Try this for a history about the 50 OHM impedance: http://www.rfcafe.com/references/electrical/history-of-50-ohms.htm
On Tue, Feb 7, 2012 at 10:30 PM, Attila Kinali <att...@kinali.ch> wrote: > On Tue, 07 Feb 2012 16:15:44 -0500 > Mike Naruta AA8K <a...@comcast.net> wrote: > > > On 02/07/2012 03:59 PM, Attila Kinali wrote: > > > while TV and radio uses 75R. (there was once a reason > > > for this, but i don't know it). > > > > A 4:1 balun takes old 300 ohm twinlead to 75 ohms. > > Thanks! This explains half it :-) > Do you know why a 4:1 balun was used? > > And do you know why other RF stuff and lab equipment is 50R? > > Attila Kinali > -- > Why does it take years to find the answers to > the questions one should have asked long ago? > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
