Category Archives: Technical

Wireless Point to Point Connections (where cabling/fiber is not an option)

I was asked last week about the cheapest method to connect a remote site to a central site that was within line of sight.  I pulled up an old article I had written and re-posted here for reference.  If you are not technical, or don’t have a need, just feel free to gloss over and wait for my next post! 🙂

Thanks

C

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Do you have a site that is just out of reach of your physical network?

Maybe a remote warehouse across a field, or maybe two building that are separated by a public street?  Getting right-of-way permits and hiring a professional boring company to come in and push underground pipe may be too time consuming and costly.

Consider installing a wireless point to point network. 

Considerations:

  • No special FCC Radio licensing required if using standard 802.11 spec devices.
  • Devices must stay below 1 Watt of Radio Power to remain within the rules.

Requirements:

  • You need Electrical Power at both ends
  • You need line of site (a direct path between antenna locations) between each end that is unimpeded by electrical lines, trees, buildings, traffic, water towers, etc.
  • Less than a mile without involving a professional wireless engineer.

Types of Point to Point Antennas:

  • Yagi – Directional Antenna that is just the size of large paper-towel roll.
    Example:  WIFI-LINK
  • Mesh Dish – Larger profile, but connects much further than Yagi.  Requires more sturdy physical mount than yagi.  Has some movement in wind.
    Example: WIFI-LINK
  • Solid Dish – Requires strong mount pole and strong mounting accessories.  Use for long distances with maximum radio effectiveness.
    Example: CISCO

Sample Parts List using a Mesh Dish Antenna.

Note: I included spare wireless access points, since these guys get hit by lightning on occasion.  Also, if you want good isolation, installing ethernet to fiber transceivers at the entry to your building, you will have optical isolation (preventing lighting from entering the building) across your fiber lines.

Parts Description Qty Unit Price Extended Price
Wireless Access Points Production Linksys WAP54G 2 $72.79 $145.58
Wireless Access Points Spare Linksys WAP54G 2 $72.79 $145.58
Cabling Kit LLC400- TNC male RP & N male connector 1 $270.18 $270.18
Ant to Amp Cable N male to N male(LLC 100/50cm) 2 $10.81 $21.62
Amp to WAP Cable N male to TNC male RP(LLC 400/1m) 2 $21.83 $43.66
Directional Ant. 2.4GHz Square GRID Parabolic Antenna 19dBi 2 $45.00 $90.00
Ant to Lightening Arrestor Cable N male to N female(LLC 400/6m) 2 $20.86 $41.72
Lightening Arrestor LP N MALE TO N FEMALE 3GHz 1 $9.35 $9.35
Mast Extension Tessco Cantilever Wall Mount Kit with 96″ mounting pipe 2 $170.00 $340.00
Grounding Parts Grounding Wire and accessories 1 $60.00 $60.00
Amplifier High-Gain Amplifier for Ant. Over 12DBI 2 $176.79 $353.58
Shipping Shipping: 1 $165.00 $165.00
Total: Total: $1,686.27

Sources:

802.11 Limitations

CISCO

EIRP Calculator

TESSCO

WIFI-LINK.COM

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Cool things this week 10/7/2011

The Most Amazing Time Lapse Video (Nature)
Make sure you open this in full screen mode (icon in bottom right-hand corner)
I love the nature (God’s Creation) aspect.

I have been enjoying the Internet’s greatest music application “Spotify” this week.  I totally recommend it.  It is not available in all countries yet, so they are still working out licensing deals to support their product.

At work I have been spending a lot of time on 2012 Capital Planning. (Projects)  It has been pretty interesting.  It is tough to balance the needs of a company.

At home I have been reading to my oldest daughter, “Big M.”  She is five years old, in kindergarten and is learning to sound out words and is not just memorizing books anymore but actually learning to read!  We also got to harvest our crop of sunflowers that she planted this spring.  I brined the sunflowers for several hours, then boiled them in the same solution outside on the side-burner of the grill and then smoked them for several hours on medium heat inside my electric smoker.  Big M likes the plain version, while I am enjoying some of the smoked ones.

Little M, my youngest daughter had a sore throat early this week.  I got to spend my evenings comforting her and growing closer together.  She is healthy now and is running around the house as fast as can be.  (Almost 3 years old.)

I wont promise to blog all the time, but this is my start.

C

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Filed under Personal, Technical