| UHF bandpass filter retuned as RX IF filter for the QO-100 satellite - DD1US |
| UHF bandpass filter retuned as RX IF filter for the QO-100 satellite - DD1US http://www.dd1us.de/Downloads/745%20MHz%20bandpass%20filter%20Blonder%20Tongue%20Labs%20retuned%20rev1.pdf |