{"id":187,"date":"2014-10-10T08:46:11","date_gmt":"2014-10-09T21:46:11","guid":{"rendered":"http:\/\/new.radio-active.net.au\/web3\/?page_id=187"},"modified":"2014-10-10T08:49:34","modified_gmt":"2014-10-09T21:49:34","slug":"cables-for-wifi","status":"publish","type":"page","link":"http:\/\/www.radio-active.net.au\/web3\/80211\/Hardware\/Cable","title":{"rendered":"Cables for WiFi"},"content":{"rendered":"

It takes about 6db to double your distance – since the power density at
\nthe receive site for double the distance is 1\/2 * 1\/2 = 1\/4 of the power
\nat the original distance. Thus you need 4 times the power if you double
\nyour distance, or 6 dB.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Cable<\/td>\nThickness (Inches)<\/td>\nLoss for 100′<\/td>\n<\/tr>\n
LMR-1200<\/td>\n<\/td>\n2.3 db\/100′<\/td>\n<\/tr>\n
LMR-900<\/td>\n0.870<\/td>\n2.9 db\/100′<\/td>\n<\/tr>\n
LMR-600<\/td>\n0.590<\/td>\n4.4 db\/100′<\/td>\n<\/tr>\n
LMR-400<\/td>\n0.405<\/td>\n6.7 db\/100′<\/td>\n<\/tr>\n
Belden 9913<\/td>\n0.405<\/td>\n7.5 db\/100′<\/td>\n<\/tr>\n
Belden 9914<\/td>\n0.405<\/td>\n8.7 db\/100′<\/td>\n<\/tr>\n
RG-213<\/td>\n0.405<\/td>\n13.7 db\/100′<\/td>\n<\/tr>\n
LMR-200<\/td>\n0.195<\/td>\n16.5 db\/100′<\/td>\n<\/tr>\n
RG-8<\/td>\n0.242<\/td>\n21.6 db\/100′<\/td>\n<\/tr>\n
RG-58<\/td>\n0.195<\/td>\n35 db\/100′<\/td>\n<\/tr>\n
LMR-100A<\/td>\n0.105<\/td>\n38.9 db\/100′<\/td>\n<\/tr>\n
RG-174<\/td>\n0.110<\/td>\n75 db\/100′<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Depending on what you are using for your 21m (70′) you may be able to gain
\na lot of range. The loss of cables at 70′ are<\/p>\n\n\n\n\n\n
RG-213<\/td>\n15.2 * 70\/100 = 10.64<\/td>\n<\/tr>\n
Belden 9913<\/td>\n8.15 * 70\/100 = 5.71<\/td>\n<\/tr>\n
LRM-400<\/td>\n6.76 * 70\/100 = 4.73<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

In order to double the range you need 6 dB. You could do this by going
\nfrom RG-213 to LMR-400. Or you could do it by using RG-213 and using 30′
\ninstead of 70′, giving a loss of about 5 dB.<\/p>\n

Access points such as the LinkSYS WAP-11 have about six inches of RG-174 from
\nthe radio to the antenna connector. This adds about 0.325 dB loss to the
\nunit.<\/p>\n

Connector Losses for 802.11<\/b><\/p>\n\n\n\n\n\n\n\n\n\n
Type<\/td>\nVSWR<\/td>\nFrequency<\/td>\nLoss (dB)<\/td>\nLoss at 2.4 GHz (dB)<\/td>\n<\/tr>\n
BNC<\/td>\n< 1.12 + 0.007F<\/td>\ndc to 2 GHz<\/td>\n<0.1F<\/td>\n<0.24<\/td>\n<\/tr>\n
N<\/td>\n< 1.06 + 0.007F<\/td>\ndc to 10 GHz<\/td>\n<0.05F<\/td>\n<0.12<\/td>\n<\/tr>\n
TNC<\/td>\n< 1.07 + 0.007F<\/td>\ndc to 15 GHz<\/td>\n<0.05F<\/td>\n<0.12<\/td>\n<\/tr>\n
SMA<\/td>\n< 1.02 + 0.005F<\/td>\ndc to 18 GHz<\/td>\n<0.03F<\/td>\n<0.07<\/td>\n<\/tr>\n
SMB<\/td>\n< 1.08 + 0.017F<\/td>\ndc to 4 GHz<\/td>\n<0.12F<\/td>\n<0.29<\/td>\n<\/tr>\n
SMC<\/td>\n< 1.08 + 0.017F<\/td>\ndc to 10 GHz<\/td>\n<0.06F<\/td>\n<0.14<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Personally I have a couple of interesting suggestions – D-LINK and others
\nhave a USB access point available – and there is an Open Source driver on
\nSourceForge. USB can be up to 25M from the computer with extension cables.
\nHave a USB access point at the antenna (NOTE: This is not good in if you g
\net lots of static buildup or thunder storms).<\/p>\n

