28may15: recovery attempt

  Taking the data:

  We took data with the xband receiver while attempts were made to wake up the satellite. The setup used was:

• jpl horizon's ephemeris used for tracking the satellite
• Here's how i arrived at the frequency setup used:
• The plan for tone recovery had dsn transmitting:
• start 7188.88600 MHz
• sweep down 13 KHz
• then sweep up 18  KHz
• sweep segments 1000Hz, sweep rate 100Hz/sec
• So they swept over 1khz for 10 secs, giving the satellite a chance to lock
• they then sent the command sequence (assuming it had locked). this took about 628 seconds

• 	freq  range MHz		notes;
  	Min freq	max Freq
  SatUplinkRcv	7188.873000	7188.891000
  SatDwnLinkXmit	8446.205928	8446.227076	880/749 of rcv
  aoRcv	8446.230365	8446.251513	avgdop @ 15:30utc 24437 Hz,blueshifted
  	cfr MHz	bw
  ao Rcv cfr/bw	8446.240939	21148. Hz
  Ao Settings Used	8446.231359	4.0 MHz	4MHz bw, voltage sampling

  
  
• Assumptions:
• they did uplink doppler so 7188873000 Hz is the value rcved by the satellite.
• I took 4 MHz bw voltage. data.The sampling center was about 8khz below the rcv center
• Mock spectrometers;
• 8bit time domain complex  sampling at 4MHz, both pols,  clock set to 160MHz.
  
• used +10MHz offset if2, -10MHz offset mock digital mixer to get rid of dc spike
• pdev  file format, got 17 2Gb files.. about 34 Gbytes of data for the 36 minutes we took data.
  

•  I took 50 KHz bw about 8446.240939 Mhz... just in case..
  
• 2^20 length xform is .25 seconds or 4 Hz resolution
• avg 16 spectra --> 4 seconds of data
• the doppler was moving by about 1Hz/sec, so the signal would smear over 1 4Hz freq bin in 4 seconds.
• We started at  15:12:44 utc  and took data for 2170 seconds.
  
• if the receive signal started at 14:05 utc (email), we then started on step 6.457 . 6Khz below the start freq
  
• 2170 secs is 3.455 628 second intervals. So we ended on interval 9.93.. 9 khz below the start xmit freq.
  

• polA (lcp) .gif
• polB (rcp) .gif    (the xmitted signal was rcp)

• Don't see any signal. I would expect it to be drifting to lower   frequency at about 1hz/second..
  
• the channel width is 4 Hz, the display channel width is 36 Hz (i averaged by 9 channel)
• The vertical is 1 pixel/spectra.
• I also made 17 5KHz bandwidth images  (giving 4Hz display resolution).. still saw nothing.
• The signal should be seen:
• starting at 8446.238590 Mhz
• to            8446.233890 Mhz after 2170 secs (from the 1khz xmiter hops each 628 seconds).
• the start receive time was only quoted to 1 minute...
  
• --> maybe next time...
  

10jun15 stereob recovery attempt

• only took 2Mhz bandwidth data
• topocentric  avg rcv freq: 8446.239778
• dopVel @ transit: -0.69587060 km/sec. 
• dopFrqOffset @ transit: 0.019723861 Mhz (blue shifted).
  
• doppler drift was +3898 to -3898 Hz about the center rcv frequency.
  
• center freq for 2Mhz band: 8446.140000 (wanted to get away from DC, and first lo was only setting to multiples of KHz.
• started taking data:14:52;40 utc . ended at 17:27:00

•  I took 60 KHz bw about 8445.239783 Mhz... just in case..
  
• 2^19 length xform is .25 seconds or 4 Hz resolution
• avg 16 spectra --> 4 seconds of data
• the doppler was moving by about 1Hz/sec, so the signal would smear over 1 4Hz freq bin in 4 seconds.

• polA (lcp) .gif
• polB (rcp) .gif    (the xmitted signal was rcp)

• Don't see any signal. I would expect it to be drifting to lower   frequency at about 1hz/second..
  
• the channel width is 4 Hz, the display channel width is 11 Hz (i averaged by 11 channel)
• The vertical is  3 spectra/pix.. or 12 seconds/pixel. this would smear the 12 hz in the vertical direction.
  
• I also made 11 5KHz bandwidth images, by 1 spectra vertical resolution  (giving 4Hz display resolution).. still saw nothing.