AJ4CO Observatory

Antenna Test Range

FREQ: See Receiver Antenna Log

ANTENNA 1: Reference 1/2-wave dipole

ANTENNA 2: Antenna under test

CONFIGURATION:
Feeds from antennas 1 & 2
     |
     V
Auto Calibrator
     |
     V
HAT-3 (3 db pad) 1 & 2
     |
     V
16 dB preamp 1 & 2
     |
     V
Icom R75 1 & 2
USB
Wide Filter ON
NB OFF
AGC OFF
PA2 ON
RF Gain preset during calibration procedure
     |
     V
Rocketfish RF51-SDCD sound card
12 kHz sampling, 16-bit, stereo
Line In stereo left (tip) and stereo right (ring)
Windows Mixer recording level set to 100%
     |
     V
RSP 2.1.17 on RA3 PC (WinXP SP3)
RSP Average detection method

DATA:
Channel 1 - Reference antenna - northern Jove array dipole - raw data (100 ms average of sound card data - 1200 ADC samples - stereo left - R75 #1)

Channel 2 - Antenna under test - southern Jove array dipole - raw data (100 ms average of sound card data - 1200 ADC samples - stereo right - R75 #2)

Channel 3 - Calibrated feed point temperature, reference dipole, VALID RANGE: 5 to 150 kK

Channel 4 - Calibrated feed point temperature, antenna under test, VALID RANGE: 5 to 150 kK

Channel 5 - Median smoothed value of 5 previous samples from channel 3, reference dipole

Channel 6 - Median smoothed value of 5 previous samples from channel 4, antenna under test

Channel 7 - Difference in terms of dB of channel 6 (antenna under test) with respect to channel 5 (reference dipole)

Channel 8 - Five-second average (50 previous samples) of channel 7 (dB difference between antenna under test and reference dipole)

PUBLISH INFO[see notes]