[time-nuts] Truetime XL-DC help

[Don Wisdom]

Yeah it seems to be my location.   Anyone have any other insight into this?
It locked onto 6 satellites right away at his office.
--Don






On 1/12/08 9:09 PM, "Don Wisdom" <donw at engineeringinc.com> wrote:

> Bruce,
> Im going by my friends calibration lab tomorrow afternoon.   Hes got a known
> working trimble gps setup that he uses for 10mhz.   I will definitly let you
> all know what I find.
> Thanks
> --Don
> 
> 
> 
> 
> On 1/12/08 8:10 PM, "Bruce Lane" <kyrrin at bluefeathertech.com> wrote:
> 
>> Hi, Don,
>> 
>> *********** REPLY SEPARATOR  ***********
>> 
>> On 12-Jan-08 at 19:09 Don Wisdom wrote:
>> 
>>> Bruce,
>>> The Andrew antenna uses a +5v DC Bias The trutime is kicking out +5vDC
>>> between the center conductor & the cable shield.  It has the best horizon
>>> to
>>> horizon view its going to get where I live (mobile home park)   It is
>>> mounted outside on its bracket with the dome above the metal roof.   Any
>>> other suggstions?   I checked the internal battery voltage as well its
>>> normal.   
>> 
>> It is possible that the GPS receiver module itself may have problems. I found
>> that, in the case of a (very!) old receiver module in one of my own clocks (a
>> Magellan OEM5000), cold solder joints can be a problem on some receivers of
>> the late-90's era.
>> 
>> I started with much the same symptoms. What I tried was using an Ungar 6966C
>> heat gun as a makeshift "reflow" tool to carefully reheat and reflow the
>> solder on the surface-mount components (notably the IC's and chip
>> caps/resistors near the antenna port).
>> 
>> The result was amazing. The receiver went from completely deaf to completely
>> normal, and it's been fine ever since. I was particularly pleased about this
>> one because the clock it's in (an Odetics 425) had the Amundsen Antarctic
>> Research Station as its former home, more specifically as part of the AST/RO
>> (Astronomical Sub-Millimeter Telescope/Remote Observatory) project.
>> 
>> Anyway -- If you have a similar heat gun (and if you don't, you should get
>> one
>> -- they're really handy!) just stick the narrow-tube nozzle on it and try
>> going over the GPS receiver board. You have very little to lose.
>> 
>> Happy tweaking.
>> 
>> 
>> -=-=-=-=-=-=-=-=-=-=-=-
>> Bruce Lane, Owner & Head Hardware Heavy,
>> Blue Feather Technologies -- http://www.bluefeathertech.com
>> kyrrin (at) bluefeathertech do/t c=o=m
>> "If Salvador Dali had owned a computer, would it have been equipped with
>> surreal ports?"
>> 
>> 
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> 
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