Most Popular Articles
Variation on the Shielded-Loop AM Antenna
Greg Manfroi of WIUM/WIUW, Western Illinois University, Macomb, IL,
sent us this idea on a construction method for the shielded-loop AM
Start with the electrical specifications as described in the companion article. Once the loop is built, it must be supported in a ring to yield the best results. One way of doing this is to create a loop of PVC pipe. This will result in a square if 90-degree elbows are used or an octagon if 135-degree elbows are used. Cutting the pipe and assembling the loop can be time consuming. Instead of PVC, Greg substituted a material that is sturdy, almost perfectly round, and in most cases, easily found in any toy store or discount department store. Greg’s idea was to use a hula hoop, which are available in large and small sizes. The small size is just right. Some hoops have a seam that can be easily opened, but if not, cut a hole so the "magic hula beans" (as Greg calls them) can be removed. The wire is fed through the hollow hoop.
A common hula hoop is a readily available item that can be used to house a home-made shielded-loop AM antenna.
For the connector, Greg opened a 75-ohm cable splitter and drilled
out the dual-port side. The wire connections were made inside the
splitter shell. The shell was reassembled and then attached to the hoop
with a silicone sealant.
A standard splitter makes a convenient connector and wire-termination housing.
Greg reports that only drawback to using a hula hoop is that they
come florescent colors that are typically not associated with
industrial-use applications. Greg was able to find a shade of blue that
was not too objectionable.
The result is a shielded-loop AM antenna in a perfect circle with a built-in F connector. His cost of parts was less than $3.00 for the hula hoop. He already had the wire and splitter.
Acceptable Use Policy blog comments powered by Disqus
[an error occurred while processing this directive]
Today in Radio History
The history of radio broadcasting extends beyond the work of a few famous inventors.
Read each issue online in our Digital Edition Format in your Web browser.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Cumulus builds a new campus in Nashville to house its NASH family of brands
Browse Back Issues[an error occurred while processing this directive]
Also in the October Issue
- Trends in Technology: Alternate Transmitter Sites
- Tell City Waiver Denied
- 2014 Radio magazine Salary Survey
- Field Report: Steinberg UR44
- Repurposing Older Equipment