I have bad cell signal inside the house but reasonable outside. My phone is a sony smartphone that does not have an external antenna socket.
After a whole bunch of experimentation I found, using different kit (a mobile broadband router that does have external antenna connector), that an external antenna on the outside wall of the house does work to improve the performance.
I'd like to do the same with my phone, put say a collinear antenna outside and feed a bit of coax through the wall to it.
But, how to connect this antenna to the phone?
First thought was to try some kind of passive inductive type strap-on / cradle affair. But, having cannibalised one from an old thb bury in-car cradle, it doesn't seem to make the slightest jot of difference.
I looked at the commercially available 'direct connect' amplifiers to go between the external antenna and the inductive coupler. Only thing is there seems to be a lot of advice that these are not just theoretically illegal, they actually can and do cause interference problems for neighbours etc.
They all seem to be designed to cover a large area, measured in the hundreds or thousands of square feet.
What I'm thinking is, if all I am trying to do is boost the signal to one phone which is in a permanent fixed position in it's inductive cradle, could I get away with a repeater amp that put out a much, much lower output than the off-the-shelf units? sufficient only to excite a very closely positioned phone's internal antenna?
I'm thinking of a very minimal circuit consisting of perhaps just one or two transistors and a small handful of passive components plus a power supply (not actually sure where I'd start with the design though).
Is this a practical goer, or should I ditch the idea? The phone is apparrently working in the 2100MHz area.
What's actually inside these passive inductive couplers?
After a whole bunch of experimentation I found, using different kit (a mobile broadband router that does have external antenna connector), that an external antenna on the outside wall of the house does work to improve the performance.
I'd like to do the same with my phone, put say a collinear antenna outside and feed a bit of coax through the wall to it.
But, how to connect this antenna to the phone?
First thought was to try some kind of passive inductive type strap-on / cradle affair. But, having cannibalised one from an old thb bury in-car cradle, it doesn't seem to make the slightest jot of difference.
I looked at the commercially available 'direct connect' amplifiers to go between the external antenna and the inductive coupler. Only thing is there seems to be a lot of advice that these are not just theoretically illegal, they actually can and do cause interference problems for neighbours etc.
They all seem to be designed to cover a large area, measured in the hundreds or thousands of square feet.
What I'm thinking is, if all I am trying to do is boost the signal to one phone which is in a permanent fixed position in it's inductive cradle, could I get away with a repeater amp that put out a much, much lower output than the off-the-shelf units? sufficient only to excite a very closely positioned phone's internal antenna?
I'm thinking of a very minimal circuit consisting of perhaps just one or two transistors and a small handful of passive components plus a power supply (not actually sure where I'd start with the design though).
Is this a practical goer, or should I ditch the idea? The phone is apparrently working in the 2100MHz area.
What's actually inside these passive inductive couplers?