Radio Frequency Communications

I have no idea at all what any of that means.

Oh good,, I thought I was loosing my mind, it made no sense at all.

2.4 Ghz is promising. Make a prototype and try it out.

Googled FCC 15.231e compatable short range communications

http://www.google.co.uk/search?hl=en&newwindow=1&rls=com.microsoft:en-gb:IE-SearchBox&rlz=1I7GZEU_en&&sa=X&ei=hJk9TMLEKceC4QbL-ZHGAg&ved=0CBQQBSgA&q=FCC+15.231e+compatible+short+range+communications&spell=1

any use ?

Dont let guest see it he/she will complain

Question ?

Does it have to radiate signal in all directions ie omni.

or can it transmit to a single point ?

and if it uses gprs you encode error checking to help with problems of interference, ie send information in packets error check then if ok another packet if not resend last packet.

could you also specify what sort of area it is going to operate in, indoors/ outdoors electrically quiet/noisy

http://www.directindustry.com/prod/brodersen-controls/gprs-communication-module-12459-108387.html

http://www.simplesolutions-uk.com/?_kk=gsm%20module&_kt=e382a5ed-30f5-4c22-af66-c18e975edefd&gclid=CO-Nupn16qICFRM-lAodwDMrbg

GPRS Comms Modules

http://www.google.co.uk/search?q=gprs+communication+modules+australia&sourceid=ie7&rls=com.microsoft:en-gb:IE-SearchBox&ie=&oe=&rlz=1I7GZEU_en&redir_esc=&ei=8J89TL7WGJj40wTtsLDQAw

Very Good looks like fun.

so the radio modem comuunicates back to a central point then for scoring ?

i assume hit info after being shot is stored on the target vest ?

The original spec specifically requested no scoring, this was to promote teamplaying and stop one upmanship. Over the years as its developed the users and operators have requested more of this ability though.

I haven't seen one of the vests actually, currently there are multiple modes available for any device from master controller to any weapon or mines and medic and ammunition resupply posts. More modes are likely to be added as time progresses.

I can't for obvious reasons go into future development areas.

I could really use some pointers with the RF, specifically with regards to what the FCC will allow that is as simple as possible to implement in hardware and software.

Its looking quite difficult currently.

just an update ..

Looks like we are going to give Zigbee or preferably MiWi a go using MRF24J40MB modules from Microchip, these are a module using the IEEE 802.15.4 (2003) standard and have FCC compliance so long as transmit power is under -1.9dB.

For that o/p power I could use the MRF24J40MA module which has no PA or LNA, but the LNA gives 10dB more sensitivity and will be required I expect.

I figure it will be far quicker in the long run to port the existing MiWi code than developing my own peer to peer code which without a mesh is unlikely to work very well over 100m at those power levels.