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Sim900A Aerial

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Wp100

Well-Known Member
Hi,

Am using a Sim900A module ( firmware reprogrammed for uk use) with its 40mm rubber covered screw on aerial.

If I enclose it within an abs box will it degrade its performance much ? ( urban use)

Also will the aerials position, vertical or horizontal affect it ?

From simple bench tests I have done, not been able to prove anything for sure.

Thanks.
 

dr pepper

Well-Known Member
Most Helpful Member
Yes possibly, a simple test you can do is put the box in a microwave with a cup of water for a few seconds, if the box warms up its conductive and unsuitable, I believe some abs contains metals.

The polarisation of the aerial needs to be the same as the transmitter, this is less critical at uhf, and I assume the 900 means 900mhz.
 

Wp100

Well-Known Member
Not sure which frequency is being used, seems the Sim900 uses 2G, so at could be 900mhz or 1800 mhz with a Tesco Sim.

Just tried the microwave test, full power for 30 seconds, the water near boiling , the case cold.

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000412.jpg
 

dr pepper

Well-Known Member
Most Helpful Member
If the magnetron in your microwave blasting it with 2.4 gig doesnt warm it up then its probably fine for your application.
 
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