User manual BARKER & WILLIAMSON AP-10A WINDOW PORTABLE ANTENNA

[. . . ] It has proven its ability to provide a quick and dependable antenna system when regular antennas cannot be used. The AP-10A has also found application in emergency communication work when conventional antennas have been put out of service. When adjusted properly to your operating frequency, VSWR is 1. 1:1. [. . . ] First, the fly lead must be set on the coil. Then, the counterpoise length is adjusted and fine tuned for good VSWR. The table will give you settings for common bands. To set the fly lead on the coil, check the table for the number of windings down from the top of the coil to clip to. Figure 2 shows how to count the windings from the top (the end the whip attaches to), and where to locate common bands. When using the clip on the fly lead, make sure that the screw is loose before pushing on or pulling off the coil wire, then tighten the screw moderately. The clip is best attached next to a plastic rib on the coil, where the wire is held up the highest from the PVC support pipe underneath. When adjusting the counterpoise length, roll up the unused portion into a coil. A giant size paper cup works great for this, or simply use your hand. Start out at the suggested length in the table, and then fine tune with a VSWR meter or power meter. The counterpoise may be laid on the floor. Best results will be obtained with the counterpoise parallel to the antenna. For rooms above the ground floor, slight improvement in operation can sometimes be noted by hanging the counterpoise outside, down the wall. For operation on a boat or mobile home where the deck or floor is metal, the counterpoise may have to be stretched two or three feet above that surface. When you achieve a good SWR, mark the counterpoise and coil for a favorite band with a magic marker. If you cannot adjust the SWR low enough with the counterpoise, but have seen a definite dip, you need to readjust the flylead. [. . . ] The warranty applies to the original purchaser only, and we will repair or replace the product at our discretion. Under no circumstances will Barker & Williamson be liable for any damages or consequential damages arising from use or misuse of our products. Warranty is voided if product is subject to misuse, neglect, accident, improperly installed or used in violation of the instructions furnished by us. [. . . ]