[FOSS-GPS] RTKLib rover - base question

[Aljaž Osterman]

Dear all, 

I've just joined the mailing list. I'm not sure if this list accepts
messages only from subscribers so perhaps you'll get it twice (the
content is very similar).
Instead of just introducing myself there's also 'a not so short'
presentation of a problem I have with RTKLib.

I've started working on an agricultural project involving precise GPS
positioning. My previous use of GPS devices was limited to simple flight
recording and car navigation. 

For our project we're using 2 ublox6 devices and RTKLib running on
Windows. One receiver acts as a rover and another as a base. Each is
connected to PC. Between PCs there's wireless connection. 
The problem I have is that from base data no location is calculated. 

What works:
1- both receivers work independently (each on its own PC) with ucenter
(software from ublox)
2- both receivers work independently with RTKnavi if input stream is set
to rover
3- rover works over wireless (navi+strsvr)

To check where's the real problem I went on with only 1 receiver and 1
PC. In Navi I tried once to set input stream as rover (position
calculated ok, plotted) and next to set as base station. This time,
position is not calculated. In Navi, 2nd square is light green (as
before 1st with rover), but the middle one (the only one) never switches
from dark green to light green. However, satellites are found and
strength of signals is plotted (and changes with time so it works
somehow) BUT they are all grey and never turn to color mode.

I've found almost identical (and recent) thread but there was no
solution or at least not described:
http://lists.osgeo.org/pipermail/foss-gps/2012-May/000688.html

>From the RTKLib manual I don't know if this behavior of RTKLib is by
design or base/rover input streams can be both used in case of position
calculation from a single receiver signal. 
Anyway, I still need to obtain the position from the base ...

As proposed in other posts I've already set in u-center 
View-Messages view: UBX-CFG-PRT to Target=USB, P_IN=UBX+NMEA+RTCM,
P_OUT=RAW
and 
Configuration View - MSG: RXM-RAW, RXM-SFRB -> USB 1

Thank you for reading so  far. I'll record the outputs tomorrow so
there's more to come :) 

I'd appreciate your comments and advices.   

Best regards,
Aljaz