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Balun questions
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| Lolo Wolf |
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Posts: 374
Joined: 18 Jan 2007
Location: Northwest Montana
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Posted: Sun Mar 02, 2008 11:00 pm
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Hello Cocacola, the box I see has no visible screw or threaded fit for cover...just curious is that cover snap fit? Does it have a gasket? Perhaps a channel or seal on the interior face plate? Any way if its rated outdoor as you say it should be OK. Using the side entry knockouts will keep water from collecting and pooling on top of your cable entry. (interesting.. on the rake of those joints tight to the brick) Regards
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| cocacola |
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Posts: 120
Joined: 12 Feb 2008
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Posted: Sun Mar 02, 2008 11:36 pm
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| Lolo Wolf wrote: |
| Hello Cocacola, the box I see has no visible screw or threaded fit for cover...just curious is that cover snap fit? Yes, (rubber gasket inside) Perhaps a channel or seal on the interior face plate? Any way if its rated outdoor as you say it should be OK. Using the side entry knockouts will keep water from collecting and pooling on top of your cable entry. (interesting.. on the rake of those joints tight to the brick) Regards |
The cable "knockouts" close them selfs whit a rubber ring wen i twisted it, so the cable knockouts seems to be air tight to.
I have also special gel in case of... i will see i a week or two if its 100% weather prove.
Can the baluns stand high or lower temperatures? like -8 or 50+ in the sun?
I can ad a "heating" in the housing...? got a car side mirror heater some were here..
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| Lolo Wolf |
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Posts: 374
Joined: 18 Jan 2007
Location: Northwest Montana
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Posted: Sun Mar 02, 2008 11:50 pm
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sounds like you are good to go......wouldnt worry bout a heater for that... get that conduit in there and call it a day....good luck
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| tommyt |
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Posts: 23
Joined: 25 Aug 2006
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Posted: Wed Apr 02, 2008 9:52 am
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| Quote: |
| also good idea to use your side entry knockouts to your cams than the top.... |
Can you enplane what you meen? I am not that good in Englishes, i just don't get it 
What he means is run the dome camera cables in from the sides rather than the top of the box, reduces risk of water penetration.
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| Daryl733 |
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Posts: 238
Joined: 09 Sep 2005
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Posted: Wed Apr 23, 2008 7:41 am
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The reason why the cable are twisted because it allows for cancellation of interference.
e.g. Blue, Blue/White are twisted. So if there's external EMF interfering with the signal, it'll induce a voltage on both the Blue and Blue/White to the same extend due to it being twisted.
e.g Blue = 1V, Blue White = 0V, so Voltage Difference, p.d. = 1V.
If there's external interference to the twisted pair, and thus Blue = 1.2V, BlueWhite = 0.2V, the Voltage Difference is still 1V. Thus the signal at the end will not be difference due to the induction of voltage due to any interference.
Therefore, when you use balun, use the TWISTED paid. Don't go thinking 2 is better than 1, so put Blue, Blue/White into 1 point, and Orange, Orange/White into the other. You'll basically eliminate the features of twisted pair cable. Stick to using 1 pair.
That's goes the same for Crimping a RJ45 network head. Follow the colours standard and not just crimp both end to the same color sequence.
The data send/receive will not be connected to the twisted pair then. For short distance, it'll work. But if you extend it longer, you'll find the data tranmission corrupted. I've seen too many contractors crimp the network cable the wrong way.
_________________
Prices Posted are MSRP in Singapore in accordance with guideline. Appearently some people are not that comfortable due to maybe lower taxes ? Or watever in Singapore. No more exact model prices posting. http://www.lakson.com.sg
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| Daryl733 |
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Posts: 238
Joined: 09 Sep 2005
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Posted: Wed Apr 23, 2008 7:43 am
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Last but not least... all baluns are not made equally. 
I've tried quite a number. Almost all work fine when use for short distance. But when you extend it to 3-400m, that's when you see the difference. Luckily, cabling is the same. Just swap out the balun.
_________________
Prices Posted are MSRP in Singapore in accordance with guideline. Appearently some people are not that comfortable due to maybe lower taxes ? Or watever in Singapore. No more exact model prices posting. http://www.lakson.com.sg
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| coolie11 |
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Posts: 89
Joined: 05 Oct 2007
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Posted: Mon Apr 28, 2008 4:46 pm
Post subject: Baluns
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| Daryl733 wrote: |
Last but not least... all baluns are not made equally.
I've tried quite a number. Almost all work fine when use for short distance. But when you extend it to 3-400m, that's when you see the difference. Luckily, cabling is the same. Just swap out the balun. |
I saw you mentioned you tested various baluns.
I was just wondering which one you though was the best?
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