets look at 2 XCS center post's the Fixed and the expandable. The fixed post has a 6' round trip and the expandable has a 12' round trip. the Fixed Voltage drop is 2.75% or .3 volts. the expandable has a 5.5% or .6 volt drop

The U2 is going to have a 6.64% or .797 volts.

MK-V has an internal cable run of 9 feet on the four section post with it's 22awg wiring suffers a whopping 11.5% or 1.4 volt drop.

What does this mean? Since HD cameras are the the worst case scenario for voltage with their 11 volt shutdown, it means MK-V will shut down first even though the battery is showing 12.4 volts, Followed by the Pro at 12 volts the U2 at 11.8 and the XCS at 11.3

Kinda explains why I switched to an XCS Ultimate earlier this year.
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#13 Iain Baird

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Posted 11 December 2007 - 07:56 AM

Thank you Eric for your very consise answer. I have used the F900 extensively with my MK-V post and have never had critical issues but notice that the camera will shut down if I don't stay one step ahead of the battery meter on the camera display. Once it's at three bars, I change batts. I also use 1 hytron 150 instead of the Hytron 50's. This being said what are the dangers with the MK-V post as I power the F900. I would also assume that if I presently have 22 AWG in my post, an upgrade to 20 AWG is at least a good start.

Edited by Iain Baird, 11 December 2007 - 07:56 AM.

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#14 Jerry Holway

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Posted 11 December 2007 - 11:14 AM

Eric-

Again, excellent analysis/explanation.

FYI, to be accurate, all the Ultras use 14 gauge wires for power, always have.

Also 5 separate coax's for regular video and HD component (4 down, one return).

One of the five in the Ultra 2 is a special coax (larger, special connectors/no breaks) for HDSDI, and a data communications line!

Jerry
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#15 KellyHernsdorf

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Posted 11 December 2007 - 02:26 PM

Hi there-

I'm just posting on this topic to say that Howard has been TYRING to reply to the incorrect technical information on his cables, but his posts have been continually deleted. Very frustrating to not be allowed to post the CORRECT information about your own product!!

Take care all,
Kelly
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