How high off the ground do you have the motes? To get good transmission distances I would recommend to you that you place them at least 1 yard off the ground, 2 yards is even better. I have done range testing with the standard antenna and some external antennas in an open hay field. We had similar results to what you are getting when they are on the ground.
Matt
[EMAIL PROTECTED] wrote: -----To: Chang Li <[EMAIL PROTECTED]>
From: Matt Thompson <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
Date: 07/24/2006 05:26PM
cc: [email protected]
Subject: Re: [Tinyos-help] Antenna gain on tmote
I have only had a max distance of 100 feet outdoor line of sight :(
-Matt
Chang Li wrote:
> What is the maximum distance between two motes who can communicate
> outside by your chip antenna?
>
>> Hi,
>>
>> Does anyone know the dBi gain of the PCB antenna on the tmote sky
>> modules?? We have layed out a board with fractus 1dBi gain antennas,
>> and we're not getting close to the range of the tmote antennas.
>> Trying to figure out if this is due to lack of gain, or other
>> design/manufacturing issues (unmatched impedance).
>>
>> Cheers,
>> Matt
>> _______________________________________________
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>> [email protected]
>> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>>
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