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тАО11-06-2006 09:30 AM
тАО11-06-2006 09:30 AM
So is it just me, or does it seem odd for an indoor/outdoor directional antenna to only come with 2' of cable?
That would be great if I wanted to mount the 530 in a wiring closet or on my desk, but you'd think for the cost of the antenna a little more cable length would have been included.
Does anyone know what a max length is for this cable (whatever it is)when connecting to a 530?
Thanks.
That would be great if I wanted to mount the 530 in a wiring closet or on my desk, but you'd think for the cost of the antenna a little more cable length would have been included.
Does anyone know what a max length is for this cable (whatever it is)when connecting to a 530?
Thanks.
Solved! Go to Solution.
3 REPLIES 3
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тАО11-06-2006 04:37 PM
тАО11-06-2006 04:37 PM
Solution
There is some good information on cabling recommendations for these antennas here: http://www.hp.com/rnd/pdfs/antenna_tech_brief.pdf
If you need a long distance between the AP and the antenna, you should get LMR400 type cabling.
If you need a long distance between the AP and the antenna, you should get LMR400 type cabling.
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тАО11-07-2006 01:41 AM
тАО11-07-2006 01:41 AM
Re: J9000A antenna (with a 530na AP)
Because of the frequency there can be a lot of loss of signal in a long cable. You must use a heavier cable for longer runs.
http://www.radiolabs.com/products/cables/cable.php
http://www.shop.com/op/aprod-p49941882-k24-g1-~wifi+low+loss+cable-nover
http://search.ebay.com/wifi-extension-cable_W0QQfkrZ1QQfnuZ1
Rich
Say thanks with HP POINTS
http://www.radiolabs.com/products/cables/cable.php
http://www.shop.com/op/aprod-p49941882-k24-g1-~wifi+low+loss+cable-nover
http://search.ebay.com/wifi-extension-cable_W0QQfkrZ1QQfnuZ1
Rich
Say thanks with HP POINTS
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тАО11-07-2006 05:07 AM
тАО11-07-2006 05:07 AM
Re: J9000A antenna (with a 530na AP)
The operative word here is attenuation. This is loss over the length of the cable. The longer the cable, the poorer quality cable and the higher the frequency, the more attenuation you get. At 2.4 GHz frequency on which 802.11b/g operates on the attenuation in the cable will get very pronounced.
You can use a longer cable, just make sure you get the right cable. You want a 50 ohm cable of high quality. Get AIRCOM plus or AIRCELL 7 cable. These have loss of about 0.2-0.4 dB/m. Also, add about 1 dB loss (I think - comments, anyone...) for each connector. If you have an external directional antenna with a 6 dB gain the math for how long your cable should be will be pretty simple. Generally I guess I would be careful with cables much longer than a couple of meters.
Your local radio shop and actually some computer stores I have seen may try to sell you standard RG-58 50 ohm cable which is used for radio amateurs operating in the 27 MHz band or for old thinnet ethernet. If you use this, you might be cheaper and just as well off using shoelaces for cable.
See http://www.on1hh.be/ham/coax/ for a comparison of loss in cables.
You can use a longer cable, just make sure you get the right cable. You want a 50 ohm cable of high quality. Get AIRCOM plus or AIRCELL 7 cable. These have loss of about 0.2-0.4 dB/m. Also, add about 1 dB loss (I think - comments, anyone...) for each connector. If you have an external directional antenna with a 6 dB gain the math for how long your cable should be will be pretty simple. Generally I guess I would be careful with cables much longer than a couple of meters.
Your local radio shop and actually some computer stores I have seen may try to sell you standard RG-58 50 ohm cable which is used for radio amateurs operating in the 27 MHz band or for old thinnet ethernet. If you use this, you might be cheaper and just as well off using shoelaces for cable.
See http://www.on1hh.be/ham/coax/ for a comparison of loss in cables.
poi
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