Via Bottom Top, Standard HOOK-UP | Ramsey Electronics LPY915

STANDARD HOOK-UP

Normal applications are well suited by the default performance of the unit without the need for cumbersome reflective elements. The standard wiring configuration is simply to use the Logi as the complete antenna and merely add a means of connection for your radio. The easiest method to interface your antenna and radio is through the use of a coaxial cable with a pre-mounted connector. Standard RG-58 and a BNC connector are often used by ‘scanner buffs’ to quickly and easily monitor the airwaves. Other types of coaxial cable such as RG-142, .141 and .085 semi-rigid will also provide you with a good low loss connection as well as excellent high frequency characteristics.

Let’s take a look at the circuit board for a moment to become more familiar with its layout. The bottom side is the ‘ground’ connection and is labeled with the designers call sign “WA5VJB”. Notice that the via (the small plated through hole) near the narrow front of the board is not directly connected to the center trace on the bottom side. It is directly connect on the top side however.

Via

Bottom

Top

1. Scrape off the protective solder mask coating on the bottom side center ground trace with a razor. Only remove the mask along the center trace, not the perpendicular elements. Be careful not to accidentally cut them while removing the mask. This is where you’ll attach the ground shield of your coax.

2. Tin the center ground trace you just scraped with a thin layer of solder. This will make mounting the ground conductor easier in a moment.

3. Measure back 4 3/4” from the open end of your coax and remove the outer protective sheath (if applicable) to expose the ground conductor.

4. Using a small pair of wire cutters (or a razor for the semi-rigid coax variety), clip away a 1/2” of the ground braid from the same open end to expose the inner dielectric layer.

5. You now need to trim away the end 7/16” of the inner dielectric layer giving access to the center conductor. Position your razor for the cut and roll the coax on the table top to slice through the entire circumference (Don’t mark-up the wife’s table!!). The end goal is to leave about 1/16” of

the dielectric between the ground conductor and the center conductor.

6. Carefully tin (solder the braid wire together to keep it from fraying) the first 1/4” of the ground braid. Be careful not to melt the dielectric with too much

heat.

4 1/4"	7/16"
	1/16"

LPY2 • 5