[time-nuts] GPS antenna in silicon/RTV encapsulation

EWKehren at aol.com EWKehren at aol.com
Tue Apr 15 14:02:12 EDT 2014


The Gerber Baby Food Jar at Wall Mart $ 0.49 
 
 
In a message dated 4/15/2014 1:03:40 P.M. Eastern Daylight Time,  
jimlux at earthlink.net writes:

On  4/15/14, 8:13 AM, EWKehren at aol.com wrote:
> Working off list on a super  high performance GPSDO but low cost thanks 
to a
>   time nut  (sorry forgot his name) he directed me to DX.com which have 
ublox
>  with  antenna for lwss than $ 23. Super performance and though they are  
out
> of the one  with 1 pps all you have to do is solder directly  to the 
module.
> Have both  versions. Attached you see what I did  with the antenna but 
found
> out the hard  way that when it rains  the concave bottom fills with water,
> still works but not  as  good. So last night I made it flat with 3M Marine
> 5200 slow cure that  I have  extensive experience with from boating. Will 
take a
> full  week to cure but if it  does not work I can always remove it and  
start
> over
>

There is a similar approach using a small  "display dome" which is 
basically a round bottom beaker kind of shape  designed to go on a wooden 
base. It can just as easily go on a big cork or  stopper, or a disk cut 
out of a HDPE cutting board.


Googling  "display dome" will show you copious choices. or somewhere like  
"glassdomes.com"

Of course, if you have a supply of canning jars or  babyfood jars, then 
you can use those. Nothing says the jar has to be  mounted with the axis 
vertical. You could do it sideways (like a ship in a  bottle) to help 
solve the "rain in the punt"  problem.


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