[time-nuts] Re: looking for MITREX modem manual/documentation

[Lester Veenstra]

I cannot find the specifics in any of my old papers, that I have found, but
this gives a good hint.

 



 

The other suggestion that echoes is truncated GPS codes.

 

However the real answer remains:

-  - - - - 

Hi, JeanMichel,

 

you might ask Wolfgang Schäfer at timetech.de phone number from web site.

 

cheers,

Gerhard

-  - - - - - 

 

Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y

lester at veenstras.com

 

452 Stable Ln (HC84 RFD USPS Mail)

Keyser WV 26726

 

GPS: 39.336826 N  78.982287 W (Google)

GPS: 39.33682 N  78.9823741 W (GPSDO)

 

 

Telephones:

Home:                     +1-304-289-6057

US cell                    +1-304-790-9192 

Jamaica cell:           +1-876-456-8898 

 

 

 

-----Original Message-----
From: jeanmichel.friedt at femto-st.fr [mailto:jeanmichel.friedt at femto-st.fr] 
Sent: Friday, March 25, 2022 8:56 AM
To: time-nuts at lists.febo.com
Subject: [time-nuts] looking for MITREX modem manual/documentation

 

Dear community,

I am trying to find historical documents describing the pseudo random
sequences used

in the SATRE Two-Way Satellite Time and Frequency Transfer (TWSTFT) modem.

K. Imamura & F. Takahashi (Two Way Time Transfer Via a Geostationnary
Satellite, 

J. of the Comm. Research Lab., 39(1), March 1992) describe the code
structure

(14-bit long pseudo random sequence truncated to 10000 bit length) but the 

generator polynomial coefficients are not given. I have not been able to
find this

information in Timetech's SATRE manual nor in the publicly available
literature.

This paper cites "P. Hartl, A modem for microwave time and ranging
experiments

via telecommunication satellites, MITREX2500 Manual, Jan 1989" which I am
unable

to locate.

Would anyone have such a document, or at least could tell me whether the
generator

polynomials are described there? Alternatively, does anyone have a
description of these

14-bit polynomial generators?

 

Thanks, Jean-Michel

 

--

JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon,
France

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