3 Star Inc FRM-HDW Non-Penetrating Flat Roof Mount BASE ONLY for 1.50"-2.25 inch OD Antenna Mast
3 Star Inc
Made in the USA!
The FRM-HDW is a Base Only, User Supplied Mast, Non-Penetrating Roof Antenna Mount and is Ideal for Light Off-Air TV, Cellular, Wireless Internet, SCADA, CCTV, Telemetry and Small Diameter Narrow Beam-width Antenna mounting and can be used in Non-Penetrating, Guyed or Bolt Mount Flat Roof or Ground level configurations. The Assembly comes with a GR-3 Universal Clamp that accommodates masts from 1.5 to 2.25 inch OD and set screws to secure. The mast You supply will need to be drilled to accept a 1/4-20 carriage bolt that secures the mast bottom to the Frame Base. The FRM Base provides a stable, temporary or semi‑permanent mounting solution that avoids roof membrane penetrations, is constructed of pre-galvanized 12 Gauge steel and typically uses 8 standard (8 x 8 x 16 inch) concrete blocks as Ballast on a 35.5 x 35.5 inch Rectangular Base Frame. This Order is for the Base Frame Only (No Mast, Cinder Blocks or Mat Supplied). Bring your own Mast and drill to fit!
Height and Antenna Loading capability are dependent upon ballast weight to counter the tip-over moment of the Windspeed rating desired. In addition to the Windspeed Loading Data found under the "Specification" tab (if Available), You need to Consult an Engineer to determine the Building Code Requirements and Load Bearing Capacity of the roof structure where you will be installing this mount. It is Important to choose a Mount and Mounting Location with a Picture of the Finished Installation in Mind. Be Sure to First select a location that lends itself to applying a Load without Compromising the Integrity of the Material you place the mount on top of; i.e. roof membrane, covering, decorative cover, etc., or the Structural Members beneath. Next consider the Location over a Lifetime of Adjustments, does it lend itself to modifications in Height or Direction? Larger Antennas increase the surface area presented to air movement and thus, Wind-load does increase. As the height of the mast increases from Its last attached point on the structure, the torque applied in cantilever towards the tip-over moment also increases with Antenna off-center Weight and Wind-Load EPA (Effective Projected Area), requiring a more substantive Downward Force and/or Load Dissipation; i.e. supplemental Down-guys may be required as to keep ballast weight within Load-bearing capacity. Keep the Distance Minimal from the Antenna to the Equipment you feed, as to minimize loss and the need for Amplification.
A Retention Tether SCK150 (Safety Cable Kit) is required for Commercial Installations to mitigate Loss and Damage to Property, Further, the FRM-PAD or FRM-MAT is recommended for all installations to prevent slippage, distribute weight more evenly and prevent damage to the roof surface
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*Redesign Improvement from Legacy "RT" to New "RTL" Towers*
The "RT" Series Tower Sections had cross bracing segments that spanned from one Tower Section to the next.
The "RTL" Series Towers Sections feature cross bracing that starts,stops and is totally contained within the same Tower section; making it easier to assemble a complete tower section on the ground for lifting and easier attachment/fitting to the next Tower Section during erection.
Rohn RTL Light Series Standard Design Tower Kits
Ordering Notes
Things to keep in mind when ordering a Rohn RT Tower Kit:
Items That ARE Included
- Step bolts on ONE TOWER LEG are provided for the full height of the tower.
- The RTL Tower kits are supplied with pal nuts as nut-locking devices. Alternative nut-locking devices can be substituted by indicating the type you would like in the order notes when checking out. The available nut-locking devices are: Split-Ring Lock Washers, Anco Nuts and Tri-Loc Nuts.
Optional Items That ARE NOT Included
- Anchor rod kits. For your convenience, Anchor Rod kits appear as optional selections provided to you when adding a tower kit to your cart. Options include a full tower base template with anchor rod clusters or an anchor rod cluster kit that includes the anchor rods and a top and bottom template for each tower leg.
- Accessories like grounding kits, lightning rods, mounts, WIG ladders or brackets, etc. are not included
- The Safety Climb System is ordered separately.
- Contact us if you require any assistance in determining the adequacy of a specific RTL tower kit for site-specific applications.
Design Notes
- The ROHN Standard Light, Medium and Heavy Series RTL towers are based on the wind, ice and earthquake requirements of the ANSI/TIA/222-H Standard.
- The suitability of a ROHN standard RTL tower kit and standard foundation for a specific application must be verified by the purchaser based on site-specific data in accordance with the ANSI/TIA-222-H Standard. All users are solely responsible for the installation, use, maintenance, inspection and other work and the compliance with all local, state and federal requirements.
- The allowable Effective Projected Areas (EPA) tabulated represent the summation of the projected areas of all antennas, mounts, and accessories multiplied by appropriate drag factors and are assumed to be symmetrically mounted on the tower. Eccentric loading may increase member forces and may require a reduction of the tabulated EPA values.
- The tabulated EPA values apply to towers installed at ground level. Lower EPA values than tabulated may apply for roof mounted towers or for towers located on sites with unusual terrain.
- The EPA values are determined for ANSI/TIA-222 Topographic 1 tower site conditions (no abrupt changes in general topography) surrounded by Exposure C terrain (open unobstructed areas). For the Light Series towers, higher EPA values are provided for tower sites surrounded by Exposure B terrain (urban, suburban or wooded areas). Lower EPA values would apply for tower sites exposed to Exposure D terrain (open water or smooth unobstructed areas).
