Steve Friis wrote:
Jim Tolbert wrote:
When considering adding a portable digipeater to a kit, what does an
antenna mast buy you and what is the relationship between height and
effectiveness?
What is antenna height & specifications and equipment specifications
that should be considered for a permanent antenna, centrally located
in the county?
We are in Burnett County, Wisconsin ..... according to the U.S. Census
Bureau, the county has a total area of 2,280 km² (880 mi²). 2,128 km²
(822 mi²) of it is land and 152 km² (59 mi²) of it (6.69%) is water.
There are small elevation changes in the county (800 feet to 1440 feet
above mean sea level) and the land is largely forested.
Many thanx ............. jt
My experience shows that doubling the height is equal to multiplying the
power by 4. This is especially true if you can get above the tree-tops.
Here in the desert, you can really increase the range by adding height.
I bring a 25' pole to mount both the HF antenna on plus the dual band
VHF/UHF antenna.
My portable repeater exploits suggest that an antenna should be between
20-40 feet as a minimum... or else just left on the car. You see
benefits with antenna height above local terrain that cannot be
compensated for by either power or preamplification.
I tend to shoot for one of several 30 foot portable masts I have
available. One of the simplest is a "bull-float" handle available from
concrete supply stores (but probably not Home Depot). they're ~1-3/4"
diameter threaded poles, 10 ft long. I've put up to 4 together with
3-way, single level guying and had the antenna up for as long as a week.
Easy to carry and handle, and total cost of the mast was less than
$80. Very rugges... they have to be to survive the concrete business.
gerry
--
Gerry Creager -- [EMAIL PROTECTED]
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX 979.862.3983
MAIL: AATLT, 3139 TAMU
Physical: 1700 Research Parkway, Suite 160,
College Station, TX 77843-3139
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