wi fi extender diy antenna - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th July 2013, 06:58 AM   #1
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
Default wi fi extender diy antenna

Sorry not audio related but thought some of you guys would know.
I have a wi fi extender with four on pcb internal antennas
But the signal I am getting from the free WiFi area beach is marginal. I am thinking of making a diy yagi antenna to boost the signal by about 10db but do I connect it to any internal antenna on the pcb?
__________________
``The author always assumes that when power is applied , the amplifier will explode or ,at the very least, catch fire.
Morgan Jones, Building Valve Amplifiers.
  Reply With Quote
Old 26th July 2013, 11:05 AM   #2
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
Unless you can tap into a point that matches the 50 ohm coax feeding your antenna, you may loose more signal than your antenna can get you due to impedance mismatch.

Best are the units with detachable antennae...that you can work with.

There are many articles about "coffee can antennae" for wifi on the net and some of them may address the impedance mismatch issue.

Have fun.

__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 26th July 2013, 05:15 PM   #3
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
Hmm good point. I guess the impedance match is with a capacitor?
__________________
``The author always assumes that when power is applied , the amplifier will explode or ,at the very least, catch fire.
Morgan Jones, Building Valve Amplifiers.
  Reply With Quote
Old 26th July 2013, 05:33 PM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
I am having trouble visualizing what you have and
want to do with it. Could you post a picture.
  Reply With Quote
Old 26th July 2013, 10:13 PM   #5
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
Quote:
Originally Posted by protos View Post
Hmm good point. I guess the impedance match is with a capacitor?
At these frequencies anything with length can be an inductor and anything with area can be a capacitor.

And your impedance matching may require a couple of each.

I don't even consider trying this modification an option.

If you had a unit with a detachable antenna...
__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote
Old 26th July 2013, 11:31 PM   #6
diyAudio Member
 
Join Date: Oct 2005
I use one of these, after reading many good reviews....

Alfa AWUS036H Upgraded to 1000mW 1W 802.11b/g High Gain USB Wireless Long-Rang WiFi network Adapter with 5dBi Antenna - for Wardriving & Range Extension: Amazon.co.uk: Computers & Accessories

I have a DIY cantenna which is directional, and a +9db omni antenna.

It's only b+g but this is rarely an issue if you're trying to connect to free public wifi.

I'm sure this would work well with a yagi. I got best results using no rf cable and directly connecting the unit to the cantenna using a coax termination adapter (can't remember the exact type). A long USB cable (with active extender if required) is less of an issue than a lossy coax.

If you search google you can find out how to increase the tx power beyond normal levels. It's a simple process, although you might accidentally exceed legal limits in your region. I obviously haven't done that, but believe the benefits can be significant.

Please show us your solution when you've finished the project.

Last edited by sharpi31; 26th July 2013 at 11:33 PM. Reason: Typo
  Reply With Quote
Old 27th July 2013, 06:55 PM   #7
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
This is the PCB . As u can see there are two little add on PCB with squiggly antennas and behind them are two PCB antennas one of which is a metal plate and the other is just a track on the PCB.
Attached Images
File Type: jpg IMG_20130722_150416.jpg (100.8 KB, 93 views)
__________________
``The author always assumes that when power is applied , the amplifier will explode or ,at the very least, catch fire.
Morgan Jones, Building Valve Amplifiers.
  Reply With Quote
Old 27th July 2013, 08:29 PM   #8
pilli is offline pilli  France
diyAudio Member
 
Join Date: Aug 2006
I've had good success with a parabolic reflector screen, although it won't work easily with the device in your picture.

The parabolic thing is much easier to build than a cantenna or a yagi. Probably much less effective, but it literally takes 20 minutes to give it a try: all you need is some paper where you print the proper pattern and some aluminum foil. Search on internet for "parabolic wifi reflector".
But the antenna must be in the focus point, not easy to do in your setup.


-
  Reply With Quote
Old 27th July 2013, 10:49 PM   #9
protos is offline protos  Greece
diyAudio Member
 
protos's Avatar
 
Join Date: Mar 2002
Location: Athens+Addis Ababa
A yagi diy is very easy just a piece of 1 meter 1 cm2 wood and a meter of copper wire is needed.
The question is will it work if I attach it to the existing antenna network and where.
__________________
``The author always assumes that when power is applied , the amplifier will explode or ,at the very least, catch fire.
Morgan Jones, Building Valve Amplifiers.

Last edited by protos; 27th July 2013 at 10:52 PM.
  Reply With Quote
Old 28th July 2013, 05:08 AM   #10
DUG is offline DUG  Canada
diyAudio Member
 
Join Date: Jan 2003
Location: mississauga ontario canada
yagi design online:

Online Calculator .:. Yagi Uda Antenna

(not really so simple)

The other thing about Rf (besides the "anything with length can be an inductor and anything with area can be a capacitor") is that with inductance and capacitance come a characteristic impedance.

And if the characteristic impedance is not utilized correctly you can end up with an RF short circuit at a point that can measure open circuit with an ohmmeter.

The Circuit Designer had to match the impedance of the antennae to the transmitting and receiving devices. There might not be a point where the impedance matching networks transformed to a point where you can tap in with a 50ohm (or other) load.

You might not affect the circuit at all. Which is OK for the circuit but you will not be extracting any power to transmit with.

Or you may detune the existing circuit to either present a higher impedance load to the transmitting device and not get any power for transmitting or present a lower impedance and blow up the transmitting device.

Just sayin.

__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: KINDLE W/3G AND WI-FI drptpcpe Swap Meet 0 26th February 2012 04:07 PM


New To Site? Need Help?

All times are GMT. The time now is 02:59 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2