Hi，
 
For question 1:
Please following the links http://wush.net/trac/rangepublic/wiki/BuildInstallRun. I do with it step by step, it's OK.
 
For question 2:
UmTRX has two channels, so the PCB has TX1 RX1 TX2 RX2 interface. TX1/RX1 for channel1. TX2/RX2 for channel2. So there are 4 cables. 
GPS antenna is for clock calibrating.
 
Calibrate with GPS:
 1. Take your UmTRX outside to get GPS lock.
 2. When GPS acquires a lock, use 'umtrx_vcxo.py' utility without
parameters to read current VCTCXO DAC value in a loop.
 3. When the value stabilise (couple minutes after GPS acquires the
lock), write this value to EEPROM:
      ./usrp_burn_mb_eeprom --key tcxo-dac --val <YOUR_VAL>
 4. Now i should pickup the value from EEPROM on boot, so GPS is no
required unless you change ambient temperature considerably.
 
Note, that you should warm up your UmTRX for a while before
calibration, because it depends on the TCXO temperature.
 
jiangwy
 
From: Manoel Aposaz
Date: 2013-09-12 04:55
To: umtrx
Subject: how can i scan the frequencies in an area with GNU radio and Umtrx

Hi all,

If, someone is reading this, please i need help:

1- I want to know if there is a manual showing how to put all the part of the package of Umtrx togheter.

2- If i want to scan the frequencies in an area, what can i install to let GNU radio communicate with  Umtrx to show the frequency graph that will help me choose the non used frequencies (it is possible with USRP and i want to know how to do it with Umtrx).

3- My last question is to know if handover is possible with just OpenBTS 2.8 and Umtrx modules or it required an OpenBSC and OsmoBTS architecture.

Best regards:

Manoel.