In message <[EMAIL PROTECTED]>, Hal Murr ay writes: > >[EMAIL PROTECTED] said: >> I can confirm that the choice of 75 Ohm for telecom use indeed is >> because of the low attenuation. The first use of coax was for >> "Carrier Frequency" systems, where a number of telephone conversations >> were AM modulated on individual carriers, usually 4 kHz apart. > >What's the attenuation mechanism?
I have no idea, but I recently read about the introduction of coax in the Danish tele networks and it was said in so many words that 75 Ohms had a significantly longer reach. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
