NE7X - Phoenix Arizona USA

NE7X - Phoenix Arizona USA

Antenna Installation

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The following pictures are a sequence of the NE7X antenna installation. Due to the large amount of pictures, I have broken this website into multiple pages. Follow the link at the bottom of each page to view the next sub-page.

The tower is self-supporting Rohn HDBX-48 with a 14 ft long poly-steel mast. Antennas are (from the top); Comet VHF/UHF dual-band vertical, Cushcraft D3W 30/17/24 meter dipole, M-SQ 6 meter yagi, and Cushcraft TH-5 20/15/10 meter yagi. The rotor is a Hy-Gain HAM-IV and utilizes two thrust-bearings to support the mast.

My special thanks and recognition goes to everyone who helped make this installation happen. I couldn't have done it without the following: W7LMW, K7SA, N7RK, WA0KDS, WE7K, K5ML, KI7V, WO7T, Don (SWL), Brian (SWL) and others.

10m 5/8 wave Vertical / TH-5 20-15-10m Yagi up 50 feet

Construction Begins

February 1st, 2007

Placement
Antenna turning radius is 18 ft, center of tower distance from property line is 21 feet.

The 21 ft distance from the property line exceeds the minimum 10 ft City Of Phoenix set-back requirement.

Antennas attached to the tower structure are not required to be part of the building permit.

Antennas fall under the same building code guidelines as roof gable overhangs and cannot extend over the property line.

February 2nd, 2007

As you can tell there are no CC&Rs or HOAs. All that is needed is a:

City Of Phoenix building permit

Click on picture to view permit in detail (.pdf format)

City Of Phoenix building code, IBC2003, Zoning R1-10, variance 701(B) states:

The maximum residential building height limit of 40 feet can be exceeded for flag poles and amateur radio towers

To obtain a City Of Phoenix building permit,

the following was required:

Fill out and submit a City Of Phoenix building permit application and include payment of $48

Attached the following documents to the application:

Rohn BX tower structural engineering drawings signed/stamped by a structural PE (Professional Engineer) licensed in the State Of Arizona. Drawings were obtained from the tower manufacture and submitted to the PE for certification. I used S.E. Consultants in Phoenix Arizona.

A "D" size plot map of the home property showing the location where the tower will be installed. The "D" size plot drawing was obtained from Google Earth website and printed at Kinko's. I then drew a X on the plot drawing labeling it as the tower location. You need to show the City Of Phoenix minimum 10ft set-back requirement from the property line is met. In the lower right corner of the drawing I also wrote the street address, lot and subdivision location information. This information can be obtained from the city clerk, loan documents or off your annual estimated assessed property tax statement. On the plot map include a measurement aspect ratio, (inches = feet) on the drawing.

An imposed loading and antenna grounding diagram. This drawing shows a 45 deg line from house foundation which must not transverse the radio tower foundation. This is to insure if any one foundation shift occurs, the other near foundation will not be imposed or compromised by that shift. The drawing also shows electrical grounding for lightening protection. I drew this document myself.

Once the building permit was obtained, construction could begin. During the construction period I had three visits from the city building inspector: 1) foundation (rebar) and location, 2) electrical grounding (lightening protection), 3) final mechanical structure and safety. Once all three inspections passed, a certificate of occupancy was given.