coax
 

What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Dave;
Using bury-Flex for maximum years before replacement due.
Great coax.
73-Jim

KC1DI wrote:
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Dave;
Using bury-Flex for maximum years before replacement due.
Great coax. The only and most important link between transmitter and
antenna.
73-Jim

KC1DI wrote:
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

for what bands dave?
for HF RG213 would do you nicely
but if your doing VHF/UHF you really need a good coax like 9913F or
LMR400 they have a buryflex just dont recall the model number
keep in mind at VHF freqs 100 or more you really start to lose a lot of
RF with cheap coax
RG213 at 400mhz @100ft is more than 9db of loss which is a lot
good luck

KC1DI wrote:

What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Dennis Kaylor wrote:
RG213 at 400mhz @100ft is more than 9db of loss which is a lot

With 200 ft. of RG-58 on 400 Mhz, one doesn't even
need an antenna. :-)
--
73, Cecil http://www.qsl.net/w5dxp


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"Cecil Moore" wrote in message
...
Dennis Kaylor wrote:
RG213 at 400mhz @100ft is more than 9db of loss which is a lot

With 200 ft. of RG-58 on 400 Mhz, one doesn't even
need an antenna. :-)
--
73, Cecil http://www.qsl.net/w5dxp

Or a tuner.

Dale W4OP

On Thu, 14 Apr 2005 10:59:19 GMT, Dennis Kaylor
wrote:

for what bands dave?
for HF RG213 would do you nicely
but if your doing VHF/UHF you really need a good coax like 9913F or
LMR400 they have a buryflex just dont recall the model number
keep in mind at VHF freqs 100 or more you really start to lose a lot of
RF with cheap coax
RG213 at 400mhz @100ft is more than 9db of loss which is a lot
good luck

Better check your numbers again. RG213 is more like 4.7 dB/100'
@400MHz

KC1DI wrote:

What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

I used to bury RG-213. It'll last longer if you slide it into some
cheap garden hose before burying. Scrap and second hand hardline is a
better bet and is really long-lasting. I got some new scrap pieces of
over 100' of 1/2" Andrew for free and bought 200' of used 7/8" Andrew
hardline with connectors locally for $50. It replaced 1/2" stuff at
VHF/UHF. The difference is noticeable.

Check with your local broadcast stations and 2-way radio shops.

Dave Heil K8MN

KC1DI wrote:
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Thanks to all for your input, the installation will be for HF and
100watts or less so I've decided to go with some direct bury RG6 which I
can get from the Local cable company at a good price. Should work ok.
73 Dave

"KC1DI" wrote in message
...
KC1DI wrote:
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Thanks to all for your input, the installation will be for HF and
100watts or less so I've decided to go with some direct bury RG6 which I
can get from the Local cable company at a good price. Should work ok.
73 Dave

IIRC RG6 is 75 Ohm!

Or an SWR meter....:/ With that much loss, even a dead short
would probably look acceptable...
As far as 213 coax, it *is * a direct bury coax. You can bury it
no problem. Rg-6 is a 75 ohm coax used for TV/Cable.
It will work, but it would be better to use a 50 ohm line, being
you have a 50 ohm rig...Will cause you appx a 1.4 to 1 mismatch,
with is no big deal really...It will reduce your "usable" bandwidth
though...I use 213 on VHF for short runs...Some loss, but not
enough to kill you...None of my coax runs are over 50 feet..MK

Roger Conroy wrote:
"KC1DI" wrote in message
...

KC1DI wrote:

What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave


Thanks to all for your input, the installation will be for HF and
100watts or less so I've decided to go with some direct bury RG6 which I
can get from the Local cable company at a good price. Should work ok.
73 Dave


IIRC RG6 is 75 Ohm!


there's nothing wrong with 75 ohm line 1:4 to one difference in swr..
used 75 ohm line for years becaust I had a bunch.. of it.
73 Dave kc1di

I have about 175 ft of Davis "Direct Bury" Low Loss 9914F total at my
station. It is superb 50 ohm low loss coax that requires no "garden hose"
or "pvc" tubing. Just slit the soil or trench it and lay the coax in. At HF
frequencies it is virtually lossless. It is within .1db in loss as compared
to 9913 plus it is very flexible and can be used on rotators directly where
9913 cannot. And moreover 9913 cannot be buried directly.

IMHO it is the best coax to use.

--

Charlie
Ham Radio - AD5TH
www.ad5th.com





wrote in message
oups.com...
Or an SWR meter....:/ With that much loss, even a dead short
would probably look acceptable...
As far as 213 coax, it *is * a direct bury coax. You can bury it
no problem. Rg-6 is a 75 ohm coax used for TV/Cable.
It will work, but it would be better to use a 50 ohm line, being
you have a 50 ohm rig...Will cause you appx a 1.4 to 1 mismatch,
with is no big deal really...It will reduce your "usable" bandwidth
though...I use 213 on VHF for short runs...Some loss, but not
enough to kill you...None of my coax runs are over 50 feet..MK

KC1DI wrote:
there's nothing wrong with 75 ohm line 1:4 to one difference in swr..
used 75 ohm line for years becaust I had a bunch.. of it.

Back in the '50's, 75 ohm line matched the alleged
feedpoint impedance of a 1/2WL dipole and nobody
used an SWR meter anyway. All we ever monitored was
grid current and plate current. :-)
--
73, Cecil, W5DXP

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Cecil Moore wrote:
KC1DI wrote:

there's nothing wrong with 75 ohm line 1:4 to one difference in swr..
used 75 ohm line for years becaust I had a bunch.. of it.


Back in the '50's, 75 ohm line matched the alleged
feedpoint impedance of a 1/2WL dipole and nobody
used an SWR meter anyway. All we ever monitored was
grid current and plate current. :-)
--
73, Cecil, W5DXP

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News==----
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Newsgroups
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Hi Cecil,

I know it was about the same as when I got my first ticket in 1966.. and
the funny thing was we made plenty of qso's before I even new about SWR
that magical thing everyone worries about today..
73 Dave KC1DI

KC1DI wrote:

KC1DI wrote:
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave

Thanks to all for your input, the installation will be for HF and
100watts or less so I've decided to go with some direct bury RG6 which I
can get from the Local cable company at a good price. Should work ok.
73 Dave

I'd be a little wary of using RG-6. It is 75 ohm cable, will be quite a
bit lossier than RG-213 or similar sized cable for your 100 foot run,
even at HF generally has an aluminum shield. That means you'll likely
have to use an "F" female to PL-259 adapter.

I've used the stuff for feeding a beverage receiving antenna for 80 and
160m but I wouldn't use it for much else.

Dave K8MN

Well, moisture and electrical conductors just cater to my paranoia's....

I encased my coax in underground PVC conduit, which I cemented all joints
on, and then "air tested" (sealed the conduit ends and pressurized to 15 LBS
and made sure there was no noticeable loss over a few days.)

I still worry about it--in the wee hours of the morning--when I can't sleep
grin



Regards,
John
"KC1DI" wrote in message
oups.com...
What type of coax are you using for direct burial ? I need to burry
about 100 feet to get to my new antenna and was wondering if it is
really worth the money to go with bury-flex.
your thought are appreciated.
73 Dave