TBAD

Data Logs

Engineering Notes

May 13, 2016

  • To test the option of using one side for early warning, the following was done to the system:
    • Julian Z. connected the shutter output of DX to the unused Digital Input of the Satellite Avoidance module in the SX LLP cabinet, and a fixed 5 V level to the DX TBAD input of the Interlock system. With this change, only the SX TBAD will trigger a propagation shutter closure.
    • Gustavo increased the Beam Threshold (BT) on the DX Discriminator box from 0.45 V (~12 deg) to 0.35 V (~14.5 deg). The full range of adjustment is 1V -> 0V: 0 deg -> 25 deg (2.5 deg/100 mV).

May 14, 2016

  • Results from the previous night (2016-05-14 UT):

sx_20160514_xp.log

Closure #1 02:59:43.649 03:00:11.792 28 117.64 68.10

Closure #2 05:13:12.915 05:13:33.081 20 157.58 90.00

Closure #3 05:49:29.416 05:49:58.163 28 243.72 67.17

Closure #4 06:18:10.439 06:18:24.329 13 252.24 61.60

dx_20160514_xp.log

Closure #1 02:59:45.359 03:00:18.463 33 117.68 68.12

Closure #2 05:13:11.863 05:13:37.531 25 157.58 90.00

Closure #3 05:49:26.530 05:50:00.851 34 243.74 67.16

Closure #4 06:18:03.838 06:18:27.849 24 252.26 61.59
  • For Closure #1, DX was triggered 1.7 seconds after SX. Early warning feature failed.
  • DX worked as early warning for Closures #2 (1.05 sec), #3 (2.89 sec), and #4 (6.6 sec).

May 15, 2016

  • Checking the physical mount of the antennas we found out that they were slightly misaligned. Julian Z. added some shimming to improve alignment, which should result in a better matching of the directional beams.

May 15, 2016

  • Tom Murphy site visit. Both sides were adjusted to be the same, as follows:

SX:

OS 0.85 \x97> 1.00

OT 1.40

DC 1.80

DS 0.85 \x97> 1.00

DT = 1.30

BT = 0.45 \x97> 0.40

window 2.55 k-ohm \x97> 3.5 k-ohm

40 ns delay

100 ns lookback jumper removed (allows DME as Beam signals)

DX:

OS 0.85 \x97> 1.00

OT 1.40

DC 1.80

DS 0.85 \x97> 1.00

DT = 1.30

BT = 0.35 \x97> 0.40

window 2.5 k-ohm \x97> 3.49 k-ohm

40 ns delay

100 ns lookback jumper removed (allows DME as Beam signals)

  • Also measured the following:

199 inches floor to TSIM antenna, SX

216 inches floor to SX TBAD antenna center

244 inches horizontal between antennas

-- %USERSIG{GustavoRahmer - 2015-10-17}%

Comments

 
Topic revision: r7 - 19 Sep 2016, GustavoRahmer
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