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Hi There,
It occured to me the other day that I have been spending many hours sat next to my nanoBTS in a lab environment and have never given thought about the amount of power that the device is outputting. Looking through the bsc_hack config settings I can see the ms max power setting, at present I have this setting set to 15. I am also not sure at which levels to set my nominal power and max_power_red settings.
What are everyone's opinions on a safe power setting at which to set the nanoBTS? Is 15 to high or low? What do other people have there power settings set too? Does anyone have any reading material on the wider health implications of using such a device as the nanoBTS in close proximity to a person for long periods of time?
Many thanks for the help, advice and suggestions.
Matthew
What are everyone's opinions on a safe power setting at which to set the nanoBTS? Is 15 to high or low? What do other people have there power settings set too?
I'm using
max_power_red 12 to put the BTS TX power around 24 - 12 = 12dBm (~16 mW)
ms max power 12 to limit the MS TX power around 16 mW as well.
but it's mostly to avoid catching outside mobile rather than health ...
Does anyone have any reading material on the wider health implications of using such a device as the nanoBTS in close proximity to a person for long periods of time?
Well, the nanoBTS is 200mW max anyway.
I don't know how "close" you are to the BTS but personally, I think I get more radiation from the network card in my laptop that sits on my lap or in front of my face than from the BTS 5 meters away ...
Cheers,
Sylvain
I would set it to the lowest power you need to get the job done. I use max_power_red 20, which for a 1900MHz unit puts the output power at 3dBm (23-20=3). On the TX output of the NanoBTS I inserted 10dB SMA attenuator, so my actual power out is around -7dBm (verified with a Spec An). My configuration works great for desktop testing. I can get a signal up to about 20 feet from the BTS. For the 'ms max power' I use 6, which I believe is the minimum power setting a MS can go to for the higher (1800/1900) bands, with 5 being the minimum for the lower (850/1900 bands). I realize the downlink power is a fair amount lower than the uplink (-7 vs 6) but this keeps unwanted phones from camping on my BTS.
Caleb
-----Original Message----- From: openbsc-bounces@lists.gnumonks.org [mailto:openbsc-bounces@lists.gnumonks.org] On Behalf Of Matthew Harper Sent: Sunday, November 28, 2010 1:36 AM To: openbsc@lists.gnumonks.org Subject: nanoBTS and power settings
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Hi There,
It occured to me the other day that I have been spending many hours sat next to my nanoBTS in a lab environment and have never given thought about the amount of power that the device is outputting. Looking through the bsc_hack config settings I can see the ms max power setting, at present I have this setting set to 15. I am also not sure at which levels to set my nominal power and max_power_red settings.
What are everyone's opinions on a safe power setting at which to set the nanoBTS? Is 15 to high or low? What do other people have there power settings set too? Does anyone have any reading material on the wider health implications of using such a device as the nanoBTS in close proximity to a person for long periods of time?
Many thanks for the help, advice and suggestions.
Matthew
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Caleb Pal -
Matthew Harper -
Sylvain Munaut