I like LMR400. We ordered spools of it along with N connectors for the
workplace when we rebuilt our GPS antenna distribution system. We have
preamps built into the antennas and in the splitter, but the coax runs
from the antennas are about 100 ft and at 1.5 GHz, LMR400 works very
reliably. The system we replaced used RG-213, which was marginal. Some
hams say that LMR400 is noisy, and they buy Belden 9913. I think that's
an urban myth, and I hear that water can get into the 9913 because it is
mostly air dielectric. To each his own.
I have to laugh about the idea of burying open wire or window line. The
whole idea of using window or ladder line today is to reduce dielectric
losses by making sure that most of the dielectric between the conductors
is air, so that attenuation under a high SWR will be minimal. Now
replace the air with a lossy dielectric like dirt and see what happens.
In 1991 I found myself in a foreign land. The hotels were in a line on
the beach and a couple of blocks in were several embassies. I amused
myself by walking around spotting antennas. Except for one big log
periodic, all of the embassy rooftops sported dipoles fed with good old
600 ohm ladder line.
73,
Bob WB2VUF
On 8/13/2013 11:41 AM, Mike Bryce wrote:
You're right, Jim,
I ordered the LMR400 and had a bit of worry about how well the copper clad
would hold up to the soldering iron.
seemed to work okay, but that stuff sure is hard to work with.
Mike Bryce, WB8VGE
the heathkit shop
SunLight energy systems
J e e p
o|||||||o
On Aug 13, 2013, at 3:19 AM, Jim Brown wrote:
LMR400UF (Ultraflex) has stranded copper center. :LMR400 has copper clad Al.
Two different cables.
73, Jim K9YC
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