| Evaluation of low-cost Chinese directional couplers 800-2500 MHz for the 23cm and 13cm bands - DD1US Update: 12.01.2020 |
| Evaluation of low-cost Chinese directional couplers 800-2500 MHz for the 23cm and 13cm bands - DD1US http://www.dd1us.de/Downloads/Low%20Cost%20Chinese%20Directional%20Couplers%20800-2500%20MHz%20for%20the%2023cm%20and%2013cm%20bands%201v1.pdf |