[time-nuts] True position unlocking

Thu Apr 11 00:08:36 UTC 2019

..... and as soon as I typed that and sent it in, my GPS unlocked.  Something is very wrong here as I have 3 boards and they all have the same symptom.  More than likely the fault is mine, not the boards.  

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(Mr.) Taka Kamiya
I'm stuck in a wormhole....  Hello, worms! 

    On Wednesday, April 10, 2019, 6:03:55 PM EDT, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:  

 I have somewhat of a result.  

I rigged up an antenna outside.  It has 360 degree view above 30 degrees above horizon.  (it's located at middle of my front yard).
Using 40dB antenna, lock was faster but it still lost sync every now and then.  RE-lock was faster as well.  Then, I disconnected its power supply (which is a switching power supply) and fed it from my lab supply.  The power is spec'd 0.5mv ripple.  It locked about the same as above and lost it once in few minutes.  But once it relocked, it is staying locked.  It's been running 2 hours locked solid.  It would have lost it few times by now.
So the issue likely is the power source.  Yay!

--------------------------------------- 
(Mr.) Taka Kamiya
I'm stuck in a wormhole....  Hello, worms! 

    On Wednesday, April 10, 2019, 11:00:34 AM EDT, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:  

 It is going to take me few days to put up outside antenna.  It is on-and-off rainy in my area this week.  Thanks for the pointer.  I will report back once I have a result.  Thanks again.

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(Mr.) Taka Kamiya
I'm stuck in a wormhole....  Hello, worms! 

    On Wednesday, April 10, 2019, 2:27:42 AM EDT, Mark Goldberg <marklgoldberg at gmail.com> wrote:  

 I am using a Motorola / Pctel 8508851k66 / 3226MSMA that is supposed to be a 26 dB gain antenna with an HP 58515A splitter that provides +3 dB +/- 3 dB. It has a clear view of about 1/2 the sky.
Regards,
Mark

On Tue, Apr 9, 2019 at 11:06 PM Taka Kamiya <tkamiya9 at yahoo.com> wrote:

I have a bullet type 26dB gain antenna in attic.  It goes through hard-line then into Symetricon 4 way splitter, and one of the port is connected to True Position.  My splitter has zero gain per port (ie. each port has exactly the same level as the input)
I have on my plan to install 40dB type and do so outside.  Maybe that's a solution?  I didn't think about this because all other GPDSO locks just fine.

--------------------------------------- 
(Mr.) Taka Kamiya
I'm stuck in a wormhole....  Hello, worms! 

    On Wednesday, April 10, 2019, 1:30:42 AM EDT, Mark Goldberg <marklgoldberg at gmail.com> wrote:  

 What kind of antenna and where is it located? I have a trueposition and it seems to need a higher gain antenna than my other gpsdo, a modern Bodnar. I put it outside with an amplified splitter and it works well.
When using another antenna or this one on the windowsill, it went into holdover fairly often.
Regards,
Mark
On Tue, Apr 9, 2019, 6:00 PM Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:

I have a few Tru-Position boards.  This is an older older GPSDO board for telecom industries.  I am using this with LadyHeather.

All hooked up, it locks and works; but, quite often Lady Heather shows the red line in graph, showing it is unlocked.  I have several GPSDO board here, and for all others, antenna and signal strength are just fine.  Ambient temperatures are "human comfortable".
I am concerned with this frequent unlock.  It happens few times a day and it will eventually RE-locks.
Does anybody know what is happening?

--------------------------------------- 
(Mr.) Taka Kamiya
I'm stuck in a wormhole....  Hello, worms!
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