How do you know it is not 75 ohms at DC? How long do you think it will take for the DC signal to reach the other end of the coax if it is applied at one end? Will it be at the speed of light?
73 Gary K4FMX > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Ron Wright > Sent: Saturday, September 01, 2007 8:02 PM > To: [email protected] > Subject: Re: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: > Duplexers > > Jeff, > > The question is way off base. No one said one cannot carry DC or any > other signal on coax. The question was what was the impedance of a coax > at given frequencies. > > At DC I can guarantee you RG59 is not 75 Ohms unless you got enough to get > enough R and this is totally another discussion. I would think you would > agree one will not see RG59 being 75 Ohm at DC. The same can be said at 1 > Hz or 2 Hz or 5 Hz...etc. There is a point at which it starts to > propergate and does look like 75 Ohms. I think you might understand this. > > 73, ron, n9ee/r > > > > > >From: Jeff DePolo <[EMAIL PROTECTED]> > >Date: 2007/09/01 Sat PM 01:18:35 CDT > >To: [email protected] > >Subject: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers > > > > >> I don't know where the confusion is...all coax and feedline > >> has a upper and lower freq limit. Might try to learn > >> something about this. > > > >If what you say is true, can you tell me, using sound engineering and > math, > >why you can carry DC on coax if it has a low-frequency cutoff? > > > > --- Jeff > > > > > > > Ron Wright, N9EE > 727-376-6575 > MICRO COMPUTER CONCEPTS > Owner 146.64 repeater Tampa Bay, FL > No tone, all are welcome. > > > > > > > > Yahoo! Groups Links > > >
