PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2004-01-15 NOTE = "MGS RST Instrument Health Report HEA4015A.TXT" END_OBJECT = TEXT END Miscellaneous ============= Mars Express has reported interference, apparently coming from MGS uplink ranging modulation. LMA has proposed suspending ranging during the 18-25 January time frame, and possibly beyond. Jesse Glance has requested an impact statement from MGS Radio Science. For more information, see the two e-mails appended to this report. Dale Howell (LMCO) reports the spacecraft fuel and mass status as follows (note that there appears to be a gap, as our previous report was for the period ending 2003/335 - see HEA3335A.TXT): For the period 2003/345 to 2004/003: ----------------------------------- 18.30001 Kg Hydrazine at start (2003/345) 18.20824 Kg Hydrazine Remaining (2004/003) 5.26 kg Hydrazine Unusable 12.9482 kg Usable Hydrazine Remaining 0.09177 kg used over last 23 days. Average daily usage: 3.99 g/day Spacecraft Mass = 674.52 Kg (dry mass) + 5.29 Kg (Ox) + 18.208 Kg (Fuel) = 698.018 Kg (Total Mass) For the period 2004/003 to 2004/004 (including OSM4): ---------------------------------------------------- 18.20824 Kg Hydrazine at start (2004/003) 18.11174 Kg Hydrazine Remaining (2004/004) 5.26 kg Hydrazine Unusable 12.8517 kg Usable Hydrazine Remaining 0.09650 kg used over last 1 day Average daily usage: 96.4977 g/day Spacecraft Mass = 674.52 Kg (dry mass) + 5.29 Kg (Ox) + 18.112 Kg (Fuel) = 697.922 Kg (Total Mass) Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-15T00:00:03.777 Last SCET: 2003-12-15T23:59:59.763 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4110 4369 1.00E+00 1.07E+00 1.04E+00/5.55E-04 2691 F-0195 HGA_EL_ANG -11233 11089 -2.74E+00 2.71E+00 1.11E+00/3.18E-02 2691 L-0034 MOT1_RANGING 0 0 5390 L-0036 MOT1_TLM_MOD 0 0 5390 L-0037 MOT1_USO_ENA 0 0 5390 L-0044 MOT2_RANGING 1 1 5390 L-0046 MOT2_TLM_MOD 0 1 5390 L-0047 MOT2_USO_ENA 1 1 5390 L-0053 RF_SW_OSC 2 2 5390 L-0060 TWTA1_FILMNT 0 0 5390 L-0061 TWTA1_HV 0 0 5390 L-0070 TWTA2_FILMNT 1 1 5390 L-0071 TWTA2_HV 0 1 5390 L-0080 USO_PWR 0 0 5390 L-0090 KaBLE_STAT 0 0 5390 L-0091 KaBLE_ENABLE 1 1 5390 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/8.18E-07 5390 L-0121 MOT2_RCV_AGC 131 255 -1.53E+02 -1.15E+02 -1.46E+02/1.84E-01 5390 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.82E-02/2.29E-05 5390 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.46E-02 674 L-0141 TWTA2_HLX_I 16 43 2.66E-01 8.05E-01 5.27E-01/2.85E-03 5390 L-0142 TWTA2_ANOD_V 0 231 -9.88E+02 -5.26E+02 -6.75E+02/6.22E+00 674 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.35E-04 674 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/4.00E-04 674 T-0302 EPC1_T 167 196 -4.19E+00 7.67E+00 7.90E-01/1.59E-01 674 T-0303 EPC2_T 167 191 -2.00E+00 7.67E+00 1.88E+00/1.25E-01 674 T-0310 RF_ISOLTR1_T 222 233 -6.05E+00 5.98E+00 -4.61E-01/3.80E-02 5390 T-0311 RF_ISOLTR2_T 212 233 -6.05E+00 1.37E+01 3.24E+00/8.88E-02 5390 T-0312 TWT1_T 221 232 -4.77E+00 6.87E+00 7.98E-01/1.11E-01 674 T-0313 TWT2_T 206 233 -6.05E+00 1.73E+01 4.84E+00/3.30E-01 674 T-0315 USO_T 133 136 2.29E+01 2.38E+01 2.33E+01/8.29E-03 674 T-0316 KA_AMP_T 208 219 8.56E+00 1.61E+01 1.17E+01/7.62E-02 673 Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-16T00:00:03.763 Last SCET: 2003-12-16T23:59:59.748 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4102 4372 1.00E+00 1.07E+00 1.01E+00/3.25E-04 2472 F-0195 HGA_EL_ANG -11233 11091 -2.74E+00 2.71E+00 2.20E-01/3.34E-02 2472 L-0034 MOT1_RANGING 0 0 4951 L-0036 MOT1_TLM_MOD 0 0 4952 L-0037 MOT1_USO_ENA 0 0 4951 L-0044 MOT2_RANGING 1 1 4951 L-0046 MOT2_TLM_MOD 0 1 4952 L-0047 MOT2_USO_ENA 1 1 4951 L-0053 RF_SW_OSC 2 2 4952 L-0060 TWTA1_FILMNT 0 0 4951 L-0061 TWTA1_HV 0 0 4951 L-0070 TWTA2_FILMNT 1 1 4951 L-0071 TWTA2_HV 0 1 4951 L-0080 USO_PWR 0 0 4951 L-0090 KaBLE_STAT 0 0 4951 L-0091 KaBLE_ENABLE 1 1 4951 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/7.31E-07 4951 L-0121 MOT2_RCV_AGC 143 255 -1.53E+02 -1.20E+02 -1.48E+02/1.56E-01 4951 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.65E-05 4951 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/9.61E-03 620 L-0141 TWTA2_HLX_I 18 43 3.06E-01 8.05E-01 6.79E-01/2.39E-03 4951 L-0142 TWTA2_ANOD_V 62 231 -8.64E+02 -5.26E+02 -7.93E+02/5.23E+00 620 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.33E-04 619 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/4.16E-04 619 T-0302 EPC1_T 169 196 -4.19E+00 6.87E+00 2.03E+00/1.06E-01 619 T-0303 EPC2_T 169 191 -2.00E+00 6.87E+00 2.88E+00/8.22E-02 619 T-0310 RF_ISOLTR1_T 223 233 -6.05E+00 5.07E+00 -5.36E-01/3.19E-02 4952 T-0311 RF_ISOLTR2_T 214 233 -6.05E+00 1.23E+01 6.01E+00/5.53E-02 4952 T-0312 TWT1_T 222 231 -3.52E+00 5.98E+00 8.09E-01/9.30E-02 619 T-0313 TWT2_T 206 232 -4.77E+00 1.73E+01 9.55E+00/2.11E-01 619 T-0315 USO_T 133 137 2.26E+01 2.38E+01 2.32E+01/9.65E-03 619 T-0316 KA_AMP_T 210 219 8.56E+00 1.50E+01 1.20E+01/5.81E-02 618 Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-17T00:00:03.748 Last SCET: 2003-12-17T23:59:59.734 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4104 4361 1.00E+00 1.06E+00 1.04E+00/8.62E-04 1044 F-0195 HGA_EL_ANG -10069 9365 -2.46E+00 2.29E+00 1.27E+00/4.97E-02 1044 L-0034 MOT1_RANGING 0 0 2086 L-0036 MOT1_TLM_MOD 0 0 2089 L-0037 MOT1_USO_ENA 0 0 2086 L-0044 MOT2_RANGING 1 1 2086 L-0046 MOT2_TLM_MOD 1 1 2089 L-0047 MOT2_USO_ENA 1 1 2086 L-0053 RF_SW_OSC 2 2 2089 L-0060 TWTA1_FILMNT 0 0 2086 L-0061 TWTA1_HV 0 0 2094 L-0070 TWTA2_FILMNT 1 1 2094 L-0071 TWTA2_HV 0 1 2086 L-0080 USO_PWR 0 0 2086 L-0090 KaBLE_STAT 0 0 2086 L-0091 KaBLE_ENABLE 1 1 2094 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/0.00E+00 2086 L-0121 