COVER INFORMATION Station: JODRELL2 (Code Jb ) Experiment: DBBC firmware test: E-series portion (v105E, v106E) Exp. Code: FR048E Schedule Version: 2.00 Processed by SCHED version: 11.40 Release 11.4. March 14, 2015 PI: campbell Address: JIVE Phone: 0521-596-534 EMAIL: campbell@jive.eu Fax: Phone during observation: Observing mode: Notes: Schedule for JODRELL2 (Code Jb ) Page 2 DBBC firmware test: E-series portion (v105E, v106E) UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 7 May 2018 Day 127 --- ---------- v105E firmware section ---------- Next scan frequencies: 4830.49 4830.49 4830.49 4830.49 4894.49 4894.49 4894.49 4894.49 4958.49 4958.49 4958.49 4958.49 5022.49 5022.49 5022.49 5022.49 Next BBC frequencies: 130.49 130.49 130.49 130.49 194.49 194.49 194.49 194.49 258.49 258.49 258.49 258.49 322.49 322.49 322.49 322.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 08 00 00 0234+285 22 51 16 42.3 97.3 -3.8 -42.7 0 0 08 00 00 08 03 00 --- 22 54 16 42.7 97.9 -3.7 -42.6 180 46 08 00 01 08 06 00 0234+285 22 57 17 43.2 98.6 -3.7 -42.5 175 46 08 06 00 08 09 00 --- 23 00 17 43.6 99.3 -3.6 -42.4 180 93 08 06 01 08 12 00 0234+285 23 03 18 44.1 100.0 -3.6 -42.3 175 93 08 12 00 08 15 00 --- 23 06 18 44.5 100.6 -3.5 -42.2 180 139 08 12 01 08 18 00 0234+285 23 09 19 45.0 101.3 -3.5 -42.1 174 139 08 18 00 08 21 00 --- 23 12 19 45.4 102.0 -3.4 -42.0 180 185 08 18 01 08 24 00 0234+285 23 15 20 45.8 102.7 -3.4 -41.8 174 185 08 24 00 08 27 00 --- 23 18 20 46.3 103.4 -3.3 -41.7 180 232 08 24 01 08 30 00 0234+285 23 21 21 46.7 104.1 -3.3 -41.5 174 232 08 30 00 08 33 00 --- 23 24 21 47.2 104.9 -3.2 -41.4 180 278 08 30 01 Next scan frequencies: 4942.49 4942.49 4942.49 4942.49 4974.49 4974.49 4974.49 4974.49 5006.49 5006.49 5006.49 5006.49 5038.49 5038.49 5038.49 5038.49 Next BBC frequencies: 242.49 242.49 242.49 242.49 274.49 274.49 274.49 274.49 306.49 306.49 306.49 306.49 338.49 338.49 338.49 338.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 08 38 00 0234+285 23 29 22 47.9 106.1 -3.2 -41.1 294 278 08 38 00 08 41 00 --- 23 32 22 48.3 106.8 -3.1 -40.9 180 301 08 38 25 Schedule for JODRELL2 (Code Jb ) Page 3 DBBC firmware test: E-series portion (v105E, v106E) UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 7 May 2018 Day 127 --- Next scan frequencies: 4934.49 4934.49 4934.49 4934.49 4950.49 4950.49 4950.49 4950.49 4966.49 4966.49 4966.49 4966.49 4982.49 4982.49 4982.49 4982.49 Next BBC frequencies: 234.49 234.49 234.49 234.49 250.49 250.49 250.49 250.49 266.49 266.49 266.49 266.49 282.49 282.49 282.49 282.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 08 46 00 0234+285 23 37 23 49.0 108.1 -3.0 -40.5 294 301 08 46 00 08 49 00 --- 23 40 24 49.5 108.9 -3.0 -40.3 180 313 08 46 25 Next scan frequencies: 4930.49 4930.49 4930.49 4930.49 4938.49 4938.49 4938.49 4938.49 4946.49 4946.49 4946.49 4946.49 4954.49 4954.49 4954.49 4954.49 Next BBC frequencies: 230.49 230.49 230.49 230.49 238.49 238.49 238.49 238.49 246.49 246.49 246.49 246.49 254.49 254.49 254.49 254.49 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 08 54 00 0234+285 23 45 25 50.2 110.2 -2.9 -39.9 294 313 08 54 00 08 57 00 --- 23 48 25 50.6 111.0 -2.8 -39.7 180 319 08 54 25 ---------- last scan of the v105E section; shift to v106E after this one ---------- Next scan frequencies: 4928.49 4928.49 4928.49 4928.49 4932.49 4932.49 4932.49 4932.49 4936.49 4936.49 4936.49 4936.49 4940.49 4940.49 4940.49 4940.49 Next BBC frequencies: 228.49 228.49 228.49 228.49 232.49 232.49 232.49 232.49 236.49 236.49 236.49 236.49 240.49 240.49 240.49 240.49 Next scan bandwidths: 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 09 02 00 0234+285 23 53 26 51.3 112.3 -2.8 -39.2 293 319 09 02 00 09 05 00 --- 23 56 26 51.7 113.1 -2.7 -39.0 180 322 09 02 25 ---------- v106E firmware section (20-min gap provided) ---------- Next scan frequencies: 4830.49 4830.49 4830.49 4830.49 4894.49 4894.49 4894.49 4894.49 4958.49 4958.49 4958.49 4958.49 5022.49 5022.49 5022.49 5022.49 Next BBC frequencies: 130.49 130.49 130.49 130.49 194.49 194.49 194.49 194.49 258.49 258.49 258.49 258.49 322.49 322.49 322.49 322.