| Evaluation of a low-cost Chinese directional coupler for 23cm and 13cm bands - DD1US |
| Evaluation of a low-cost Chinese directional coupler for 23cm and 13cm bands - DD1US http://www.dd1us.de/Downloads/Low%20Cost%20Chinese%20Directional%20Coupler%20for%2023cm%20and%2013cm%20bands%201v0.pdf |