Ham radio operators have a long history of using pan adapters to visualize an entire range of the radio spectrum. Traditionally, an adapter was essentially a spectrum analyzer that shows a trace where the X-axis is the frequency, and the Y-axis shows the signal strength at any particular frequency. You can quickly find either busy frequencies or empty frequencies at a glance. To understand this hack, you have to remember how a superheterodyne receiver works. A mixer adds or subtracts a variable frequency with the frequency of interest. This shifts the received frequency to a fixed frequency where the radio can easily amplify and filter the signal. This is known as the intermediate frequency or IF.
Anita and I like to take advantage of the mild fall weather to do antenna projects at our QTH. The combination can work on any band from m up to 10m. We set ours up for operation on the 80m and m bands. It can also be applied to a noise source to null it out. To ensure a good ground for the elements and to improve their sensitivity, we opted to install 4 radials on each antenna the black wires coming from the bottom of the unit in the picture above. Should the outer jacket become nicked, the flooding glue inside the cable will seal the damage and keep water out of the cable. These chokes need to be installed on ground rods near the Antenna Elements for best performance.
The lowest-priced item that has been used or worn previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See details for description of any imperfections. I have purchased many manuals from Kay and they are the best I have ever seen.