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Radio Broadcast Technical Consulting and Sales
10032 Island Drive, Brainerd, MN  56401

Aluminum box for directional commonpoint impedance control built for and installed at KWAD AM Radio in Wadena, MN.

This is 1-inch angle stock framework for an equipment enclosure which is about 3 feet wide, 2 1/2 feet deep, and 1 foot high.  The box was constructed this way so the 1/8" thick aluminum side panels can be removed and the equipment serviced.

There is a yellow one-foot ruler in front of the enclosure to help you understand the size.

In the front center there is an aluminum panel with three 1/2 inch transmission line ports.

The box is used to house the commonpoint impedance controls for the KWAD-AM phasor system.

To the left is a detail of an inside corner of the box.  It isn't pretty, but aluminum stock, on the inside, is used to join the outside aluminum stock pieces together.

To the right is an outside corner.  Note that the 1-inch aluminum angle stock has mitered 45-degrees at the corner.  The aluminum angle stock is screwed together with flat-head bolts which are countersunk into the stock.  This allows aluminum side panels to be installed without distorting their shape. 

The three 1/2-inch transmission line ports are shown here on the inside of the box.  This entire box took about four shop hours to build.  Not shown are the aluminum top and side panels.  
Here is your intrepid broadcast engineer, Mark Persons, at the KWAD-AM transmitter site.  He is standing next to the 1948 vintage E. F. Johnson two-tower phasor.  On top of the phasor is the commonpoint adjustment network as described above.  The station runs 1000 Watts non-directional day and 1000 Watts directional night. 

To the right is a rack with the antenna monitor and a Nautel J1000 AM Transmitter.  The transmitter is insulated from the rack with fiberglass rack stand-offs to reduce the likelihood of lightning damage.  Further to the right is the Gates BC-1G AM backup transmitter.

Questions?  Email Mark Persons:  teki@mwpersons.com       

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page last edited 02/22/2016