MOT2_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/1.23E-06 2086 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.82E-02/3.55E-05 2086 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.53E-02 259 L-0141 TWTA2_HLX_I 17 43 2.86E-01 8.05E-01 4.84E-01/4.37E-03 2086 L-0142 TWTA2_ANOD_V 64 229 -8.60E+02 -5.30E+02 -6.42E+02/9.50E+00 259 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/4.14E-04 260 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/6.39E-04 260 T-0302 EPC1_T 168 196 -4.19E+00 7.27E+00 -5.74E-01/2.81E-01 261 T-0303 EPC2_T 167 191 -2.00E+00 7.67E+00 1.24E+00/2.39E-01 261 T-0310 RF_ISOLTR1_T 223 233 -6.05E+00 5.07E+00 -1.04E+00/6.99E-02 2089 T-0311 RF_ISOLTR2_T 212 233 -6.05E+00 1.37E+01 1.15E+00/1.57E-01 2089 T-0312 TWT1_T 221 232 -4.77E+00 6.87E+00 4.12E-01/2.15E-01 262 T-0313 TWT2_T 205 233 -6.05E+00 1.78E+01 2.52E+00/5.81E-01 262 T-0315 USO_T 133 137 2.26E+01 2.38E+01 2.33E+01/1.25E-02 261 T-0316 KA_AMP_T 208 219 8.56E+00 1.61E+01 1.13E+01/1.39E-01 260 Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-18T00:00:03.734 Last SCET: 2003-12-18T23:59:59.720 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4093 4361 9.99E-01 1.06E+00 1.01E+00/6.03E-04 1094 F-0195 HGA_EL_ANG -11232 11086 -2.74E+00 2.71E+00 2.83E-01/4.74E-02 1094 L-0034 MOT1_RANGING 0 0 2191 L-0036 MOT1_TLM_MOD 0 0 2190 L-0037 MOT1_USO_ENA 0 0 2191 L-0044 MOT2_RANGING 1 1 2191 L-0046 MOT2_TLM_MOD 0 1 2190 L-0047 MOT2_USO_ENA 1 1 2191 L-0053 RF_SW_OSC 2 2 2190 L-0060 TWTA1_FILMNT 0 0 2191 L-0061 TWTA1_HV 0 0 2192 L-0070 TWTA2_FILMNT 1 1 2192 L-0071 TWTA2_HV 0 1 2191 L-0080 USO_PWR 0 0 2191 L-0090 KaBLE_STAT 0 0 2191 L-0091 KaBLE_ENABLE 1 1 2192 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/0.00E+00 2191 L-0121 MOT2_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/1.23E-06 2191 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.82E-02/3.38E-05 2191 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.45E-02 273 L-0141 TWTA2_HLX_I 18 43 3.06E-01 8.05E-01 6.81E-01/3.54E-03 2191 L-0142 TWTA2_ANOD_V 63 230 -8.62E+02 -5.28E+02 -7.95E+02/7.79E+00 273 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/4.33E-04 273 L-0201 USO_OVEN_V 129 131 2.58E+00 2.62E+00 2.61E+00/6.18E-04 273 T-0302 EPC1_T 174 196 -4.19E+00 4.89E+00 2.72E-01/1.50E-01 273 T-0303 EPC2_T 173 191 -2.00E+00 5.28E+00 1.72E+00/1.08E-01 273 T-0310 RF_ISOLTR1_T 226 233 -6.05E+00 2.12E+00 -2.14E+00/3.51E-02 2190 T-0311 RF_ISOLTR2_T 217 232 -4.77E+00 1.01E+01 3.84E+00/8.38E-02 2190 T-0312 TWT1_T 225 231 -3.52E+00 3.13E+00 -7.42E-01/1.09E-01 273 T-0313 TWT2_T 210 233 -6.05E+00 1.50E+01 7.74E+00/3.33E-01 273 T-0315 USO_T 134 137 2.26E+01 2.35E+01 2.32E+01/1.20E-02 273 T-0316 KA_AMP_T 212 219 8.56E+00 1.37E+01 1.12E+01/7.00E-02 275 Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-19T00:00:03.720 Last SCET: 2003-12-19T23:59:59.706 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4074 