What does Polarisation: Linear, Beamwidth: (Azimuth / Elevation) 5° / 6° mean

[portcullis]

Up goes the pole or the tower...

 

[Kameelperdza]

i can always get 6meter aliminium pole but i dnt have support cables

 

[kilos]

Yes 6m pole is your only way to get a better signal hence the fluctuations in signal (tree might shed leaves too & effect the signal) That will make a big difference and I prefer galvanised steel pole to aluminum poles.

Do you have a high site in Oudtshoorn for the WUG or using the Wispernet high site on the East & West Reservoirs ?

Can you see the Outeniqua Mtns above George where you are ?

I connect 10km Clear Line of sight from the Owlcam pine tree to a WisP high site on the Outenqua Mtns -
Signal level -62 dBm using a Ubiquiti Nanostation 2

George is pretty congested in the 2.4 Ghz freq range with over 600 home Wifi,Hotspot and WiSP.

iwconfig
ath0 IEEE 802.11b ESSID:"xxxxx"
Mode:Managed Frequency:2.432 GHz Access Point: 00:xx:xx:xx:xx:xx
Bit Rate:11 Mb/s Tx-Power=13 dBm Sensitivity=0/1 (TX Power = 19mW)
Retry: off RTS thr : off Fragment thr : off
Encryption key: off
Power Management: off
Link Quality=35/94 Signal level=-62 dBm Noise level=-97 dBm
Rx invalid nwid: 0 Rx invalid crypt: 0 Rx invalid frag: 0
Tx excessive retries: 0 Invalid misc: 0 Missed beacon: 0

 

[Kameelperdza]

where can i get the calvanised 6m steel poles? scoop only sells aliminium. i can see mtn and sentec tower where i am. i dont think wispernet wil let me use some of their heighsite space. i have one heighsite at klein karoo toyota and at my house.

 

[portcullis]

... I prefer galvanised steel pole to aluminum poles.

+1.

We recently used two NS2's in Mazabuko, Zambia to get telemetry data from a farmer's pumphouse back to his office. There's a 27m VHF tower at the office. We popped the NS2 up there and pointed it to the other NS2 16km away as the crow flies.

Perfect connection.

Kilos, right now I'm playing with one of these. It's a lot of camera for under R800, but I'm having no end of drama getting the triggers to not give false alarms.

 

[portcullis]

where can i get the calvanised 6m steel poles? scoop only sells aliminium. i can see mtn and sentec tower where i am. i dont think wispernet wil let me use some of their heighsite space. i have one heighsite at klein karoo toyota and at my house.

Go to your local steel merchant and buy a 6m length of 50mmx3mm round tube.

Take it to a galvaniser and have them hot dip it.

I buy a lot of these and have now got our local Crawford Steel in Strand to supply them hot dipped. Our local galvanisers collect and deliver, so they pick up from the steelmerchant, dip it and deliver it back to them. The merchant then delivers it straight to site for me

 

[kilos]

where can i get the calvanised 6m steel poles? scoop only sells aliminium.
i have one heighsite at klein karoo toyota and at my house.

Steel & Pipes in George, you do not have to buy that from Scoop goto to your local Kooperasie.

 

[kilos]

+1.

We recently used two NS2's in Mazabuko, Zambia to get telemetry data from a farmer's pumphouse back to his office. There's a 27m VHF tower at the office. We popped the NS2 up there and pointed it to the other NS2 16km away as the crow flies.
Perfect connection.
.

No too far south from Lusaka where I am now
Excellent thanks for the example on the NS2, I see they have 1 10dBi Antenna.
Sorry no experience on the Avtech IP camera, that is an excellent price for an IP cam, can you post an example of an image.


Wireless security is pathetic in Zambia, a few years ago I could see Oracle Database traffic, banking transactions when I was in town. I bet nothing has changed

 

[Kameelperdza]

does it matter if the highsite with the accesspoint is 2 meter higher than the one that conects to it? a 6 meter steal pipe sounds heavy. maybe i must get support rods.

 

[portcullis]

Here you go, Kilos.
http://mybroadband.co.za/photos/showphoto.php?photo=12483&cat=500

The background to this lot.

We recently commissioned a new high site. It's not just a Routerboard. Apart from the wireless kit, there's IP connectivity, servers and some other stuff all sitting in a couple of cabinets in a lift room on top of a building.

All our kit is in locked cabinets, but there's an access control issue. Apart from me, the caretaker, the lift technician, the cleaner and the estate agent who manages the building all have keys to the lift room.

While we were testing and commissioning the kit, I left the doors and sides off the cabinets. A 3Com rackmount switch went walkabout at 6:44am last Saturday. Neither the SAPS nor I couldn't pin the theft on any specific person so I decided to install CCTV and to record anyone who walks up those stairs. We collected the camera on Friday, got it working on Saturday and are currently experimenting with options to stop false triggers. The white walls, the east facing window at the bottom of the stairs and the west facing window at the top of the lift room are unfortunately giving me a run for my money.

