The 121.75 MHz band pass filter
Abstract
Prior to the ASTP joint flight it was observed during various tests on the USA's VHF/FM system, that the 121.75 MHz receiver unsquelched when exposed to certain RF power levels at a frequency of 142.417 MHz. Tests were conducted in an effort to arrive at a solution. Several recommendations were made but the most feasible was to insert a selective band pass filter in the transmit/receiver line of the VHF/FM transceiver. The tests were performed on the filter to determine the frequency response and rejection capabilities at 142.417 MHz.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1975
- Bibcode:
- 1975STIN...7611349D
- Keywords:
-
- Apollo Soyuz Test Project;
- Bandpass Filters;
- Performance Tests;
- Frequency Modulation;
- Graphs (Charts);
- Transmitter Receivers;
- Very High Frequencies;
- Electronics and Electrical Engineering