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 09 25 00 0234+285 00 16 30 54.4 118.9 -2.4 -36.8 1191 322 09 25 00 09 28 00 --- 00 19 30 54.8 119.8 -2.3 -36.4 180 368 09 25 25 09 31 00 0234+285 00 22 31 55.2 120.7 -2.3 -36.0 174 368 09 31 00 09 34 00 --- 00 25 31 55.6 121.7 -2.2 -35.6 180 414 09 31 01 09 37 00 0234+285 00 28 32 55.9 122.6 -2.2 -35.2 173 414 09 37 00 09 40 00 --- 00 31 32 56.3 123.6 -2.1 -34.7 180 461 09 37 01 Schedule for JODRELL2 (Code Jb ) Page 4 DBBC firmware test: E-series portion (v105E, v106E) UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 7 May 2018 Day 127 --- 09 43 00 0234+285 00 34 33 56.7 124.6 -2.1 -34.3 173 461 09 43 00 09 46 00 --- 00 37 33 57.1 125.6 -2.0 -33.8 180 507 09 43 01 09 49 00 0234+285 00 40 34 57.4 126.6 -2.0 -33.3 173 507 09 49 00 09 52 00 --- 00 43 34 57.8 127.6 -1.9 -32.8 180 554 09 49 01 09 55 00 0234+285 00 46 35 58.1 128.7 -1.9 -32.3 173 554 09 55 00 09 58 00 --- 00 49 35 58.5 129.7 -1.8 -31.7 180 600 09 55 01 Next scan frequencies: 4942.49 4942.49 4942.49 4942.49 4974.49 4974.49 4974.49 4974.49 5006.49 5006.49 5006.49 5006.49 5038.49 5038.49 5038.49 5038.49 Next BBC frequencies: 242.49 242.49 242.49 242.49 274.49 274.49 274.49 274.49 306.49 306.49 306.49 306.49 338.49 338.49 338.49 338.49 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 10 03 00 0234+285 00 54 36 59.1 131.5 -1.7 -30.8 292 600 10 03 00 10 06 00 --- 00 57 36 59.4 132.6 -1.7 -30.2 180 623 10 03 25 Next scan frequencies: 4934.49 4934.49 4934.49 4934.49 4950.49 4950.49 4950.49 4950.49 4966.49 4966.49 4966.49 4966.49 4982.49 4982.49 4982.49 4982.49 Next BBC frequencies: 234.49 234.49 234.49 234.49 250.49 250.49 250.49 250.49 266.49 266.49 266.49 266.49 282.49 282.49 282.49 282.49 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 10 11 00 0234+285 01 02 37 59.9 134.5 -1.6 -29.2 292 623 10 11 00 10 14 00 --- 01 05 38 60.2 135.7 -1.6 -28.5 180 635 10 11 25 Next scan frequencies: 4930.49 4930.49 4930.49 4930.49 4938.49 4938.49 4938.49 4938.49 4946.49 4946.49 4946.49 4946.49 4954.49 4954.49 4954.49 4954.49 Next BBC frequencies: 230.49 230.49 230.49 230.49 238.49 238.49 238.49 238.49 246.49 246.49 246.49 246.49 254.49 254.49 254.49 254.49 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 10 19 00 0234+285 01 10 39 60.8 137.7 -1.5 -27.4 292 635 10 19 00 10 22 00 --- 01 13 39 61.1 138.9 -1.4 -26.7 180 641 10 19 25 Schedule for JODRELL2 (Code Jb ) Page 5 DBBC firmware test: E-series portion (v105E, v106E) UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Mon 7 May 2018 Day 127 --- ---------- last scan of the v106E section; start FR048N after this (v106 firmware) ---------- Next scan frequencies: 4928.49 4928.49 4928.49 4928.49 4932.49 4932.49 4932.49 4932.49 4936.49 4936.49 4936.49 4936.49 4940.49 4940.49 4940.49 4940.49 Next BBC frequencies: 228.49 228.49 228.49 228.49 232.49 232.49 232.49 232.49 236.49 236.49 236.49 236.49 240.49 240.49 240.49 240.49 Next scan bandwidths: 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 10 27 00 0234+285 01 18 40 61.5 140.9 -1.3 -25.5 292 641 10 27 00 10 30 00 --- 01 21 40 61.8 142.2 -1.3 -24.8 180 643 10 27 25 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess218.Cfilt32e --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 3 Station: JODRELL2 Total bit rate: 2048 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 1 Setup file default. Used with PCAL = off LO sum= 4830.49 4830.49 4830.49 4830.49 4894.49 4894.49 4894.49 4894.49 4958.49 4958.49 4958.49 4958.49 5022.49 5022.49 5022.49 5022.49 BBC fr= 130.49 130.49 130.49 130.49 194.49 194.49 194.49 194.49 258.49 258.49 258.49 258.49 322.49 322.49 322.49 322.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 1 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off ======== Setup file: sess218.Cfilt16e --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 11 Station: JODRELL2 Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 32.