a noob question about pcb

[testing]

]Hi everyone I got this question about pcb board types and where to purchase larger size pcb board up in Canada need it for a project I'm trying to start..
Well i was wondering if anyone know what type of pcb this .. its white or cream in colour..
http://img695.imageshack.us/img695/3552/ds240021bu5.jpg







I'm trying to start working on this but.. I can't seem to find a place to purchase this type of pcb. but I'm all new to this so.. I need a bit of help on this

thanks.....

[Snow_Cat]

• http://www.zero13wireless.net/foro/arch ... -3573.html
• http://translate.googleusercontent.com/ ... RfAojvsIvg
• http://translate.google.com/translate?h ... rmd%3Divns

According to the most often reposted thread it is an epoxy only (no fibreglass) board, though differing weights and board thickness produce differing results, these have not been collected.

You might try using ordinary FR4 epoxy to start with, as that is the most commonly availble from suppliers like Digikey.com, and other eletonics hobby shops.

More information:
http://www.digdice.com/14dbi-18dbi-and- ... 5ghz-band/

[testing]

thanks for your quick reply Snow Cat..
I have visited the link site you sent many of times and have spend a lot of time reading the forums they are some of the best sites I have seen... there are some Russian and Polish site that are very good too.


I just find having the sites translated a lot of information is lost.. or just hard to understand.....

Maybe it just me...

I was just wondering since you know these sites; have you tried making any of the designs of antennas from any of the sites?

[testing]

thanks for your quick reply Snow Cat..
I have visited the link site you sent many of times and have spend a lot of time reading the forums they are some of the best sites I have seen... there are some Russian and Polish site that are very good too.


I just find having the sites translated a lot of information is lost.. or just hard to understand.....

Maybe it just me...

I was just wondering since you know these sites; have you tried making any of the designs of antennas from any of the sites?

[Snow_Cat]

Not in a very long time.

I can follow instructions to build things; however my ability to caclulate the performance of a given design is lacking...

[testing]

P know what you mean by testing.. I have tried the usual cantenna biquad.. thing..and have also build a large cardboard horn atenna.. but I have not been able to really test the performance of the items.. i have also tried a circle patch and the curtain quad and a mod mulitable quad from digdice site..but was still unable to see any true performance gain from them.. the only one which seems to work to any degree has been my ugly cardboard horn..but anyways I have finally broken down and have ordered a couple of panel antennas from ebay.. two look home made.. and one commercial unit .. just to use as a reference unit..an old tranzeo mesh unit..15db
I have been using the kismet and xirrus software to compare...signal strength but really need a RF spectrum analyzer''

So anyways I am hoping to... after i finally get all the materials needed , to try to construct a couple of panel patch antennas.. I have finally found all my connectors and a little bit of cable..(hard to find cable here with copper shielding for easy soldering for buads)

I just have to find the right pcb in a large size.. to start...got any tips on a couple of design which may work out?

[Snow_Cat]

:/ I've not experimented enough to know what designs are good, just that fractals are very forgiving of carelessness.

[testing]

I'm not sure what you mean by fractals ?

do you mean reproducing design dimensions...accurately. since wifi is in the microwave frequencies?

or fractal antenna design which is a new area of micro antennas design they are starting to use for multi frequency antennas?

[testing]

just found a new site.. not sure if you seen this one http://foro.jotahacker.es/antenas-wifi/" onclick="window.open(this.href);return false;

[testing]

just found a nrw site not sure if you seen this one http://foro.jotahacker.es/antenas-wifi/ ... 973.0.html" onclick="window.open(this.href);return false;

[Snow_Cat]

Fractal design antenna. And the only 'new' part is that there is science supporting it.

I used a variation on the "Koch Snowflake" { _/\_ } on a garage door opener back in the 90's and found that it extended the antenna range to the end of the street (couldn't observe from a further distance). My dad was quite angry that my 'stupid wrigggly shape' worked better than his precicely textbook sized whip antenna and 'fixed it' according to the design rules in the books he was working from. Results from this 'correction' were not good.

The wide BW of a fractal antenna makes it especially forgiving of imprecision in segment length- this is what allowed my arbitary 'wiggly shape' to outpreform my dad's matched to a thousanth-of-an inch wave length antenna.


Reproducing a shape from given dimensions is easy. Looking at a given antenna design and calculating the BW, scatter pattern and effective amplication is something I've never really quite grasped.

[testing]

Well now I understand how the Ham Guy can spend years playing and tuning antennas...from the outside.. looking mechanically antennas are very simple looking.. but there is so many factors involved..just look at what happened with the I-Phone...that would of been a prime candidate for a fractional style antenna with the multipliable freqs they needed to tune to...

But your right regarding engineering..antennas.. I just started to play abit with nec2 but find it a steep learning curve.. especially not having the background for it .. coming more so from the mechical side of life...thus the pirating already designed units...and trying to hopefully tuning then slightly..hoping that there might of been a slight compromise some where in the original design due to cost,time material constraints..

I do find itvery very interesting that you designed a fractional antenna.. I haven't come across to much information regarding that style..is there a site where you might of based your design from..? the only areas they mighy beusing that type of antenna from what in can see from my little knowlege that i have is for cellphones and maybe the military ...in guidance systems

[Snow_Cat]

I didn't have a reference of any type for that first antenna, I'll spare you the sob story explaining that conest and; I understood by playing with scrap circuit boards that {wires of arbitary length, bent at arbitary angles, combined in an arbitary manner} worked very well across the FM/FM2/SW/UHF bands. And that there must be some set of rules describing how it works. Not knowing what these rules actually were (and forbidden from even looking at any conventional references by the contest) decided to create an almost arbitary set of rules approximating the patterns seen in the boards that worked best; with the logic that a structured 'wiggly line' would be more likely to work than a random one.

Today, when I am looking for references to learn something I look at books.google.com, scholar.google.com etc. and speed read everything I can.

Even if I don't understand what I read enough of it sticks for me to figure it out later when I start ordering the information.


I wish that I had been aware of NIC2 when I was studying. That could have made some of my assignments a lot easier.