[time-nuts] Transmission line question

Alan Melia alan.melia at btinternet.com
Wed Apr 6 20:51:19 UTC 2011


Am I missing something?? Surely it depends on whether the lines are
terminated otherwise by the time time a pulse has travelled to the end and
back they will be a complex impedance and will be frequency dependent ....2
open stubs ?? If terminated then 25 ohms, but why does it matter what a high
impedance device like a PIN "sees" ??

Alan G3NYK

----- Original Message ----- 
From: "Greg Broburg" <semiflex at comcast.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Wednesday, April 06, 2011 8:59 PM
Subject: Re: [time-nuts] Transmission line question


> sounds like an application for a simple power splitter
> on the board.
>
> Greg
>
> On 4/6/2011 12:52 PM, paul swed wrote:
> > Its would be 25 ohms if both lines are 50 ohms and 0 reactence.
> >
> >
> > On Wed, Apr 6, 2011 at 2:07 PM, jmfranke<jmfranke at cox.net>  wrote:
> >
> >> 25 Ohms.
> >>
> >> John WA4WDL
> >>
> >> --------------------------------------------------
> >> From: "Don Otknow"<donald.otknow at gmail.com>
> >> Sent: Wednesday, April 06, 2011 2:00 PM
> >> To:<time-nuts at febo.com>
> >> Subject: [time-nuts] Transmission line question
> >>
> >>
> >>   Hello,
> >>> If I have a pin with two 50 ohm lines leading in opposite directions
from
> >>> its land (let's say they are arbitrarily long so as to truly look like
50
> >>> ohm lines), what is the effective impedance that the pin sees?
> >>>
> >>> Thanks,
> >>> Donald
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