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 9 Setup file default. Used with PCAL = off LO sum= 4942.49 4942.49 4942.49 4942.49 4974.49 4974.49 4974.49 4974.49 5006.49 5006.49 5006.49 5006.49 5038.49 5038.49 5038.49 5038.49 BBC fr= 242.49 242.49 242.49 242.49 274.49 274.49 274.49 274.49 306.49 306.49 306.49 306.49 338.49 338.49 338.49 338.49 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 Matching frequency sets: 9 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off ======== Setup file: sess218.Cfilt8e --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 19 Station: JODRELL2 Total bit rate: 512 Format: VDIF Bits per sample: 2 Sample rate: 16.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 17 Setup file default. Used with PCAL = off LO sum= 4934.49 4934.49 4934.49 4934.49 4950.49 4950.49 4950.49 4950.49 4966.49 4966.49 4966.49 4966.49 4982.49 4982.49 4982.49 4982.49 BBC fr= 234.49 234.49 234.49 234.49 250.49 250.49 250.49 250.49 266.49 266.49 266.49 266.49 282.49 282.49 282.49 282.49 Bandwd= 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 Matching frequency sets: 17 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off ======== Setup file: sess218.Cfilt4e --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 27 Station: JODRELL2 Total bit rate: 256 Format: VDIF Bits per sample: 2 Sample rate: 8.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 25 Setup file default. Used with PCAL = off LO sum= 4930.49 4930.49 4930.49 4930.49 4938.49 4938.49 4938.49 4938.49 4946.49 4946.49 4946.49 4946.49 4954.49 4954.49 4954.49 4954.49 BBC fr= 230.49 230.49 230.49 230.49 238.49 238.49 238.49 238.49 246.49 246.49 246.49 246.49 254.49 254.49 254.49 254.49 Bandwd= 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 Matching frequency sets: 25 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off ======== Setup file: sess218.Cfilt2e --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 35 Station: JODRELL2 Total bit rate: 128 Format: VDIF Bits per sample: 2 Sample rate: 4.000 Number of channels: 16 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 4700.00 Net SB= L L U U L L U U L L U U L L U U IF SB = U U U U U U U U U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 3 11 3 11 5 13 5 13 7 15 7 15 BBC SB= L L U U L L U U L L U U L L U U IF = A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 The following frequency sets based on these setups were used. Frequency Set: 33 Setup file default. Used with PCAL = off LO sum= 4928.49 4928.49 4928.49 4928.49 4932.49 4932.49 4932.49 4932.49 4936.49 4936.49 4936.49 4936.49 4940.49 4940.49 4940.49 4940.49 BBC fr= 228.49 228.49 228.49 228.49 232.49 232.49 232.49 232.49 236.49 236.49 236.49 236.49 240.49 240.49 240.49 240.49 Bandwd= 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 Matching frequency sets: 33 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * 0234+285 02 34 55.589590 * 02 37 52.405677 02 38 55.107199 0.00 J0237+2848 28 35 11.40776 * 28 48 08.99001 28 52 37.72238 0.00 J0237+28 /home/guest/rmc/SCHED/sched11.4/catalogs/sources.gsfc GSFC 2015a astro solution, unpublished 54650 observations. SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline 0234+285 sess218.Cfilt32e 1 2 3 4 5 7 0.600 16.800 sess218.Cfilt16e 9 10 11 12 13 15 0.100 2.800 sess218.Cfilt8e 17 18 19 20 21 23 0.100 2.800 sess218.Cfilt4e 25 26 27 28 29 31 0.100 2.800 sess218.Cfilt2e 33 34 35 36 37 39 0.100 2.800 EFFECT OF SOLAR CORONA The solar corona can cause unstable phases for sources too close to the Sun. SCHED provides warnings at individual scans for distances less than 10 degrees. The distance from the Sun to each source in this schedule is: Source Sun distance (deg) 0234+285 12.7 Barry Clark estimates from predictions by Ketan Desai of IPM scattering sizes that the Sun will cause amplitude reductions on the longest VLBA baselines at a solar distance of 60deg F^(-0.6) where F is in GHz. For common VLBI bands, this is: 327 MHz 117. deg 610 MHz 81. deg 1.6 GHz 45. deg 2.3 GHz 36. deg 5.0 GHz 23. deg 8.4 GHz 17. deg 15.0 GHz 12. deg 22.0 GHz 9. deg 43.0 GHz 6. deg