[Antennas] ladder line questions

Mon, 17 Nov 2003 03:53:47 -0500

George,   Thanks...  yup, two 50 ohm coax cables do form a 100 ohm balenced
feedline, of sorts.  But also form a 25 ohm impedance load to the
transmitter.This can be handled with most mfj tuners, if you hook them up
backwards. But still a bad idea...  Granted there are a lot of ways to solve
a problem, but only one best way.  .. and this isnt it.
  Usually  I agree with you, but this is an exception.
KZ5V
----- Original Message ----- 
From: "George, W5YR" <[email protected]>
To: "Hue Miller" <[email protected]>; <[email protected]>
Sent: Sunday, November 16, 2003 8:06 PM
Subject: Re: [Antennas] ladder line questions


> Two 50-ohm coaxes form a shielded 100-ohm balanced line.
>
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
> "Starting the 58th year and it just keeps getting better!"
> [email protected]
>
>
>
>
>
> ----- Original Message ----- 
> From: "Hue Miller" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, November 16, 2003 4:43 PM
> Subject: Re: [Antennas] ladder line questions
>
>
> >
> > ----- Original Message ----- 
> > From: "HSHK" <[email protected]>
> >
> > "....Besides using a 4:1 balun and then running coax, you can
> > do away with the balun and use balanced coax.
> >
> > If you'd like to make some ladder line, the attached pics will
> > show...
> >  Bill KA8VIT"
> >
> > Bill, attachments don't make it thru the list reflector.  Are the
> > photos up somewhere else where i could have a look?
> >
> > Also- is this correct: the 2 coaxes run this way, as a balanced
> > coax, 4x the impedance of the single coax?
> >
> > And if so- let's say we do this, raising the impedance, let's say
> > we then want to retain the balanced coax idea ( more for noise
> > suppression and ground independence ) but want to have the
> > line impedance the same as for a single coax span. How many
> > "balanced coax" pairs do we need in parallel? 2 or 4? Just
> > curious.
> > Tnx, Hue Miller
> >
> > - - -
> >
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
> > _______________________________________________
> > Antennas mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/antennas
> - - -
>
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas
>