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Motion sensor

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KevinW

Member
Is this the antenna at the upper right and can something be added to it to increase the range
slightly ?
sensor.JPG
 

alec_t

Well-Known Member
Most Helpful Member
That looks like a printed bottom-loaded antenna. I'm no expert, but I think a full-length 1/2-wave vertical dipole antenna might improve things if you want an omni-directional response, or a Yagi array if you want a directional response.
 

KevinW

Member
Thanks Alec.
That would be more than I require so I'll try relocating the base unit.
I was hoping I could add a small coil or something similar just to make it a tad more effective.
 

alec_t

Well-Known Member
Most Helpful Member
I was hoping I could add a small coil or something
The existing antenna should have been dimensioned and loaded for optimum response already: adding anything would then de-tune it.
 

dr pepper

Well-Known Member
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This is an arduino where I did something like this, this is a wifi device, so I was fortunate in that there is plenty of antenna's around for wifi frequencies, I just pinched one off an old router that already had a connector on the end.
I pulled the ant off the board and soldered on a socket, range is now 3x.
If your device is wifi you can do this, or you could build your own ant, but it can get tricky.
IMG0036B.jpg
 

KevinW

Member
That got me searching for 315MHz antenna's and they are available but did you disable the original antenna or add the new antenna to it?
 

dr pepper

Well-Known Member
Most Helpful Member
I disconnected the built in ant, you have to do that.
 

dr pepper

Well-Known Member
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I wonder how that works, surely iy cannot rx and tx at the same time, must have a memory or something.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
I would imagine it's intended for simple garage door remotes, so simply receives the small data packet and then retransmits it - it's probably fairly dependent on what's been transmitted.
 
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