Wednesday, July 30, 2008

Inside 2.4Ghz Flat Panel Antenna

I've found documentation about 2.4 Ghz flat panel antenna
(http://www.dd-wrt.com/phpBB2/viewtopic.php?t=5026)

Parts List :

  • PCB 25cm*25cm
  • Reflector - 283 x 283 metall plate distanced at 5 mm from CUPRUM LAYER of our PCB!!
  • N-female connector
Then :

just solder N-type socket in the center of the circle..you can follow the step from this gallery..:)
good luck...

here's a gallery about it:










You can download the corel pattern here



Tuesday, July 29, 2008

Do It Yourself : PoE — Power over Ethernet




How-To power over your ethernet cable to an access point

by Terry Schmidt (http://www.nycwireless.net/projects/poe-power-over-ethernet).

A number of Access Point manufacturers (Lucent, Symbol) are now offering Power over Ethernet add-on’s for their Access Points. A module inserts DC voltage into the unused wires in a standard ethernet cable (pairs 7-8 and 4-5). The idea is to supply the AP’s power and

UTP ethernet connectivity requirements via a single ethernet cable. This works great in areas where you may not have power and/or ethernet easily acces

sible, like a roof. This also allows you to more easily place the AP closer

to the antenna, thus reducing signal loss over antenna cabling. Ethernet signal travels well over CAT 5 cable; 2.4ghz signal doesn’t do as well over antenna cabling. Also ethernet cabling is much cheaper than antenna (LMR-400) cabling. There are currently two types of adapters: a module jack or hub-like device for multiple access points. The following hack creates a simple module pair.

Supplies

Parts $ Tools
2 Port Wall Mount Module $11 Multi-meter
1 Port Wall Mount Module $8 Wire Cutters or Scissors
DC Male Plug $3 Electrical Tape
DC Female Plug $1.50 110 Punch Tool (Nice but not required)
RJ45 Crimpable Plug 0.50 RJ45 Crimping Tool
Short Ethernet Cable Scrap $0 Soldering Iron, Solder
Total $24

The 12 volt Apple Airport and the UGate 3300 use a 2.5mm Inner Diameter and 5.5mm Outer Diameter Coax DC Power Jacks. Other Access Points may use different sizes. (Original Linksys WAP11 (5 Volt, 2 Amp) uses 2.1mm Inner Diameter, New Linksys WAP11 uses a 5.5mm Outer Diameter and 2.5mm Inner Diameter) By using less expensive Wall Mount Modules (not CAT5 spec), or not using them at all, you can reduce the parts cost of this project. :)

Step by Step

  1. Solder wires to the DC Male Power Plug. Solder one pair (2 wires twisted together) to the inner contact connection. This will be the positive power wires. Solder another pair to the outer-contact connection. Notice that on this DC Male Power Plug there are 3 connectors. One is for the center pin, one is for the outer surface, and one goes to the plug housing. You do not need to solder anything to the plug housing connector. This is what it should look liked when finished.

  2. Drill a hole in your two-port mount housing. Mount the Male DC plug in the housing.
  3. Connect the wires in your 2 port jack as follows (also refer to Diagram at bottom of page) (Note: this is the Intel, Symbol, Orinoco Standard, not the Cisco standard for wiring).

    Input Jack
    Output Jack
    DC Plug
    Pin 1 <-> Pin 1

    Pin 2 <-> Pin 2

    Pin 3 <-> Pin 3



    Pin 4 <-> DC Positive Wire 1


    Pin 5 <-> DC Positive Wire 2
    Pin 6 <-> Pin 6



    Pin 7 <-> DC Negative Wire 1


    Pin 8 <-> DC Negative Wire 2
  4. Wire the one port wall mount jack as follows:

  5. Input Jack
    Output Jack
    DC Plug
    Pin 1 <-> Pin 1

    Pin 2 <-> Pin 2

    Pin 3 <-> Pin 3



    Pin 4 <-> DC Positive Wire 1 -> Center Connector


    Pin 5 <-> DC Positive Wire 2 -> Center Connector
    Pin 6 <-> Pin 6



    Pin 7 <-> DC Negative Wire 1 -> Outer Connector


    Pin 8 <-> DC Negative Wire 2 -> Outer Connector