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Redmond-type monuments are low cost
bedrock monuments modified from the RBUT UNAVCO design. The monument consists
of a 3 meter length of 2.5 cm diameter INVAR rod with a center punch on the
end as the mark. The INVAR rod is set vertically within vertical 2 meter-deep
drill hole, leaving about 1 meter of rod above above the surface. Non-shrink grout
anchors the INVAR rod within the lower 1.5 meters of the drill hole. A concrete
collar with epoxy-coated rebar reinforcing surrounds (but is not directly attached
to) the INVAR rod for horizontal stabilization.
If you are interested in receiving a copy of the Redmond drawing,
please e-mail charlier@geology.cwu.edu,
or download the REDM drawings as a GIF file.
Technical drawing
Installation costs
We used Trimble SSI receivers and choke ring antennas with stainless steel
recoverable antenna mounts. The antenna mount was modifed from a Mark Smith (JPL)
and Frank Wyatt (Scripps) design. The antenna cables are buried and encased in
liqutite conduit or liqutite armored cable. The conduit and cables connections are
protected by encapsulated shrink tubing.
All of our sites have secure and covered facilities. We use
NEMA/EEMAC Type I enclosures
with bulkhead fittings. The enclosures contains the GPS receiver, U.S.
Robotics 56 kbs modem and heavy duty surge protectors.
