9880 reply excerpts
Sun, 9 Feb 1997 12:35:46 -1000
HERE ARE EXCERPTS FROM SOME OF THE 9880 REPLIES. I HAD
DELETED A COUPLE THAT COVERED THE SAME GROUND.
THANKS TO EVERYONE,
I have a section of cable that matches your description. I picked it up
at a swap meet in northern CA. for very little. The guy who sold it to me
said that the cable had been mfd. for Eathernet installation. I have been
using a piece for connecting my wide range discone to a IC-706 for vhf
2mtr. use . It has performed well with no problems. My only concern would
be in how much power it can handle. You can call Belden and they can give
you the specs.
This stuff is good...can use with max power linears.
A group here in NY uses this stuff..
according to my belden catalog that is an ethernet trunk cable. it has
a cellular poly dielectric. the center conductor is .0855" solid tinned
copper(just a little bit bigger than 12ga). they don't quote specific
loss figures for it but they have a generic table for trunk cables that
show 1.0 db/100' at 50MHz. the jacket is listed as yellow pvc. the
diameter of the dielectric is a bit odd, its .247"compared to .285" of
normal rg-8 types so some connectors may not fit properly, but pl-259's
should be ok since the outside diameter is the same.
compare to 9913 which is in a different section under low loss vhf/uhf
coax cables. center conductor is 9 1/2ga solid bare copper, semi-solid
poly dielectric, .64db/100' at 50MHz, and a black pvc jacket.
i would expect it to be ok for most applications, i'm not real sure
how they yellow pvc might hold up outside in the sun. and of course
being a solid center conductor it won't be as flexible as rg-8 with
a stranded center conductor, but should be better than 9913.
hope that is helpful.
David Robbins K1TTT (ex KY1H)
Belden 9880 is Ethernet (AKA Thick Ethernet) cable is roughly equivalent
to RG-8 Foam.
Loss at 400 MHz
9880 3.9 dB
8214/RG-8 Foam 4.2 dB
9880 has four layers of shielding foil/braid/foil/braid.
It is not a Mil-C-17 spec cable.
There is one principle draw back to Ethernet cable for outside
applications from what I have heard is they do not have UV stabilizers
in the jacket.
If this is true then the jacket is prone to becoming brittle after a few
exposure to the sun, and crack and flake off. It should be good for
inside applications and field day feed lines.
One thing to watch out for with used Ethernet yellow cable is the
presence of punctures in the cable from Vampire Taps. These are the
places where the Ethernet transceiver was connected to the cable. These
punctures should occur at the black stripes on the cable. They can
usually be spotted by sliding a rag along the cable and noticing when it
I hope this helps
Hook an antenna analyzer to one end, with the other end open.
Go up toward the highest frequency end of the analyzer. Note the
SWR + 1
cable loss (dB) = 10 LOG ------------------------
SWR - 1
If you know how long the cable is, then you can compare it to
9913 or other cables.
Dave Hachadorian, K6LL
That may be ethernet cable. It is good in the low loss dept, but not
good for outdoor use. I don't think it was designed for UV exposure;
this is assuming that we are talking about etherenet cable. I have some
of it, there is a lot of it surplus, as many LANs are using twisted pair
Floyd Soo, W8RO
President, HI-RES Communications, Inc.
Net Manager and Board Member, Collins Collectors Association
Well, what DID you find out? Inquiring minds want to know.
73, Steve K7LXC
Please share with us a summary of the responses you received.
It might be very useful information to others who may find themselves
facing the same question one day.
Dale Martin, KG5U
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