The damn Yankee Bob M uses heliax and 5.8ghz all the time....... JohnnyO
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Rogato Sent: Saturday, March 17, 2007 10:56 AM To: WISPA General List Subject: Re: [WISPA] LMR600, LMR900, Heliax What about 5 gig Are you doing long runs and amps at 5gig? Blair Davis wrote: > We use both methods, depending on how hard the location is to climb.... > > For locations that are easy to climb, we put the radio at the top. > We've made our radios easy to feild swap on the tower. Four nuts, one > N-connector and an outdoor cat5. This swaps everything except the > antenna and coax. Static protection, grounding, electronics all swap > out as a unit. > > For locations that are hard to climb, I use radio at bottom, amp and > antenna at top. Started out using HyperLink amps, now use RF Linx. > Over 7 years, I've had 2 amps fail, and 1 antenna and amp destroyed by a > direct strike. In the direct strike, the amp saved the coax down the > tower and all the radio gear below... > > And RF Linx replaced the amp under warranty..... > > There is room for both methods and a wise engineer picks the appropriate > one for the location. > > JohnnyO wrote: >> 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. >> >> > -- George Rogato Welcome to WISPA www.wispa.org http://signup.wispa.org/ -- WISPA Wireless List: wireless@wispa.org 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: 268.18.13/725 - Release Date: 3/17/2007 12:33 PM -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
