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Better signals for handy GSM 1800, please comment.

Better signals for handy GSM 1800, please comment.

Better signals for handy GSM 1800, please comment.

Dear Friends,
First, sorry for my English, this is my first post and I have only a little knowhow/experience abt RF transmission.
Second, I have problem with handy signal inside my house is very weak sometimes no  signal at all, while outside I've got better (2-3 points of 5 full bar).
I have plan to try an Outdoor antenna unit using own made Dish reflector (D=800 mm, d=100 mm,f=400 mm) feed with 1850 MHz Helix, with coax cable 75 ohm transmitted to  Indoor simple Helix antenna .
My objective is to improve better receiving signals inside my house with this idea , but I'm not so sure

Friends, please comment WILL IT WORK ??

Thank You,

young dad

RE: Better signals for handy GSM 1800, please comment.

Thanks to all,
Actually I have just finished the trial and it works great !
Dish dimension : D = 870 mm, d =130 mm, f = 363.9 mm so f/D = 0.42
Feed : Helix w/ d = 2", 4 turns 1.2 mm copper wire with copper foil imp matching.
Coax cable : RG58 Belden 9907 12 meters length, with BNC connector
Indoor aerial : copper wire 1.2 mm 1/2 wl + 3 turns d 13 mm + 1/4 wl, placed as close as possible to handset.

The result : I've got 4 bars GSM1800 signals with good stability inside my house.

The weakness : the indoor aerial should really close to the handset otherwise the signal will dropped dramatically.

Please inform : any links that I can learn how to make a simple and easy to build a 1850 MHz preamplifier + 1 or 2 W amplifiers ? so I can phone freely without bringing cables everywhere inside the house ?

Best regards,

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