Jeez Ralph - your post is misleading to EVERYONE that is reading this. Do you know what loss per 100ft is on 7/8inch heliax on 2.4ghz which can be had for $1.50/ft ???? What is your loss at 900mhz on 7/8thinch heliax ? How about lost per 100ft at 5.8ghz on 1 1/4inch heliax ?
Scott - here is the following specs for your loss you'll expect... By all means - if you can afford to leave your radios at the bottom of the tower - DO SO ! and ignore posts like Ralphs which are nothing but BS.... Loss on 7/8th Heliax per 100ft 2.4ghz = 2dB 900mhz = 1.1dB Loss on 1 1/4 Heliax per 100ft 5.8ghz = 2.2dB loss 2.4ghz = 1.5dB loss 900mhz = .8dB loss You'll need to add .5dB of loss per connector. Putting your radios at the bottom and using some 250mw Teletronics AMPS will give you a much better system then if you were to leave your radios at the top because your AP will also see a 17dB gain on the receive side. You will not be creating "noise, interference" if you use the proper AMP ! Scott - contact me offlist if you need some help deciding what cable / amp combos to go with..... The nice thing about running cable up your towers is - once you weatherproof your antenna and install the proper grounding straps along the run, you will more then likely never have to climb that tower again ! Ralph - please enlighten us with the reasons you've stated EVERYTHING you did.... Opinions are one thing, but false information is completely different and the only reason JohnnyO decided to take on this mule headed post :) JohnnyO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ralph Sent: Saturday, March 17, 2007 8:38 AM To: 'WISPA General List' Subject: RE: [WISPA] LMR600, LMR900, Heliax You can buy them at Tessco, I'm pretty sure. Stick with Heliax (r) type cables (hard line) for those distances, and use 1 5/8 minimum. The loss is amazing at anything above 450 MHz. Look at any cell tower and you will see what you need to use, then count on twice the loss if you use 2.4 or many more times that at 5.2 or 5.8 Look at a price range of tens of $ a foot, once installed properly. This brings you to the next obvious issue. Now for the lesson in RADIO. You have degraded your system so much by adding loss, you can figure that your antenna just magically became 0 dB gain instead of what it was. You may even totally offset the antenna gain and be upside down (as they say at the car dealer down the street). So go buy the best antenna you can, with the most gain possible. Of course now that moves us to the next step. Can't get a high gain antenna because now the tower company wants more rent, or the wind load is too high, or the pattern is too narrow. On to the next step- More APs so you can cover the areas that your new high-gain antennas leave out. Then, more hard line, then more $$$ etc. Or you can take the illegal, easy way out. Buy Amp. Create noise, Violate Part 15 and your radio's certification. Leave yourself open for a fine. Sounds to me that you are better off doing what most discovered the hard way: Leave the radios up top, do a great installation job, weatherproof, lightning protect, and enjoy the power you paid so dearly per milliwatt for in the first place! Ralph -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Reed Sent: Friday, March 16, 2007 6:05 PM To: WISPA General List Subject: [WISPA] LMR600, LMR900, Heliax Who supplies pre-terminated (N connectors) cables in the 70 to 150' range using LMR 600, LMR900 and/or Heliax? Looking to move radios to the bottom of towers. -- Scott Reed Owner NewWays Wireless Networking Network Design, Installation and Administration www.nwwnet.net -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.446 / Virus Database: 268.18.12/724 - Release Date: 3/16/2007 12:12 PM -- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
