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# Risa tower input #help

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## Risa tower input #help

(OP)
Im begginer with risa tower program while im adding the discrete loads informations i dont understand what the meaning of CaAa (Front&side) and how its calculated cause i was studying the tia-222g and i cant found how i calculate CaAa for the risa tower input.
for your knowledge i have sector with these geometry (2254 height & 259 width & 99 depth all in mm) how i can calculate the CaAa front and side for the Risa input.
And whats the refrence of Risa calculation CaAa while im using code design (TIA-222G)
Thank you.

Mr.kreddan
Replies continue below

### RE: Risa tower input #help

Cs is the force coefficient for a discrete appurtenance.
Aa is the projected area for that discrete appurtenance.

Most antenna manufacturers have this info (at least the area) for their antennas). If not, there is some information in Annex C on how to calculate this. It's not a lot though.

Thanks for posting. It's been awhile since I pulled out my TIA code and it's nice to flex those muscles every once in a while.

If I were still with RISA, I'm sure I would have some training material on the subject. If you're still somewhat confused, let me know and I'll dig through some of my old files and see if I can find an example.

### RE: Risa tower input #help

(OP)
Thanks JOSH i done it like you said it's not tough.
and if i have any other question i will let you know to refresh your knowledge about TIA :)
Thanks again

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