4141 9.95E-01 1.01E+00 1.00E+00/4.92E-05 2115 F-0195 HGA_EL_ANG -11233 11089 -2.74E+00 2.71E+00 -8.18E-02/3.36E-02 2115 L-0034 MOT1_RANGING 0 0 4235 L-0036 MOT1_TLM_MOD 0 0 4231 L-0037 MOT1_USO_ENA 0 0 4235 L-0044 MOT2_RANGING 1 1 4235 L-0046 MOT2_TLM_MOD 0 1 4231 L-0047 MOT2_USO_ENA 1 1 4235 L-0053 RF_SW_OSC 2 2 4231 L-0060 TWTA1_FILMNT 0 0 4235 L-0061 TWTA1_HV 0 0 4232 L-0070 TWTA2_FILMNT 1 1 4232 L-0071 TWTA2_HV 0 1 4235 L-0080 USO_PWR 0 0 4235 L-0090 KaBLE_STAT 0 0 4235 L-0091 KaBLE_ENABLE 1 1 4232 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/3.81E-07 4235 L-0121 MOT2_RCV_AGC 130 255 -1.53E+02 -1.15E+02 -1.38E+02/2.38E-01 4235 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.98E-05 4235 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/9.23E-03 528 L-0141 TWTA2_HLX_I 18 43 3.06E-01 8.05E-01 7.25E-01/1.88E-03 4235 L-0142 TWTA2_ANOD_V 63 231 -8.62E+02 -5.26E+02 -8.27E+02/4.16E+00 528 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.57E-04 528 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/4.36E-04 528 T-0302 EPC1_T 167 194 -3.30E+00 7.67E+00 4.25E+00/9.42E-02 527 T-0303 EPC2_T 167 184 9.00E-01 7.67E+00 4.98E+00/7.16E-02 527 T-0310 RF_ISOLTR1_T 222 232 -4.77E+00 5.98E+00 1.70E+00/3.43E-02 4231 T-0311 RF_ISOLTR2_T 213 229 -1.15E+00 1.30E+01 9.08E+00/4.03E-02 4231 T-0312 TWT1_T 221 231 -3.52E+00 6.87E+00 3.06E+00/9.95E-02 527 T-0313 TWT2_T 206 225 3.13E+00 1.73E+01 1.30E+01/1.39E-01 527 T-0315 USO_T 133 137 2.26E+01 2.38E+01 2.31E+01/1.22E-02 527 T-0316 KA_AMP_T 209 218 9.37E+00 1.56E+01 1.33E+01/5.68E-02 531 Engineering Data Statistical Summary from CSV2STAT: First SCET: 2003-12-20T00:00:03.706 Last SCET: 2003-12-20T23:59:59.691 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- F-0190 HGA_AZ_ANG 4079 4368 9.96E-01 1.07E+00 1.02E+00/5.41E-04 2651 F-0195 HGA_EL_ANG -11233 11091 -2.74E+00 2.71E+00 6.40E-01/3.43E-02 2651 L-0034 MOT1_RANGING 0 0 5310 L-0036 MOT1_TLM_MOD 0 0 5311 L-0037 MOT1_USO_ENA 0 0 5310 L-0044 MOT2_RANGING 1 1 5310 L-0046 MOT2_TLM_MOD 0 1 5311 L-0047 MOT2_USO_ENA 1 1 5310 L-0053 RF_SW_OSC 2 2 5311 L-0060 TWTA1_FILMNT 0 0 5310 L-0061 TWTA1_HV 0 0 5311 L-0070 TWTA2_FILMNT 1 1 5311 L-0071 TWTA2_HV 0 1 5310 L-0080 USO_PWR 0 0 5310 L-0090 KaBLE_STAT 0 0 5310 L-0091 KaBLE_ENABLE 1 1 5311 L-0111 MOT1_RCV_AGC 255 255 -1.53E+02 -1.53E+02 -1.53E+02/8.05E-07 5310 L-0121 MOT2_RCV_AGC 143 255 -1.53E+02 -1.20E+02 -1.51E+02/9.72E-02 5310 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/1.75E-05 5310 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/1.39E-02 664 L-0141 TWTA2_HLX_I 17 43 2.86E-01 8.05E-01 6.11E-01/2.77E-03 5310 L-0142 TWTA2_ANOD_V 63 231 -8.62E+02 -5.26E+02 -7.39E+02/6.08E+00 664 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/2.59E-04 664 L-0201 USO_OVEN_V 129 132 2.58E+00 2.64E+00 2.61E+00/3.98E-04 664 T-0302 EPC1_T 167 196 -4.19E+00 7.67E+00 