• The cafeteria has (as of 31mar13) a hypercom T4205 ivu loto machine. It has a keypad for the info to be entered manually. Its emissions are described on another page.
  

15oct12: softek ivu loto emissions in the screen room:

   Luis measured the emissions of the softek ivuloto device in the screen room on 15oct12.

Luis' setup and results (.pdf)

The setup was:

• Agilent E4445A spectrum analyzer:
• average 20 sweeps
• 8192 points/spectra
• 6db attenuation , preamp on
• 100 MHz span, 12.5 Khz/rbw. covering 0 to 3000 MHz in 30 spectra
• 904 Efield probe with a 15 foot coax cable.
  

    There were two ivu loto devices (called 1 and 2). For each device, Luis measured a complete set of spectra at two positions.

• Box closed measurement positions:
• Pos 1: Back side of the box close to the TxPort  device.
• Pos 2: At the front panel close to the network connection
• Box open measurement positions:
• Pos 1: on top of power supply
• Pos 2: on top of the softek TxPort (see pictures in luis' description)

The plots:

    The plots show the emissions from the devices.

• The first page shows plots of 0-1000 MHz, 1000-2000MHz and 2000-3000MHz
• The 2nd page shows some blowups around some of our receiver bands:
• 300-500 MHz (327,430)
• 1150-1750 MHz (lbw)
• 2000-3000 MHz (lbw)
  

• Box Open device 1:
  
•  position 1 (power supply)(.ps) (.pdf)
  
• position 2 (on top of TxPort device)(.ps) (.pdf)
  
• There is 25 MHz comb (red dotted line page 2)
• 125MHz components of the comb are strong above 1 Ghz (dashed green line page 2)
  
• Strongest birdies seen in position 2 (on top of txPort device).
  
• 225,625,1625,1750,2225
• Box Closed:
• Device 1:
• position 1 (back side of box) (.ps) (.pdf)
• The 1750 birdie is getting through (-101 dbm)
• position 2 (at network connector (.ps) (.pdf)
• The 1750 and 1800 MHz birdies are seen (-99 dbm).
• Device 2:
• position 1 (back side of box) (.ps) (.pdf)
• No birdies stick out in our receiver bands.
  
• position 2 (at network connector (.ps) (.pdf)
• There may be something at 332 MHz.
  

Summary:

• The device has  a 25 MHz comb starting around 200 MHz going op to 3Ghz.
• Above 1 Ghz, a 125 MHz component of this comb is the strongest.
• With the shielding in place
• birdies are seen at 1750 and 1800 MHz ath the -100 dbm level.
• Some questions about the test:
• I'm a little surprised that the strongest position with the box closed wasn't the power cord. The AC filter does not work very well above 30 MHz
• Was the device transmitting over the network when the test was done? Does this increase the emissions?
• The device at the visitor center hotdog stand probably needs to be checked on the telescope:
• first find the peak az,za by transmitting a birdie for the location.
• The turn the device on and let it communicate, the turn it off. Repeat this sequence.
  

processing: x101/rfi/miscdevice/ivuloto_softek_121015/doivuloto.pro

---