Coax Antenna Lead
 

I am building a new house. I need two coax runs inside the house for
two uses. First, for 2 meter, 440 MHz dual band. Second for 2-30 MHz
HF. I am considering using RG213/U for both runs. I know this coax is
suitable for 440 MHz on runs less than 100 feet. Would there be any
problems for the 2 meter or HF using this coax? Or are there any
suggestions for this project?

Thanks, jimbo

Yes I just installed a 100' run and a 50' of 9914F "direct bury" coax for
VHF and HF respectively. This coax is lower loss than 214 and much more
robust in it's environmental qualities and can be buried directly. I
purchased ready made coax assemblies with silver-plated Amphenol PL259's
attached from RadioBooks Radio Ware

1. http://radiobooks.com/products/ca9914f.htm

9914F is very nearly as lossless as 9913 but is more flexible and can be
directly buried.

--

Charlie
Ham Radio - AD5TH
www.ad5th.com
Live Blues Music
www.492acousticblues.com




"jimbo" wrote in message
oups.com...
I am building a new house. I need two coax runs inside the house for
two uses. First, for 2 meter, 440 MHz dual band. Second for 2-30 MHz
HF. I am considering using RG213/U for both runs. I know this coax is
suitable for 440 MHz on runs less than 100 feet. Would there be any
problems for the 2 meter or HF using this coax? Or are there any
suggestions for this project?

Thanks, jimbo

"jimbo" wrote in message
oups.com...
I am building a new house. I need two coax runs inside the house for
two uses. First, for 2 meter, 440 MHz dual band. Second for 2-30 MHz
HF. I am considering using RG213/U for both runs. I know this coax is
suitable for 440 MHz on runs less than 100 feet. Would there be any
problems for the 2 meter or HF using this coax? Or are there any
suggestions for this project?

Thanks, jimbo


It sort of depends on how much loss is acceptable to you. 9913, for example,
will have about 50% of the loss that 213 gives you at VHF/UHF frequencies.
Remember, that the worse the mismatch (SWR) the higher the loss -- the
tables you see assume a 1:1 SWR, so real world losses are always higher than
what the tables show.

To directly answer your question -- if you are happy with 213 for 440, you
will be happy with it at 144 since the losses will be lower at a lower
frequency.

Not that it is likely to be relevant, but I use 9914 BuryFlex here since to
make my wife happy, I run the coax underground. It should be pointed out
that I don't have an antenna for anything above 6m.

Good luck

Paul AB0SI

Hey Charlie, thanks for your reply. Well, my cable will be inside
walls, not buried in the ground. So, it seems that the RG213 will have
a little less loss and be a little less expensive?

Thanks, jimbo

"jimbo" wrote in message
oups.com...
Hey Charlie, thanks for your reply. Well, my cable will be inside
walls, not buried in the ground. So, it seems that the RG213 will have
a little less loss and be a little less expensive?

Thanks, jimbo


Jimbo:

More loss but less expensive. If the run is short and the mismatch is not
too bad, you can save a few dollars by going with the 213 and accepting
slightly higher losses. Just talk louder.:)

Paul AB0SI

Ah, shortsighted Jimbo:

Consider these: Damage to one of the coaxes, for example. And what about rotator cable? Or suppose you get interested
in another band or mode? My advice to people building new homes is to run conduit wherever you are going to need it,
and make it as big as practical. Then you can pull whatever coax you need, and upgrade when you feel like it. Or at
least be sure there are accessible pull wires wherever they might be needed. And coax has a limited lifetime anyway.

--
Crazy George
Remove N O and S P A M imbedded in return address
"jimbo" wrote in message oups.com...
I am building a new house. I need two coax runs inside the house for
two uses. First, for 2 meter, 440 MHz dual band. Second for 2-30 MHz
HF. I am considering using RG213/U for both runs. I know this coax is
suitable for 440 MHz on runs less than 100 feet. Would there be any
problems for the 2 meter or HF using this coax? Or are there any
suggestions for this project?

Thanks, jimbo

On Sat, 29 Jan 2005 22:34:53 -0600, "Crazy George"
wrote:

Ah, shortsighted Jimbo:

Consider these: Damage to one of the coaxes, for example. And what about rotator cable? Or suppose you get interested
in another band or mode? My advice to people building new homes is to run conduit wherever you are going to need it,
and make it as big as practical. Then you can pull whatever coax you need, and upgrade when you feel like it. Or at
least be sure there are accessible pull wires wherever they might be needed. And coax has a limited lifetime anyway.


Excellent point(s). Except, how do you pull 7/8" Heliax through
conduit? Best to lay in 3 or 4 runs ahead of time.

jimbo wrote:
Hey Charlie, thanks for your reply. Well, my cable will be inside
walls, not buried in the ground. So, it seems that the RG213 will have
a little less loss and be a little less expensive?

Please take a look at LMR-400, another possibility.
--
73, Cecil http://www.qsl.net/w5dxp


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Conduit sounds like a good idea. Would you use metal or PVC?

jimbo


Crazy George wrote:
Ah, shortsighted Jimbo:

Consider these: Damage to one of the coaxes, for example. And what
about rotator cable? Or suppose you get interested
in another band or mode? My advice to people building new homes is
to run conduit wherever you are going to need it,
and make it as big as practical. Then you can pull whatever coax you
need, and upgrade when you feel like it. Or at
least be sure there are accessible pull wires wherever they might be
needed. And coax has a limited lifetime anyway.

--
Crazy George
Remove N O and S P A M imbedded in return address
"jimbo" wrote in message
oups.com...
I am building a new house. I need two coax runs inside the house
for
two uses. First, for 2 meter, 440 MHz dual band. Second for 2-30
MHz
HF. I am considering using RG213/U for both runs. I know this coax
is
suitable for 440 MHz on runs less than 100 feet. Would there be any
problems for the 2 meter or HF using this coax? Or are there any
suggestions for this project?

Thanks, jimbo

On Sun, 30 Jan 2005 12:49:20 -0600, Cecil Moore
wrote:

jimbo wrote:
Hey Charlie, thanks for your reply. Well, my cable will be inside
walls, not buried in the ground. So, it seems that the RG213 will have
a little less loss and be a little less expensive?

Please take a look at LMR-400, another possibility.

When I upgraded my antennas (6 and 2 meter) I also upgraded the coax
from 213 to LMR-400-flex due to the lower loss. At 70 cm the 213 is
~6dB of loss and that is rather significant in my estimation,
especially when LMR-400 or 9913 is ~ 3dB. Considering the effort and
dollars that goes into putting up a decent antenna I feel the extra
cost of the coax is worth it.