2.66E+00/1.43E-01 664 T-0303 EPC2_T 167 191 -2.00E+00 7.67E+00 3.43E+00/1.23E-01 664 T-0310 RF_ISOLTR1_T 222 233 -6.05E+00 5.98E+00 7.79E-01/4.15E-02 5311 T-0311 RF_ISOLTR2_T 213 233 -6.05E+00 1.30E+01 6.18E+00/7.70E-02 5311 T-0312 TWT1_T 220 232 -4.77E+00 7.73E+00 1.98E+00/1.15E-01 664 T-0313 TWT2_T 206 233 -6.05E+00 1.73E+01 8.66E+00/2.90E-01 664 T-0315 USO_T 133 137 2.26E+01 2.38E+01 2.32E+01/8.95E-03 664 T-0316 KA_AMP_T 209 219 8.56E+00 1.56E+01 1.25E+01/7.63E-02 663 L-0200, L-0201, and T-0315 are nominal. Open Loop Data ============== Data Collection --------------- No new data Closed Loop Data ================ Data Collection --------------- No new data Ancillary Data ============== Data Collection --------------- No new data Appendix ======== More Information on Possible Ranging Termination ------------------------------------------------ From Walter.J.Glance@jpl.nasa.gov Thu Jan 15 17:43:52 2004 Mime-Version: 1.0 X-Sender: jglance@pop.jpl.nasa.gov Message-Id: Date: Thu, 15 Jan 2004 17:45:26 -0800 To: rsimpson@magellan.Stanford.EDU From: Jesse Glance Subject: DOY-017 thru DOY-025 MGS No Ranging Cc: Sami.W.Asmar@jpl.nasa.gov, Aseel.Anabtawi@jpl.nasa.gov Content-Type: text/plain; charset="us-ascii" ; format="flowed" Content-Length: 501 Status: RO Hi Dick, Sami and Aseel got the vmail version of this message earlier today. Due to MEX picking up transmissions to MGS as interference, MGS will not use ranging during mm331 sequence DSS-54 (DOY-017) Pass thru DSS-65 (DOY-025). Also, sometime next week (not yet decided when) MGS commanding power will be reduced to 10kW for both 70m and 34m stations. Please reply back to myself, Gene Brower, Pauline Hwang on the nature of any impacts occur to your science activity. Best Regards, --Jesse - - - - - - From Walter.J.Glance@jpl.nasa.gov Thu Jan 15 18:22:15 2004 Mime-Version: 1.0 X-Sender: jglance@pop.jpl.nasa.gov Message-Id: In-Reply-To: <200401160150.i0G1oxx21161@magellan.Stanford.EDU> References: <200401160150.i0G1oxx21161@magellan.Stanford.EDU> Date: Thu, 15 Jan 2004 18:23:50 -0800 To: Dick Simpson 650-723-3525 From: Jesse Glance Subject: Re: DOY-017 thru DOY-025 MGS No Ranging Content-Type: text/plain; charset="us-ascii" ; format="flowed" Content-Length: 3870 Hi Dick, Yes, modulation. I wasn't in the original coord. loop on this. Seems like there's a little experimentation going on. The upcoming activities should also determine whether ranging can be applied at a lower transmit power (without being detrimental to MEX). Pauline just forwarded me Bill Adam's earlier email ... >Date: Thu, 15 Jan 2004 15:19:52 -0700 >From: "Adams, William R" >Subject: MGS Uplink Interfering with MEX Receiver >To: "Thorpe, Tom E (X-JPL)" , > "Gene Brower (E-mail)" , > "Odiorne, Stephen C" , > "Espitallier, Dean S" , > "Pauline P Hwang (E-mail)" , > "Bezjak, Kelly J (N-Red Canyon