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d .
S om e o f t h e k ey f e atu re s o f t h is a n te n na a re :
· Ban dw id th i s 2 80 M Hz
· VSW R i s < 1.6
· Gain 3 .5 d b
· Ante n na l e n gth i s 1 20m m
· Cab le t y p e R G 174



      

  
Em bed ded P ro je ct- E C E 5 101 Pag e 8

F
ig u re 5 .a G SM -J C 01-N A ( G SM a n te n na f o r G M 28) F ig u re 5 .b A nte n n a c o n necto r o n t h e m odem
(F ro m t h e H ard w are M anua l o f G M 28 M odem )
T he a n te n na c o nnecto r ( F ig u re 5 .b ) a llo w s t r a n sm is s io n o f r a d io f re q uen cy ( R F) s ig nals
b etw een t h e m odem a n d a n e x te rn al c u sto m er-s u pp li e d a n te n na. T he m odem i s f it te d w it h a
5 0db F M E m ale c o ax ia l j a ck .

3 .5 . S IM c a rd R ea d er
T he T T4030 ( S E -G M 28) i s f it te d w ith a S IM c a rd r e ad er d esig n ed f o r 3 V a n d 5 V S IM c ard s.
I t is th e flip -u p ty p e, w hic h is lo ck ab le in th e h o riz o nta l p osit io n a n d is a cc ess e d th ro ugh a
r e m ovab le p an el. T he S IM c ard r e a d er i n clu des a S IM p re se n ce s w itc h . T his e n su re s t h at w hen
a S IM c a rd i s i n se rte d o r r e m oved w hil e t h e T T 403 0 ( S E -G M 28) i s t u rn ed O N, i t w ill r e se t.




Fig u re 6 S ketc h es o f S IM c ard r e ad er o n t h e G M 28 m od em .
( F ro m t h e H ard w are M an ua l o f G M 28 M odem )

1 2
3 4



      

  
Em bed ded P ro je ct- E C E 5 101 Pag e 9
4 . M AX 2 3 2 C hip