160 Meter DSL Filter Design at PJ2T - Design and Implementation by W8WTS

After several years of being plagued by DSL unlocks while transmitting on 160 at PJ2T, Jim Galm (W8WTS) came up with the following design, which was 100% effective in eliminating DSL problems on 160. Click on each link for the tech data.

 

W8WTS Overall Design - DSL Differential Mode Filter Simulation

Characteristic Curve for WTS Filter, Zo = 600 ohms

Characteristic Curve for WTS Filter, Zo = 28 ohms

Characteristic Curve for ARRL Designed Filter, Zo = 600 ohms

Characteristic Curve for ARRL Designed Filter, Zo = 28 ohms

 

Dr. Jim Galm, W8WTS, in the midst of CQWW 160 CW 2009:

 

Here's the breadboarded filter that got us through CQWW 160 CW 2009 with zero DSL problems: