Thanks for the reminder. As with most of life, there is no one right
answer.
On towers over 100' or so, radios at the top and pay the climbers as needed.
For shorter towers, which server smaller area anyway, I am looking at
higher power, more sensitive radios at the bottom to offset the cable
loss and reduce the need for climbers for repairs. Also, less climber
time to install and when the time comes to add antennas.
Yes, obviously not every site gets the same treatment. I do have one
100' tower with a SmartBridges Pro Outdoor at the bottom and 120' of
LMR400 going to an omni that is getting exactly the coverage area I need
and expected it to deliver. I have other locations that I can not
afford to lose one bit of gain from what I have. I have new locations
that, if I decide to put radios at the ground, will have coverage areas
based on what is available from the radio/cable/antenna.
Ralph wrote:
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
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