|
The height may be a factor. That is interesting. I
tested it on the ground. My maximum distance in
an open football field with PCB antenna is
25 meter ( 80 feet ?) that
is similar result to 100 feet. In such a
short distance the PCB antenna is not much helpful outdoor. Anybody
knows the information of an amplifer with an external antenna? Can
I connect a large external antenna like HDTV antenna on the
mote?
-Chang
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
>>
_______________________________________________
>> Tinyos-help
mailing list
>> [email protected]
>> https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
>>
>>
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