I've now set the trigger area for the floor only and ignored all the walls. That's stopped the shadows of birds flying past that were triggering events. It's also stopped morning windscreen reflections triggering events from the east, but somebody is going to have to walk into the room soon so we can confirm that there's enough contrast between the red floor and a pair of jeans / human legs for the camera to record.

But hey, if it works, R750 is a lot less than just one replacment 3Com rackmount switch.

 

[kilos]

does it matter if the highsite with the accesspoint is 2 meter higher than the one that conects to it? a 6 meter steel pipe sounds heavy. maybe i must get support rods.

Yes it does sounds heavy but in extreme winds it will not sway as much as a aluminum pole, here in George I have seen 6m alu pole without any support wires, and they certainly do sway alot in a strong wind especially with a 24dB Grid. I always say do the job properly in the beginning and their will be no repeats jobs.
2m is enough for seperation
I am talking from limited installation experience as portcullis and the WUG guys ie daffy can give more input.

Portcullis - Avtech 1350 with IR looks like its worth getting to see if its has average image quality. Have you got any images on the Vivotech with the Outdoor housing & Infra-red from Miro ?

 

[portcullis]

Calculate the fresnel zone and work from that.

http://www.terabeam.com/support/calculations/fresnel-zone.php

I have one 3.6km 5GHz link that spend the first 500m of it's life skirting over cluster home roofs (as in the aerial is 70cm above the rooftops) and I'm getting 16Mb throughput on that with -72 signal strength.

 

[portcullis]

When you erect a 6m glavanised pole there are a couple of things you need to remember.

It's heavy. You should have at least three brace wires at the top - preferably four.
You also need to think how you are going to get the pole up. Are you mounting it against the side of a building, or are you planting it on the ground. I actually like the concept of the flagpole. ie. You concrete two channel irons into the ground and then use a long bolt for the hinge and one or two more long bolts to secure the pole.
Something like this.
You also need to know how you are going to work on the thing. You can't put a ladder up against the pole. Well you could, but you'll probably end up in hospital, so are you going to use a cherry picker, or are you going to set everything up on the ground, haul the pole up, check to see if it's right, drop the pole and repeat?

If you are going to provide a commercial service from the top of the pole, you need to be able to get to the kit up there at a moment's notice...at three in the morning...if needed.

One last thing. Plug the top and the bottom of the pipe, or you will end up with a single pipe, pipe organ.

I know lattice masts are more expensive, but the long term operating costs are less. You only need a footplate, 2x3m lengths and one bracket to bolt equipment onto. It's much easier climbing a lattice mast than struggling with a cherry picker.

 

[Kameelperdza]

im planing to put it up againts a building. maybe put two 15cm brackets at the bottom and put 4 strain cables on the top and in the middle. i wil have to google what a chery picker is. wish i could just buy a 10m lattuce tower. do u maybe know where?or is their any how to on making my own.im afraid of heights so the best option wil be the best

 

[kilos]

i wil have to google what a chery picker is.

Local electrical muni department use them to do maintenance on the street lights, normally mounted on a truck or can be on a trailer too

Portcullis - Outdoor Avtech with IR

 

[Kameelperdza]

oh yes ì have seen one of those on the ctwug galery.

 

[portcullis]

I looked into renting one and discovered that the cost to rent one from Sale's Hire in Somerset West for ONE DAY is exactly half the price of a second hand unit in the UK.

So I bit the bullet and bought one that ex Ministry of Defence. It's sitting at my house over there and will be shipped out with some other stuff that needs to come out here in about two months.

 

[portcullis]

im planing to put it up againts a building. maybe put two 15cm brackets at the bottom and put 4 strain cables on the top and in the middle. i wil have to google what a chery picker is. wish i could just buy a 10m lattuce tower. do u maybe know where?or is their any how to on making my own.im afraid of heights so the best option wil be the best

Call Tim at Scoop. They have some lattice towers that are taking up space in their warehouse.

This 6m pole is against the side of a building with that big frame to brace it against wind. The aerials at the bottom point to high sites / backbone links while the ones at the top are for clients. We've still got to bolt a couple of sectorals on to complete the installation.

http://mybroadband.co.za/photos/showphoto.php/photo/12486

Kilos, Uniterm tell me those cameras are winging their way to SA. I'm looking forward to getting one and putting it up against the Miro one.

 

[kilos]

portcullis - a nice solid brace and not an Ellies Electronics TV special

 

[Kameelperdza]

how much do you think he will ask and what is the hieght? I would like to put one in my garden so that i can remove the antenna pole i mounted againts the roof.