Re: [Openbts-discuss] How to set RxGain in GPRS branch?

[Gullik W. <gul...@co...>]

Hmm, can you see the MS tx power in chans command?

I had to experiment quite some before i got the phones to adjust down, 
but at
that time I was more ignorant :-)

What happens if you move the phones away? When I was trying to 
understand my problems
I would call the "echo service" from different places. For your case 
that would be a "packet"
connection? Where in the stack does GPRS interface itself?

Gullik
On 06/24/2013 05:10 PM, oxccoxcc oxccoxcc wrote:
> I tried to set GSM.MS.Power.Max to 1 and GSM.MS.Power.Min to 1. But RSSI value is still high (about -25 for WBX, -15 for SBX).
> Tried to change WBX daughterboard to SBX. Receive burst quality is also bad and not all of them can be resolved. It looks like a wavy process.
> At some time bursts have an ideal quality. At another time they are broken. Periodically they are broken partially, for eaxample: (10100...11100110010100--------------...--)
> I also tried to change ARFCN, but it didn`t help. Before i checked this arfcn with uhd_fft.
> One thing, that looks some strange is a timing value=2.00391. This value is constantly at all sessions for PDTCH channel and 2 symbols offset is looks too high for phone, that places near USRP.
>
> 24.06.2013, 17:00, "Gullik Webjörn" <gul...@co...>:
>> Maybe a moot point, but I think it is not a B100 problem if
>> exactness is the issue, but rather a WBX issue.
>>
>> The same thing should happen on another USRP equipped with WBX,
>> if RxGain is left at +47 dB.
>>
>> Regards,
>>
>> Gullik
>>
>> On 06/24/2013 12:59 PM, oxccoxcc oxccoxcc wrote:
>>
>>>   According to USRP B100 RxGain problem, i set GSM.Radio.RxGain to 7dB. After that not RACH bursts have an RSSI value about -80 - -87 and normal quality.
>>>   But when i starting GPRS and connect to web page, receive bursts RSSI grow to -10 - -15. And, because of that, receive bursts have a bad quality and most of them can`t be resolved.
>>>
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