[time-nuts] Why a 10MHz sinewave output
azelio.boriani at screen.it
Tue Feb 7 21:43:01 UTC 2012
Try this for a history about the 50 OHM impedance:
On Tue, Feb 7, 2012 at 10:30 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Tue, 07 Feb 2012 16:15:44 -0500
> Mike Naruta AA8K <aa8k at 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?
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