| Commercial 2300-2400 MHz band-pass filter retuned for QO-100uplinkat 2400-2410 MHz - DD1US |
| Commercial 2300-2400 MHz band-pass filter retuned for QO-100uplinkat 2400-2410 MHz - DD1US http://www.dd1us.de/Downloads/Retuning%20S-Band%20filter%202300-2400%20MHz%20for%20the%20QO-100%20uplink%20rev1.pdf |