: Re: RE: [Repeater-Builder] Re:
Duplexers
Ron , Aw c'mon Ron, dig out those equations from your library so we can all
see where you're comming from. That way we can get an idea how much reference
materials you really have and who and what they are. And just because your
name is Wright doen't
The equation is for characteristic impedance which means a line of infinite
length or one that is terminated with a resistive load equalling the
impedance of the transmission line. An interesting note, twisted pair telco
lines are about 600 ohms at baseband levels but are 120 ohms at DSL
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/02 Sun PM 09:07:18 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Isnât it interesting to note thatthe impedance goes UP at low frequencies
: RE: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
I was wondering when someone was going to dredge that up from the Beldon
papers. Good going Jesse.
But that still doesn't mean or show that coax cable has a low frequency
cutoff or that it stops looking
: [Repeater-Builder] Re: Duplexers
But it is your statement.
73
Gary K4FMX
-Original Message-
From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Sunday, September 02, 2007 6:46 AM
To: Repeater-Builder@yahoogroups.com
One can see there becomes a point where the coax will not
look like coax at low frequencies or atleast have a
characteristic impedance of something other than it normal value.
Most of this is true (although I don't know what you mean by coax will not
look like coax), and I already
Hahaha a audiophiles... can sell them anything no need for real
physics, just tell them that this device will make things sound better, back
it up with a BS statment that doesn't apply, and charge them 100 bux.
On 9/3/07, Jeff DePolo [EMAIL PROTECTED] wrote:
One can see there
not expect it, hi.
73, ron, n9ee/r
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/02 Sun PM 08:29:08 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
But it is your statement.
73
Gary K4FMX
-Original Message-
From
PROTECTED] gaschafer%40comcast.net
Date: 2007/09/02 Sun PM 08:29:08 CDT
To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
But it is your statement.
73
Gary K4FMX
-Original Message
, but then again
I really did not expect it, hi.
73, ron, n9ee/r
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/02 Sun PM 08:29:08 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
But it is your statement.
73
Gary K4FMX
, September 02, 2007 6:46 AM
To: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Gary,
I don't know. Why don't you tell us.
I don't know why gravity will pull me to the ground real
To: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
But it is your statement.
73
Gary K4FMX
-Original Message-
From:
Repeater-Builder
of pictures.
I hope you enjoyed this as much as I.
73, ron, n9ee/r
From: allan crites [EMAIL PROTECTED]
Date: 2007/09/03 Mon PM 04:09:58 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Ron , Aw
.
- Original Message -
From: Gary Schafer
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, September 01, 2007 6:58 PM
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
How do you know it is not 75 ohms at DC?
How long do you think it will take
Gary,
Now I know you are kidding, hi.
73, ron, n9ee/r
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/01 Sat PM 08:58:13 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
How do you know it is not 75
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/01 Sat PM 08:48:03 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
Ron,
Maybe you could tell us why coax cable has a lower frequency limit? You
claim that it does
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.
You said coax has a low-frequency cutoff. I'm asking about that
specifically. I didn't ask about about impedance.
At DC I
-Builder] Re: Duplexers
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.
You said coax has a low-frequency cutoff. I'm asking about that
specifically. I didn't
Impedance refers to both R and X, resistance and reactance. Impedance
affects all current flow, DC and AC. X affects AC only.
Impedance is specific to AC. There's no such thing as impedance at DC, only
resistance. Look up in the definition of impedance in any engineering text
and you'll find
, ron, n9ee/r
From: Jeff DePolo [EMAIL PROTECTED]
Date: 2007/09/02 Sun AM 09:01:03 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
The question is way off base. No one said one cannot carry
DC or any other
PM 12:38:28 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Ok. Coax doesn't have an impedance at DC it has a resistance.
Coax impedance is found by:
Zo = sqrt [ (R +j 2 pi f L ) / (G + j 2 pi f
differences in coax. Maybe not.
Oh well. Good discussion.
73, ron, n9ee/r
From: Jeff DePolo [EMAIL PROTECTED]
Date: 2007/09/02 Sun PM 12:12:51 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Impedance
: 2007/09/02 Sun PM 12:12:51 CDT
To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Impedance refers to both R and X, resistance and reactance. Impedance
affects all current flow, DC and AC
: [Repeater-Builder] Re:
Duplexers
Gary,
I don't know. Why don't you tell us.
I don't know why gravity will pull me to the ground real fast if I jump
off a bridge, but I have all the faith in the world it will. Einstin
tried to explain it, but died before he got the results.
Taking
: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Gary,
Now I know you are kidding, hi.
73, ron, n9ee/r
From: Gary Schafer [EMAIL PROTECTED]
Date: 2007/09/01 Sat PM 08:58:13 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: RE: RE: RE: RE: RE: Re: Re: RE
: RE: [Repeater-Builder] Re:
Duplexers
Ok. Coax doesn't have an impedance at DC it has a resistance.
Coax impedance is found by:
Zo = sqrt [ (R +j 2 pi f L ) / (G + j 2 pi f c) ]
where:
f is frequency
L is inductance
C is capacitance
R is the resistance
G is shunt conductance
Of Jeff Condit
Sent: Saturday, September 01, 2007 10:24 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
Hi all! If a piece of coax is sitting at ground and you suddenly attach a
battery (DC) across it, you're really talking
.
73
Gary K4FMX
_
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse Lloyd
Sent: Sunday, September 02, 2007 4:10 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re:
Duplexers
So
Correction to below: Change the word frequency to wavelength. It should
read;
There is no high frequency cutoff but as the spacing of the center
conductor and shield gets larger compared to WAVELENGTH a point is reached
where the propagation mode of the cable changes and other modes come into
Gary,
Yes the HP meter was spec'd to go below below 0.5 MHz, it went down to 100 kHz.
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.
I know about low freq RF. Worked on a Navy program that used 18 kHz, a
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?
PROTECTED]
Date: 2007/09/01 Sat PM 01:18:35 CDT
To: Repeater-Builder@yahoogroups.com
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
[mailto:Repeater-
[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Saturday, September 01, 2007 8:49 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: RE: RE: RE: RE: Re: Re: RE: [Repeater-Builder] Re: Duplexers
Gary,
Yes the HP meter was spec'd to go below below 0.5 MHz, it went down to 100
kHz
-
[EMAIL PROTECTED] On Behalf Of Ron Wright
Sent: Saturday, September 01, 2007 8:02 PM
To: Repeater-Builder@yahoogroups.com
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
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