Software)" , > "Freund, Sandra" , > "Lewis, Jeff A" , > "MPSETB (E-mail)" >Cc: Miles.K.Sue@jpl.nasa.gov, > "Toro-Allen, Scott L" , > "Delk, John" >Thread-topic: MGS Uplink Interfering with MEX Receiver >Thread-index: AcPbtbFXkNCskHRnRsSrt9w9ucrHMQ== >X-OriginalArrivalTime: 15 Jan 2004 22:19:52.0931 (UTC) > FILETIME=[B2A64330:01C3DBB5] > >All, > >The MGS uplink signal has been determined to interfere with the MEX >receiver. It is most likely that the majority of interference is >coming from the ranging signal, since the MEX center frequency is >several Megahertz higher than the MGS uplink. I am writing an MCR to >propose two changes to MGS uplink management that should help with >this problem. We should try these measures separately first, to >determine which one is more effective, and then combine them if >needed afterwards. > >1) Stop uplinking a ranging signal. This may eliminate all >interference, but it is an impact to the groups that are still using >MGS ranging data. I propose that we stop ranging for a week starting >on Sunday January 18, and query the MEX project as to the result. > >2) Lower uplink power. We are currently operating with a fair amount >of margin on the uplink, especially when a 70m station is used. >After the week of no ranging is over, I propose we implement a >reduction in uplink power from 20 KW to 10 KW. This can be done for >a trial period, length to be determined. We should be able to use >this until May when using 34m stations, and forever on 70m stations. >If we decide that lowering MGS uplink power is essential to avoid >interference, we will need to start managing the uplink power >several times per year, since we have to use 20 KW at 34m stations >when we're at max range. > >NOPE's: Please put out direction to the stations to stop ranging on >MGS from January 18 to January 25. If possible we will try and get >an updated SOE out that reflects no ranging during these passes. > >ACE's: No ranging for MGS from January 18-25. Please inform stations >at pre-cal, when you are on console. > >MPST: I will create an SASF to suppress ranging in the DKFs during >this period. This will require a new MM331 dkf, sorry about that... > > >Thanks for your support! Hopefully we'll find a relatively painless >way to stop interfering with MEX. > >Bill Adams >MSOP Telecom >303-977-6389 ------- > >Due to MEX picking up transmissions to MGS as interference, MGS will >>not use ranging during mm331 sequence DSS-54 (DOY-017) Pass thru > >DSS-65 (DOY-025). > > So is it the ranging MODULATION that is causing the interference? > If it's the uplink signal in general, I don't see how turning off > ranging would make much difference. -- (Walter J. Glance, Jr.) MGS Payload Engineering & UHF Relay Email: Walter.J.Glance@jpl.nasa.gov URGENT: (Cell) 818.421.7957 ,(Pgr) 800.759.8888 PIN 1192339 / 1192339@skytel.com Desk: 505.898.2478