[time-nuts] Re: Trimble GSPDO - ISSUE

[ordnit]

Hi there,
thank you for all the information.

I'm using a bullet antenna (don't remember the maker), on top of my 
office. Cable has 50ohm impedance (ultraflex 7) and average quality N 
connectors. Patch from splitter to receiver is 50ohm as well, but still 
using RG58, will upgrade it asap.

Update on my issue:
Yesterday I made some testing, removing the splitter and nothing changed 
(apart the samsung complaining about signal loss :)  ).

I removed the trimble board from its case, I gave a look to it and 
powered up again: well... may be a kind of magic but it works. Now the 
status led is blinking fast and this is the output I get from commands:

UCCM >STATus

                - UCCM Slot STATE-

1-1. #Now ACTIVE STATUS ---------------- [Master Manual]
1-2. #Before ACTIVE STATUS ------------- [OCXO Warm]
2-1. #Reference Clock Operation -------- [Not Used]
2-2. #Current Reference Type ----------- [GPS]
2-3. #Current Select Reference --------- [GPS 1PPS]
2-4. #Current Reference Status --------- [Good Accuracy & Stable]
      #GPS STATUS ----------------------- [Available]
      #Priority Level ------------------- [LINK > GPS]
      #ALARM STATUS
      #H/W FAIL [ LINK ]
      #OPERATION ALARM ------------------ [Antenna]
3-1. #PLL STATUS ----------------------- [ENABLE]
3-2. #Current PLL MODE ----------------- [OFFSET OBSERVATION MODE]

UCCM >SYSTem:STATus?

-------------------------------------------------------------------------------
57964-15     serial number  86854165     firmware ver  3.0.0.11-01LINK 
   mode
-------------------------------------------------------------------------------
Reference Status __________________________   Reference Outputs 
_______________
XX Ref 8KHz 0: [LOS]
XX Ref 8KHz 1: [LOS]                          TFOM     3            FFOM 
      1
XX Ref 8KHz 2: [LOS]                          UCCM A Status[ACTIVE]
XX Ref 8KHz 3: [LOS]
 >> GPS: [phase:-4.8E-06, settling]
ACQUISITION ...................................................[GPS 1PPS 
Valid]
Tracking: 10 ___   Not Tracking: 0 ________   Time 
____________________________
PRN  El  Az  C/N   PRN  El  Az                GPS      07:35:47     29 
Jul 2021
  26  73 268   45
  31  22 215   37                              ANT DLY  0 ns
  16  45 309   42                              Position 
________________________
  10  11 170   38                              MODE     Hold
  29  32  77   43
  25   6 141   34                              LAT      N  43:35:11.808
  18  79  73   45                              LON      E  13:31:1.216
   5  18  45   39                              HGT              +228.84 
m (MSL)
  23  31 143   42
  27  19 281   40

UCCM >posstatus

---------------------------------------------
  07/29/2021  07:36:06
---------------------------------------------
  Position: LAT(N  43:35:11.808) LON(E  13:31:1.216) H( +228.84 m MSL)
---------------------------------------------
  Geometry: PDOP(0.0) HDOP(0.0) VDOP(0.0)
  num of visible sats >  10
  num of sats tracked >  10
   -------- Receiver Channel State --------
  CH  0 > SateID(26) TrackMode(pos avail) SigValue(46)
  CH  1 > SateID(31) TrackMode(pos avail) SigValue(36)
  CH  2 > SateID(16) TrackMode(pos avail) SigValue(42)
  CH  3 > SateID(10) TrackMode(pos avail) SigValue(37)
  CH  4 > SateID(29) TrackMode(pos avail) SigValue(42)
  CH  5 > SateID(25) TrackMode(pos avail) SigValue(36)
  CH  6 > SateID(18) TrackMode(pos avail) SigValue(45)
  CH  7 > SateID(05) TrackMode(pos avail) SigValue(40)
  CH  8 > SateID(23) TrackMode(pos avail) SigValue(43)
  CH  9 > SateID(27) TrackMode(pos avail) SigValue(38)
  CH  10 > SateID(00) TrackMode(tracking ) SigValue( 0)
  CH  11 > SateID(00) TrackMode(tracking ) SigValue( 0)
---------------------------------------------
  Rcvr Status(1):
---------------------------------------------
  Antenna Voltage:  5000.00mV   , Antenna Current:     0.00mA


UCCM >DIAGnostic:LOG:READ:ALL?

Log status:  22 entries

L00:21/07/28.06:00:47 Self survey started
L01:21/07/28.06:05:30 Ref Change: GPS
L02:21/07/28.06:09:10 Ref Change: No reference
L03:21/07/28.06:09:25 Ref Change: GPS
L04:21/07/28.06:09:54 Ref Change: No reference
L05:21/07/28.06:10:07 Ref Change: GPS
L06:21/07/28.06:32:45 Ref Change: No reference
L07:21/07/28.06:33:07 Ref Change: GPS
L08:21/07/28.06:34:42 Self survey completed
L09:21/07/28.06:36:13 Ref Change: No reference
L10:21/07/28.06:36:25 Ref Change: GPS
L11:21/07/28.06:58:13 Ref Change: No reference
L12:21/07/28.06:58:25 Ref Change: GPS
L13:21/07/28.07:07:27 Ref Change: No reference
L14:21/07/28.07:07:43 Ref Change: GPS
L15:21/07/28.07:31:43 Ref Change: No reference
L16:21/07/28.07:31:55 Ref Change: GPS
L17:21/07/28.08:35:59 GPS Antenna open
L18:21/07/28.08:36:01 Ref Change: No reference
L19:21/07/28.08:36:30 Ref Change: GPS
L20:21/07/28.12:13:02 Output mode: Active
L21:21/07/28.12:13:02 A/S change: Slave(HIGH)


So far, so good.

PS: I don't belive in magic, so I guess that some glue I used to hold 
the board, added some capacitive side effects. Let's keep it going, 
wating for a new GPSDO to join the collection.


Best regards!