How can I purchase the LTR standards?

[SZHYT]

I want to gain the LTR standards but I don't know how to get it ,
So if anyone know,please tell me ,thanks!!

[N_Jay]

Originally Posted by SZHYT

I want to gain the LTR standards but I don't know how to get it ,
So if anyone know,please tell me ,thanks!!

I don't think they are a standard of any kind.

Some may have licensed the protocol from EFJ, but I think many have just revers engineered it.

[SZHYT]

Thank you very much.

What about Passport ?

How can I get this protocol?

[kf4pep]

For Passport you must contact Trident Microsystems, depending on your application they will work with you to make it work.

However I doubt very much they will just hand it over to anyone. What type of project are you working one?

[cg]

The US Patent site has lots of LTR info. The Patents can be difficult to read until you get used to the reference numbering but there is lots of info there. Each link in the beginning of the patent is referenced material and can yield even more details
Try these:

http://patft.uspto.gov/netacgi/nph-P...S=PN/6,804,529

http://patft.uspto.gov/netacgi/nph-P...y=PN%2F5159701

This link has some basic LTR info
http://www.optoelectronics.com/tech/pdf/ltr_faq.pdf

[slicerwizard]

Originally Posted by SZHYT

What about Passport ?

What would you like to know? What application (if any) are you planning?

[wayne_h]

I've yet to find anything legally binding one to go through Trident for implementation of PassPort. They hold no patent on the protocol that I could find.

I'm no lawyer but I don't see what's to stop someone from reverse-engineering it and using it (for a passive application).

[kf4pep]

Originally Posted by wayne_h

I've yet to find anything legally binding one to go through Trident for implementation of PassPort. They hold no patent on the protocol that I could find.

I'm no lawyer but I don't see what's to stop someone from reverse-engineering it and using it (for a passive application).

Call and ask them, they seem to be a pretty opne bunch... but all the big players are listed as "licensees" of the protocol, and if they could be using it for free I would suspect they would be.

I take that back, found this:

"Trident Micro Systems will provide free licenses to qualified radio manufacturers. Rhett Grotzinger, vice president, said, "This protocol is going to allow today's SMR to stay competitive with other forms of wireless communications."

http://mrtmag.com/mag/radio_news_32/

Still, I doubt just anyone can use it. I will ask my friend who works for Trident next time I talk to him... I do know he has said they will never license a scanner for Passport.

[SZHYT]

Thanks verymuch,everyone!