scwis's picture

Member Since:

December 7, 2005 - 19:20

Experimental broadcasting for a better tomorrow!

Latest Posts

Sep 12, 2009 John Smick's writings on SW Part 15 circa 2001

Shortwave or HF Part 15 Stations (13,553 - 13,567 kHz)

Jun 17, 2010 Another approach to 13.556 MHz I just ordered this Budget Shor
Apr 12, 2007 Time to get a HAM ticket :-)

and add my Part 15 operation to the top!

Jan 01, 2007 Oregon Sea Grant Low Power Radio Page (now gone) @#*&%!!! I went to check this page and its 404. Stolen from the internet archive.

Low Power Radio

Information systems form the backbone of the recreation and tourism industry. Effective communications serve as an information bridge to expand visitor information about available business services and heighten natural resource appreciation. Information technology can also convey messages about safety and recreational etiquette.

Low-power radio is one way to bridge that information gap. This technology uses a small, relatively inexpensiive AM transmitter to broadcast short, preprogrammed messages over a limited area. Visitors can tune in from their cars or boats and hear messages about a particular locale, attraction or facility. The message order can be changed remotely, by telephone. Small signs in strategic locations tell people where to tune in to hear the information.

Sea Grant Extension specialist Bruce DeYoung has helped state agencies, chambers of commerce and others test and develop low-power radio programming:

  • A Real Player VIDEO About Low Power Radio
  • In Newport, Gold Beach and Salem, where Chambers of Commerce use LPR to inform tourists of events, activities recreational opportunities and traffic flow.
  • At Boiler Bay State Park, where visitors can tune in and get tips on how to spot migrating whales, and information about the park's natural history.
    • Preliminary Findings: Low Power Radio Project at Boiler Bay State Park, OR (below)
  • At Seal Rock, where a summer-long pilot project taught people about fragile tidepool ecosystems - and how to keep from damaging them.
  • At the Port of Newport, where LPR informs passersby about the history, economics and sights of a working fishing port.
  • At OSU's Hatfield Marine Science Center, where visitors can find out about Visitor Center hours, activities, history and other information before they step out of their cars.

Low Power Radio Project at Boiler Bay State Park, OR

Dr. Bruce DeYoung, Professor of Business Administration and Sea Grant Extension Specialist, Oregon State University
Erin Williams, OSU Graduate Research Assistant


The Oregon Sea Grant Program and the Oregon Parks and Recreation Department collaborated in a demonstration and applied research project at Boiler Bay State Park during March through September, 1998. This project evaluated the effectiveness of low power radio (LPR) in providing coastal resource interpretation and safety information to park visitors.

LPR is a limited broadcast range AM radio station that park visitors can tune in on their car radio to hear prerecorded messages and real-time weather information. The LPR transmitter used at Boiler Bay State Park is a 100 milliwatt station, which broadcasts within a radius of about 0.5 miles. The U.S. Federal Communications Commission does not require licensing for this size station and commercial sponsorship is allowed.

Evaluation Methodology:

A LPR unit was installed and broadcast messages in Boiler Bay State Park during Oregon State Parks "Whale Watching Spoken Here" week, March 21-28, 1998. Throughout this week, the researcher spoke with park visitors to learn reactions to the LPR technology and gain suggestions for future educational messages. Many visitor suggestions were incorporated into the message script subsequently created for the summer research project.

The summer LPR messages included: Boiler Bay points of interest, Gray Whale natural history and migration, and a rebroadcast of NOAA Weather Radio over this AM bandwidth. Several research parameters were tested during the research project: how signage numbers influenced LPR listenership, and if a relationship exists between specific demographic characteristics of park visitors and their tuning into the LPR broadcast.

Visitor surveys were conducted three days a week from July 1, 1998 to August 2, 1998 during 10:30 AM to 2:30 PM. Each of the five weeks had a different number of LPR broadcast signs posted to discover if signage numbers and/or location influenced visitor listenership.

Preliminary Findings:

This synopsis reports on preliminary research study findings from a LPR study taking place during the summer of 1998 at Boiler Bay State Park, located on Oregon's central coast. During the five week survey period, occupants from more than 800 vehicles (ie. cars, trucks, RV's or motorcycles) were interviewed on-site. Preliminary data analysis provides an initial sense of overall study findings:

  • Approximately 20% of park visitors interviewed during this study listened that day or another to the LPR broadcast at Boiler Bay State Park. If the broadcast continued throughout the year, this would translate into approximately 20,000 vehicles tuning into the LPR broadcast for interpretative and other information messages (ie. based on 100,000 vehicles annually visiting the park);
  • Over 40% of interviewed park visitors not initially tuning into the LPR broadcast said they intended to listen to the broadcast before leaving the park. Most of these noticed LPR signs while walking around the park, but were interviewed prior to reentering their vehicles and turning on the radio broadcast.
  • More than 85% of listening park visitors interviewed during this study liked the idea of using localized radio broadcasts to receive park information. These interviewees recommend that Oregon State Parks continue LPR broadcasting at Boiler Bay State Park and also provide LPR information broadcasts at other State Parks;
  • Almost 70% of park visitors interviewed on-site during this study indicated having an urban or metropolitan domicile.
  • One sign located at each park entrance alerting visitors to the LPR broadcast is not as effective as additional signs strategically placed throughout the park.

Summary of Preliminary Findings:

State parks in Oregon provide important sites for visitor recreation and natural resource education. With increasing number of visitors to Oregon coastal parks, tide pools and beach areas there is a growing need for site specific marine education to enhance stewardship, interpretation and safety knowledge.

Preliminary results from this study indicate that Low Power Radio broadcasts are a promising communication strategy for reaching park visitors with an array of useful information. Many park visitors interviewed during this study found LPR to be a great tool for enhancing their state park visit.

News and Communications Services

Sea Grant tests low power radio during whale watch week


Feb 14, 2013 Old reference page for schematic symbols, circa 1965

Handy for reading old schematics