Open ladder line question
 

In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

I hope I am making myself clear on this.

Thanks

Steve W4SEF

Yes and Yes.

"S.Fritts" wrote in message
...

In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

I hope I am making myself clear on this.

Thanks

Steve W4SEF

Hi Fritts:

Yes you can do that, why not? I would try and keep the coax run as short as
possible because with a center feed zepp on most frequencies the SWR on the
coax will be very high and the extra loss from the high SWR will eat up some
of you power.


--
John Passaneau
State College Pa.



"S.Fritts" wrote in message
...

In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

I hope I am making myself clear on this.

Thanks

Steve W4SEF

S.Fritts wrote:
In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

Why do you think you need a 4:1 balun?
--
73, Cecil http://www.qsl.net/w5dxp


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Because you cant run 50 ohm output to a 450 ohm impedeance...........

thanks to all who answered


Steve



On Fri, 05 Aug 2005 20:34:23 -0500, Cecil Moore
wrote:

S.Fritts wrote:
In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

Why do you think you need a 4:1 balun?

Thanks to all who answered.

Steve
W4SEF

On Fri, 05 Aug 2005 22:03:32 GMT, S.Fritts wrote:


In reference to the discussion about the fellow wanting to run several
antennas with seperate ladder lines, is it ok to terminate the ladder
line with a 4:1 balun and the run the coax from the balun to the
tuner? I also want to run at least two center fed zepp type antennas
fed with ladder line. Can I just terminate the ladder lines outside
with a 4:1 balun on each and run two coax feed lines to an antenna
switch inside the house?

I hope I am making myself clear on this.

Thanks

Steve W4SEF

S.Fritts wrote:
Because you cant run 50 ohm output to a 450 ohm impedeance...........

I guess I asked the wrong question. Why do you think you
are dealing with a 450 ohm impedance? It's impossible to
encounter a 450 ohm impedance on a Z0=450 ohm transmission
line with reflections and one doesn't often encounter an
antenna with a 450 ohm feedpoint impedance.

Cecil Moore wrote:
Why do you think you need a 4:1 balun?
--
73, Cecil http://www.qsl.net/w5dxp


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Sure you can, I do it every time I get on the air.

"S.Fritts" wrote in message
...



Because you cant run 50 ohm output to a 450 ohm impedeance...........

thanks to all who answered


Steve

On Mon, 08 Aug 2005 02:47:27 GMT, S.Fritts wrote:




Because you cant run 50 ohm output to a 450 ohm impedeance...........


The chances of your balun seeing a 450-ohm impedance in the
configuration you are planing to use is right up there with wining the
state lottery.

What is important is the balun's choking impedance (that's the one
that blocks the common mode current) not its differential impedance.

I suggest you get a copy of TL Details
http://www.qsl.net/ac6la/tldetails.html
and check out just how much variation in impedance you balun will be
seeing.

73,
Danny, K6MHE

email: k6mheatarrldotnet
http://users.adelphia.net/~k6mhe/

On Mon, 08 Aug 2005 06:21:37 -0700, Dan Richardson wrote:



I suggest you get a copy of TL Details
http://www.qsl.net/ac6la/tldetails.html
and check out just how much variation in impedance you balun will be
seeing.

73,
Danny, K6MHE

email: k6mheatarrldotnet
http://users.adelphia.net/~k6mhe/

I'm trying that program out, and under Results, it gives an SWR and
and SWR (50). What's the difference in those two?

Bob
k5qwg