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NASA-LLIS-0395
Lessons Learned - In-Flight Spacecraft Antenna Gain and Polarization Changes
Year: 1995
Abstract: Abstract:
Before the first Mercury encounter, the MVM'73 high gain antenna suddenly lost 3 dB in gain and changed from circular to linear in polarization. It was suspected that either particles or chips left in the S-band feed cavity after antenna assembly caused a short circuit, or a combination of tolerance build-up and thermal effects caused a dimensional change. Worst case analysis should be preformed on any equipment suspected to be sensitive to assembly practices or tolerance build-up.
Before the first Mercury encounter, the MVM'73 high gain antenna suddenly lost 3 dB in gain and changed from circular to linear in polarization. It was suspected that either particles or chips left in the S-band feed cavity after antenna assembly caused a short circuit, or a combination of tolerance build-up and thermal effects caused a dimensional change. Worst case analysis should be preformed on any equipment suspected to be sensitive to assembly practices or tolerance build-up.
Subject: Administration/Organization
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:07:25Z | |
| date available | 2017-09-04T16:07:25Z | |
| date copyright | 06/06/1995 | |
| date issued | 1995 | |
| identifier other | BIBEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/70557 | |
| description abstract | Abstract: Before the first Mercury encounter, the MVM'73 high gain antenna suddenly lost 3 dB in gain and changed from circular to linear in polarization. It was suspected that either particles or chips left in the S-band feed cavity after antenna assembly caused a short circuit, or a combination of tolerance build-up and thermal effects caused a dimensional change. Worst case analysis should be preformed on any equipment suspected to be sensitive to assembly practices or tolerance build-up. | |
| language | English | |
| title | NASA-LLIS-0395 | num |
| title | Lessons Learned - In-Flight Spacecraft Antenna Gain and Polarization Changes | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1995 | |
| contenttype | fulltext | |
| subject keywords | Administration/Organization | |
| subject keywords | Operations | |
| subject keywords | Spacecraft |