Wanted: N900
 

I am looking for a n900, not necessarily in working condition.
I can get access to a machine that can scan the parts to get a digital model of it. So I will be able to design a body in metal for the N900.

Re: Wanted: N900
 

You may want to see this:
http://talk.maemo.org/showthread.php?t=83928
Maybe it would be more productive to join forces? My project for it is quite advanced. Coincidentally, access to 3D scanner is the thing I'm currently lacking, and it was slowing down progress quite a much (needed to re-design everything manually).

/Estel

Re: Wanted: N900
 

it interesting to see more people getting involved in creating metal bodiy for N900. Can you people show us a preview of what you are people are making ?

Re: Wanted: N900
 

150§ in indian rs?? If that antneea thing gona increase range count me in:)

Re: Wanted: N900
 

Yeah, mettal housing will shield all forms of radiation so external antenae are pretty much a must.

Re: Wanted: N900
 

you mean to they would used just to claim the lost raditaion back:eek:

Re: Wanted: N900
 

Yes.

10 chars

Re: Wanted: N900
 

I have been following your project from the beginning and am aware that you were measuring the device up. One of the first thing I was going to do is share the scanned images with you ;)

But my first design is different than yours. I am trying to make one with keyboard below screen, thinner device with place for 2 batteries side by side.

I'll probably also make one normal, just like N900, but with lesser volume and maybe full USB.

No not necessarily. I'll have a cutout with plastic at the place of antennae, just like iPad.

I don't have a preview yet. I'll start next week. This week I still have exams :(
But I do need a device first to be scanned in! I use my own as a daily driver.

Re: Wanted: N900
 

Thanks a lot :) Yea, I, of course, remember you from there - was unsure if you may have forget about it (as I'm so slow to deliver :o :()

Ah, that kind of beast. Well, the more choices, the better :)



In case of GSM radio, it causes - sadly - quite a lot of directionality (for other types, like WiFi, too, but not as much, due to lower operating range as a whole, and higher frequency). This is, probably, reason why N950 sucks so much @ signal strength compared to N900 - even despite clever helical antennas design (similar to helicals found in early mobile phones). I'm sure they aimed at getting circular polarized waves - ideal for devices, which should work no matter of position/angle toward base stations - but, due to limited space and reflectors (metal parts behind and between), it seems to produce either vertically or horizontally polarized one. This result in super signal when aiming device at "correct" angle, and 80% worse, when changing it just a 40 degrees (both numbers made up, to give and idea of what I'm talking about).

Consider, that iPad is designed to work with WiFi, not GSM/3G - especially the former will get affected.

Heck, I had quite a experience with designing antennas, but after starting body replacement project, I feel like I've studied for master thesis in antennas theory. (Damn, even during checking something for this every post, I found myself spending ~4 hours of constant reading, because I noticed interesting information in one article that may affect work on project, then followed link after link...)

And even now, I know just a tiny fraction of how those things (should) work - I'm absolutely amazed by talent of antenna's design pioneers, especially those, who did it in pre-personal computer era... What they achieved using just trial and error and manual calculations is AMAZING - you could literally spend a lifetime, just tweaking one design for one purpose (and sometimes, they invented quite a few).

Summing it up, maintaining non-worse signal for metal body replacement - of any shape - is a, sorry for word, "b|tch" of a task (mostly responsible for my delays in delivering hardware awesomeness to thirsty "masses" ;) ). Don't underestimate it - personally, I'm, sometimes, cursing myself for not promising wooden replacement (which, depending on type of wood used, may be much more elegant than metallic one, without practical differences in heat dissipation), instead of metal one. I plan to keep working on it for some time in hope for getting decent reference implementation for metal-body N900 - but, if it keep failing, I'll do a survey around per-orderers, if they would accept wooden variant, instead.

/Estel

Re: Wanted: N900
 

Wow Estel, you really seem to be very knowledgeable about this subject. Thank you for all the information. I think I'll consult with you when I get to the design-antenna part ;)

Do you thing it would work if I put the antennae on the outside of the structural metal body? That the antennae only on one side have the metal?