🚀 go-pugleaf

Daniel Erskine <netsup75@edwardjones.com> wrote in article
<35EACDBE.237D36B8@edwardjones.com>...
> Aaron Blosser wrote:
> > On Fri, 21 Aug 1998 11:07:04 -0500, Daniel Erskine
> > <netsup75@edwardjones.com> said:
> > 
> > >> Using existing 75ohm coax as if
> > >> it was 50ohm coax (with F to BNC adapters) is asking for trouble.
> > 
> > >  I'll inquire with my network staff for more research material, as
> > >I'm curious as to why 75ohm cable would be that much of a problem?!?
> > 
> > I wonder as well.
> > 
> > For short runs of cable, I highly doubt that using 50ohm vs. 75ohm
would
> > make a difference.  That measurement is a measure of the cable's
> > impedance over some distance (1000 ft?), so for a short bit of maybe
> > 50-100 ft, the difference *may* be neglible.

Not so.  A cable's impedance is the ratio of the magnitude of a voltage
wave form
travelling down the cable, to the magnitude of the corresponding current
wave.  Nothing
to do with distance.  But everything to do with reflections at junctions
where there is 
impedance mismatch.  

> > Of course, this all depends on how senstive the receiving equipment is,
> > and I can't make any claims to know how it would really affect the
> > performance.
> > 
> > The reason you *should* use properly rated cable is because with
> > impedance matching you can achieve maximum power output.

Not really.  Maybe you're thinking about amplifier power output, which
peaks into
load, when load impedance is equal to effective internal series resistance
of amp
final stage?  In fact, having impedance matching in a transmission line
does two
things: maximizes strength of received signal at receiver(s), minimizes
signal 
reflected back to source from junctions (which degrades ability to detect
signal.)

> Greetings:
>   Here's another thought!  Is there a 50ohm-to-75ohm converter
> or filter on the market?  If so, is it bi-directional?  Maybe
> buying something like this would cut this news-thread short ;)
> 
> Thanx...
> ------------------------------------------------------
>     THE PRECEDING REFLECTS THE VIEWS OF THE AUTHOR
>    AND NOT, NECESSARILY, THE VIEWS OF EDWARD JONES.
> ------------------------------------------------------
> Daniel W. Erskine            "mailto:erskined@gte.net"
> (314) 515-1406       "mailto:netsup75@edwardjones.com"

With coax so cheap, I'd get the best available cable.
HTH,
John