[amsat-bb] Re: Transit Satellites

Glenn Little WB4UIV glennmaillist at bellsouth.net
Mon Aug 30 21:04:29 PDT 2010

It is my understanding that the transit system is inactive.
This was a Navy navigation system that used the approx 150 MHz and 
400 MHZ signals for determination of location.
I used this system while active duty in the USN submarine service.
I listened to the 149.985 MHz signal at home for many years, but, 
have not heard it for at least 10 years.
The birds were known as OSCAR (for operational) by the Navy.
Here are some links to some information indicating that at least one 
bird was transmitting in 1996.



If you do hear a Transit satellite, and the satellite is operating 
properly, you will hear a data burst, known as a Barker word.
This data burst occurs at every even 2 minute mark.
It can be used as an accurate time hack.
The assumption was that the unit using the system would have time 
that was at least accurate to a minute and this could be used as a time hack.

Hope this helps


At 06:49 PM 8/30/2010, Dave Marthouse wrote:
>With all this talk of the Transit satellites on 149.985MHZ, how are 
>they listed in the keps.  I checked for other satellites of interest 
>on the kelso webpage and found navy navigation satellites.  There 
>are a few named transit.  What Transit birds are we talking 
>about.  I want to see how strong their signals are on my 
>scanner.  Any information would be appreciated.
>Dave Marthouse N2AAM
>dmarthouse at gmail.com
>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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