AJ4CO Observatory

See link for station diagram and calibration temperatures:
http://www.radiojove.org/SUG/#diags

Antenna:
Radio Jove dual-dipole array at 12 feet, zenith beam,
reflector wire 7'6" below dipole wires.
Beam steering: zenith
50 ohm feed system
Mini-Curcuits ZSC-2-1 power combiner
RG-58, LMR-240, and LMR-400 feed
Loss from element feed points to rcvr input: 3.2 dB.
    
Receiver:
R8500 tuned to 20.100MHz
2.5 VDC shoved into the AGC output port to defeat the AGC
R8500 IF output into 10.7 MHz xtal-tuned RJ rcvr
    
Recording equipment:
Radio-SkyPipe (RSP) v2.1.17
Rocketfish RF-51SDCD sound card
WinXP Pro SP3

RSP configuration:
Audio sample rate, depth: 12 kHz, 16-bit
RSP sample period: 100 milliseconds (10 Hz)
Averaging over: 1 RSP sample (1,200 sound card samples)
Channel 1: sound card left, average detection method, averaged raw sound card data
Channel 2: calibrated antenna temperature

Amplitude Calibration:
Cal Plane: Receiver input (R8500)
Noise Gen: AJ4CO Auto Calibrator
NOTE: noise gen measured at 500 MK± 0.1 dB 20 May 2018

Two step cals daily
During Jupiter observing season (elongation +60° to +180° and -180° to -90°): ±4.5 hours from Jupiter transit
During off-season for Jupiter (elongation +60° to -90°): ±3 hours from Jupiter transit
NOTE: as of 28 Oct 2017, step cals are only enabled on weekends to avoid saturating the QDC with too many Jupiter step cals (takes 12 years for Jupiter transit to cycle through 24 hours in LMST).
Calibrations performed on:
07 Apr 2018
19 Nov 2017
13 Dec 2017
18 Jan 2018


Calibration equation: 07 Jul 2017 1250 UTC (ACTIVE)
CH 1: raw sound card samples
CH 2: calibrated antenna temperature
A=0.00012758*(Z1^2.0478528);B=log10(A);C=-0.0119*B^6+0.0851*B^5+0.3012*B^4-4.5832*B^3+16.579*B^2-25.3*B+13.959;A*(10^(-C/10))*(10^0.01)

Calibration equation: 06 Jul 2017 1439 UTC (superceded)
CH 1: cal wizard calibration
Offset:0
PDF: 8710.47028991492

Calibration equation: 06 Jul 2017 1410 UTC (superceded)
CH 1: Set pwr detection factor to 1 to run raw data step cal

Calibration equation: 05 Jul 2017 1448 UTC (superceded)
CH 1: cal wizard calibration
Offset:0
PDF: 8710.47028991492

Calibration equation: 04 Jul 2017 1640 UTC (superceded)
CH 1: raw sound card samples
CH 2: calibrated antenna temperature
A=0.00012758*(Z1^2.0478528);B=log10(A);C=-0.0119*B^6+0.0851*B^5+0.3012*B^4-4.5832*B^3+16.579*B^2-25.3*B+13.959;A*(10^(-C/10))*(10^0.01)

Calibration equation: 01 Jul 2017 1930 UTC (superceded)
A=0.00012758*(X^2.0478528);B=log10(A);C=-0.0119*B^6+0.0851*B^5+0.3012*B^4-4.5832*B^3+16.579*B^2-25.3*B+13.959;A*(10^(-C/10))*(10^0.005)

Calibration equation: 01 Jul 2017 (superceded)
A=0.00012758*(X^2.0478528);B=log10(A);C=-0.0119*B^6+0.0851*B^5+0.3012*B^4-4.5832*B^3+16.579*B^2-25.3*B+13.959;A*10^(-C/10)*10^0.01

Calibration equation: 29 Jun 2017 (superceded)
A=0.00012758*(X^2.0478528);B=log10(A);C=-0.0119*B^6+0.0851*B^5+0.3012*B^4-4.5832*B^3+16.579*B^2-25.3*B+13.959;A*10^(-C/10)

Calibration equation: 28 Jun 2017 (superceded)
0.00012758*X^2.0478528

Calibration equation: 12 Jan 2017 (superceded)
0.00014065*X^2.055768






PUBLISH INFO[20 MHz zenith beam linear polarization]