Hi @all,
I have a BG7TBL GPSDO with date from 2017-10-09.
After reading this thread here I also decided for better performance to change the CTS OCXO to a OSCILLOQUARTZ 8663-XS DOCXO and the GPS Module to a NEO-M8T from Mouser.
Regarding the infos I changed the resistor for the antenna voltage from 3.3 to 5 Volts and the multiplicator for the VC for the DOCXO to x2.
The Controlvoltage now is 4.7 Volts. I have to configure a little bit with U-Center to get all Sats (GPS, GLONASS and GALILEO) running. The stability is much better and I can use much more sats
to lock as before. Even a simple Puck antenna near my windows gets 22 Sats quickly.
On the downside of the circuit board the PPS led is blinking and Lady Heather is displaying a lot of data when I use the /rxu switch.
The one problem I see is that the BG7TBL device has its ALM and RUN leds permanently on. There will be a decreasing current after the DOCXO is stable:
(appr. 668 mA at the beginning to appr. 335 mA after nearly 2 minutes).
The pps output is running a normal pps signal and the 10 Mhz are also present.
The serial output at start is:
$GATXT,01,01,02,u-blox AG -
www.u-blox.com*41
08:21:34 $GATXT,01,01,02,HW UBX-M8030 00080000*6F
08:21:34 $GATXT,01,01,02,EXT CORE 3.01 (111141)*36
08:21:34 $GATXT,01,01,02,ROM BASE 2.01 (75331)*16
08:21:34 $GATXT,01,01,02,FWVER=TIM 1.10*5F
08:21:34 $GATXT,01,01,02,PROTVER=22.00*17
08:21:34 $GATXT,01,01,02,MOD=NEO-M8T-0*72
08:21:34 $GATXT,01,01,02,FIS=0xEF4015 (100111)*57
08:21:34 $GATXT,01,01,02,GPS;GLO;GAL;BDS*78
08:21:34 $GATXT,01,01,02,SBAS;IMES;QZSS*46
08:21:34 $GATXT,01,01,02,GNSS OTP=GPS;GLO*38
08:21:34 $GATXT,01,01,02,LLC=FFFFFFFF-FFFFFFED-FFFFFFFF-FFFFFFAE-FFFFFF69*28
08:21:34 $GATXT,01,01,02,ANTSUPERV=*2D
08:21:34 $GATXT,01,01,02,ANTSTATUS=DONTKNOW*22
08:21:34 $GATXT,01,01,02,PF=3F2*30
Do I probably have to modify some further parameters in u-center to get the mcu working right?
There is as I see only UART1 active.
Thanks for helping.
Chris