Alternately the cost of an Etherenet Access Point might be cheaper (or
\neasier) than the cost of antenna cables. Also remember that coax does not
\nlive forevere. Here in OZ we have birds that eat coax, and also hot weather
\ndoes not help. CoAx outside might last 5 years before needing replacing
\non a rood in some areas. Once a coax is no longer waterproof, water gets
\nin and the loss goes really high.<\/p>\n

If anyone has any questions please ask…<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Channel<\/td>\nFrequency (GHz)<\/td>\n<\/tr>\n
1<\/td>\n2.412<\/td>\n<\/tr>\n
2<\/td>\n2.417<\/td>\n<\/tr>\n
3<\/td>\n2.422<\/td>\n<\/tr>\n
4<\/td>\n2.427<\/td>\n<\/tr>\n
5<\/td>\n2.432<\/td>\n<\/tr>\n
6<\/td>\n2.437<\/td>\n<\/tr>\n
7<\/td>\n2.442<\/td>\n<\/tr>\n
8<\/td>\n2.447<\/td>\n<\/tr>\n
9<\/td>\n2.452<\/td>\n<\/tr>\n
10<\/td>\n2.457<\/td>\n<\/tr>\n
11<\/td>\n2.462<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

from http:\/\/www.qsl.net\/kb9mwr\/projects\/wireless\/2400coax.txt(Dead Link)<p>
\nCOAXIAL CABLE CHARACTERISTICS
\n—————————–<\/p>\n

Attenuation @ 2.425 GHz
\nCable Length: 100 feet (30.48 meters)<\/p>\n

<B>The only problem is that the RG seems to be for 1 GHz. USE THIS LIST WITH CAUTION<\/b>
\n<p><\/p>\n

Cable Type Z dB Loss\r\n~~~~~~~~~~ ~~~~ ~~~~~~~\r\n\r\nRG-8....... 52.0 10.81\r\nRG-8 Foam.. 50.0 10.8\r\nRG-8A...... 52.0 10.81\r\nRG-9....... 51.0 10.83\r\nRG-9A...... 51.0 10.83\r\nRG-9B...... 50.0 10.77\r\nRG-11...... 75.0 10.78\r\nRG-11A..... 75.0 10.78\r\nRG-12...... 75.0 10.85\r\nRG-12A..... 75.0 10.85\r\nRG-17...... 52.0 3.76\r\nRG-17A..... 52.0 3.76\r\nRG-58...... 53.5 18.79\r\nRG-58 Foam. 53.5 18.66\r\nRG-58A..... 53.5 21.86\r\nRG-58B..... 53.5 18.78\r\nRG-58C..... 50.0 22.00\r\nRG-59...... 73.0 18.81\r\nRG-59 Foam. 75.0 13.94\r\nRG-59A..... 73.0 18.81\r\nRG-62...... 93.0 14.03\r\nRG-62A..... 93.0 14.03\r\nRG-62B..... 93.0 14.03\r\nRG-141..... 50.0 18.72\r\nRG-141A.... 50.0 18.72\r\nRG-142..... 50.0 18.69\r\nRG-142A.... 50.0 18.69\r\nRG-142B.... 50.0 18.61\r\nRG-174..... 50.0 61.22\r\nRG-213..... 50.0 10.78\r\nRG-214..... 50.0 10.73\r\nRG-215..... 50.0 10.84\r\nRG-216..... 75.0 10.85\r\n9913 Belden 50.0 7.7\r\nLMR-400.... 50.0 6.60\r\nLMR-500.... 50.0 5.40\r\nLMR-600.... 50.0 4.30\r\nLMR-900.... 50.0 2.90\r\nLMR-1700... 50.0 1.70\r\nAlum. 1\/2\". 50.0 3.40\r\nAlum. 3\/4\". 50.0 2.64\r\nAlum. 7\/8\". 50.0 2.01\r\nAlum. 1\/2\". 75.0 3.77\r\nAlum. 3\/4\". 75.0 2.79\r\nAlum. 7\/8\". 75.0 2.48\r\nHeliax 1\/2\" 50.0 3.9\r\nHeliax 7\/8\" 50.0 2.3\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
It takes about 6db to double your distance – since the power density at the receive site for double the distance is 1\/2 * 1\/2 = 1\/4 of the power at the original distance. Thus you need 4 times the …<\/p>\n
  Cables for WiFi<\/span> Read More »<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"parent":182,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P5cfmK-31","_links":{"self":[{"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/pages\/187"}],"collection":[{"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/comments?post=187"}],"version-history":[{"count":3,"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/pages\/187\/revisions"}],"predecessor-version":[{"id":190,"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/pages\/187\/revisions\/190"}],"up":[{"embeddable":true,"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/pages\/182"}],"wp:attachment":[{"href":"http:\/\/www.radio-active.net.au\/web3\/wp-json\/wp\/v2\/media?parent=187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}