Treo Antenna Hack

Place to discuss electrical design, tweaks, etc
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spymongoose
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Post by spymongoose » Tue Nov 15, 2005 8:30 am

Well...
The 2.0 antenna uses the cable itself as the poles. The cable is seperated and sent opposite directions, so you will need at least 1/4 wavelenth. I reccomend as much as 1/2 inch or so extra from that 1/4 wavelenth measurement and then trim the leads to the exact lenth you need.

This much I have done to the prototype antennas so far, and I can test them like this. the trick is protecting the antenna and keeping it straight. I had a couple of good ideas, Im just looking for a simple way of implementing them. That is the holdup... keeping the antenna build cheap and simple so anyone can build one.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

bww143
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2 questions.

Post by bww143 » Tue Nov 15, 2005 11:44 am

Ok I made the antenna, and I can not get it to work quite right.

when you put the tape on the silver insulation, you do leave at least the last part of it unshielded to connect to the chock block, right? Also, do you put tape over the copper shielding as well? Thanks for your help

bww143
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followup

Post by bww143 » Tue Nov 15, 2005 12:21 pm

I think the reason I am not sure if it is working is when I cover the treo antenna, according to the signal meter the RSSI goes up quite a bit. Mabey this is normal? Not sure. Thanks

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spymongoose
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Post by spymongoose » Tue Nov 15, 2005 4:41 pm

hmm... There was a 10 or so jump in rssi on average on the first prototype. Here is a quick dump of the pics I was going to upload to the wiki demostrating how to build a 2.0 antenna so far.
Hopefully this sheds some light...
Image
Image
Image
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Image
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

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spymongoose
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Post by spymongoose » Sun Nov 20, 2005 4:22 am

I put those pics up in the wiki, along with some instructions. They should be the backbone of the 2.0 antenna design.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

johnnytk36
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Post by johnnytk36 » Sun Nov 20, 2005 1:46 pm

I used solder to make the wires stiff and then i put it inside of a tube from a ball point pen and then i super glued each wire to the bottom of the tube so the wires would keep their 180 degree of staightness.

I can't post pics of me building it since i have already finished it. I have more adapters ordered so i can make one for the 850 frequency. The one i made this time was for the 1900 frequency. I get better reception but not much. I can't be sure if this design is much better since when i talked to the guy at my local cingualr store he said we used mostly the 850 frequency around my area. When i get one made for the 850 frequency i hope my results will be much better.

I don't know if solding the wires effected the reception any.

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spymongoose
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Post by spymongoose » Mon Nov 21, 2005 1:15 am

My original antenna design was very similar to what you did. I soldered the wires onto the poles and it worked pretty well. You should definitly make an antenna that works with your local towers though.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

nonobeez
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Post by nonobeez » Wed Nov 23, 2005 3:27 pm

How about getting the original antenna to work better? Or making a new one that goes in the original place.

What if it looked something like this, what could be done to optimize it for the 1900MHz range?

Image

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spymongoose
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Post by spymongoose » Thu Nov 24, 2005 4:03 am

Well, if you look at the traces on the antenna you will see 2 paths. One (the short one) is tuned to 1900 mhz and the other (the long one) is probably tuned for 800 or 850 depending on if it was CDMA or GSM. The "coils" are a decent hi-gain antenna and have a fairly even radiation pattern, but by having 2 antennas feeding signals into each other out of sync you get what is called "noise." I work on the assumption that a single freq antenna with no frills or compromises will work better than a dual freq antenna. By tuning a straight dipole antenna we sacrifice compactness for performance. That is why things are done the way I have done them. If I ever design antennas for mobile devices professionally I will do things very differently that how they are done nowadays.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

nonobeez
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Post by nonobeez » Thu Nov 24, 2005 6:21 am

Spy,

Well, this is the 650 antenna. I have now taken apart many and I found out that they are all the same! Well, except for exterior color. I though it was funny when I noticed a parts phone I had was pieced together and the antenna was labeled "Ver"

I have done some modifications, but have not done complete testing on all the variations. My present antenna is "hard-wired" to the phone.

I have a backup 650 I should have working next week and I will start to test diferent vaiations of my mod. I will fill you in on the results later.

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spymongoose
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Post by spymongoose » Thu Nov 24, 2005 1:52 pm

Yes, Yes, I would love to hear all about how you have modified the stock antennas. What do you have in mind? Have you compared the CDMA antennas vs the GSM antennas?
If I were to attempt to modify a stock antenna I would cut away the potion of the antenna that is for the opposite freq from the target. For example, if I had a sprint phone (and I do) I would cut away the larger of the 2 antenna traces in an attempt to reduce the noise of the out of sync signals. But that is what I would do only if I was confident that that would have any actual benefit.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

nonobeez
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My antenna Hack is done!!

Post by nonobeez » Sat Dec 03, 2005 9:32 pm

Done for now. Well, atually I have been usingit and testingit for awhile. check it out a http://www.treotricks.com

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spymongoose
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Post by spymongoose » Sun Dec 04, 2005 4:53 am

Nice site nonobeez! And good work on the treo. I'd love to see how you do the treo antenna.
Talkabout T900 --> Handspring Visorphone --> Kyocera 7135 --> Treo 600 --> Apache PPC 6700 -->Nokia 770
http://www.shadowmite.com http://www.ppc6700users.com

nonobeez
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Post by nonobeez » Sun Dec 04, 2005 6:21 pm

Thanks Spy!!!

You know, I have spent tons of time and $$$ on trying to get this (and other things) done. This coming week I plan on releasing a how-to for installing the antenna. As for actually making the antenna, I will probably hold off until Jan. I want to at least make some christmas money to pay for my addiction!!!

The patent will not make any money for me, but I did it just in case. I feel it will be a good learning experience, but I already have other designs and those I will try to show to Palm and Apple and ??? first. It will be a busy week...

Once I get some of my extra phones fixed (bad ROM upgrades) I car resume my antenna testing and we can revisit hacking the original antenna.

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Post by migEL » Sun Dec 04, 2005 9:19 pm

thats a cool antenna mod nonobeez. hows the sound quality on the headphones? is the volume much differnt? thanks
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