Re: [Openbts-discuss] OpenBTS and GSM 850

[David A. B. <dbu...@jc...>]

The 2.6 release ramps up power slowly, starting at  
GSM.PowerManager.MaxAtnDB and ramping up to  
GSM.PowerManager.MinAttenDB at a rate of 1 dB every  
GSM.PowerManager.Period milliseconds. All of these values are  
configurable.

In the default configuration, with your hardware, power will start at  
-10 dBm and ramp up to 13 dBm at a rate of 1 dB every 6 seconds.

You can observe and control this in real time from the CLI with the  
"power" command.

If you try to push the output power above 3 dB attenuation with the  
USRP/RFX hardware, you will produce a distorted waveform.  One  
symptom of this is that phones will see images of your BTS signal on  
other ARFCNs, like when your 900 MHz phone showed a beacon on ARFCN  
10 while you were transmitting on ARFCN 207.


On Oct 4, 2010, at 9:20 AM, Adam wrote:

> You were right.
> 6300 supports either 850 either 900.
> I used another phone and it works with 2.5.4 Lacassine
> thank you very much  for help
>
> I have sitll however problem with 2.6.0 Mamou
> on the same equipment network signal is very weak
>
> I was not able to register on the 850 with phone with which I  
> registered successfully on Lacassine
> and on both networks I should wait ~3-5 min before network signal  
> appear (on Lacassine i see it instantly)
>
>


David A. Burgess
Kestrel Signal Processing, Inc.