COHERENT BPP POWER REQUIREMENTS
        (not including PC)
 
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     Summary :
     Digital  800 W
     Analog   500 W
     Fan tray 100 W
 
     TOTAL    1400 Watts
      
     I'm a little nervous about stating this total as I
     don't feel as I've thoroughly researched this topic.
 
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     Notes :
     DB
     The sum of the maximum power for each IC is 52.2 Watt (10.5Amps at 
     +5Volts). This value is very conservative  - the actual consumption 
     will be 50 to 80% of this value.  (However the rating increases again
     once the in-efficiency of the power supply is included).
      
     DFB
     Dave Ng told me :
       My guess for the Filter board is 7 amps for +5V and 1 amp for -5V.
      
       Here Dave is just wildly estimating the -5V requirements.
      
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     My lab measurements :
      
     mixer sram length = 128
     harris decimation = 12
     bw = 2.9 MHz
     Harris clock rate = 35.0 MHz

     Running in SSB mode.  This means 1/2 of ADC is off and 4 bits to
     the SRAM are DC.  In DSB these would be in use which might need a
     little more current. As the DB is loading the DFB, 4 bits per DFB 
     channel are not loaded on the BP.  They don't even drive any etch.  
     I think with a FFT board (SERINDIP) you should bump up the current 
     requirements for the DFB to take into account this additional 
     loading. See below.
      
     My numbers :
     1 DB + 1 DFB + TB = 16.6 Amps (1/2 the bits on 1/2 the DFB channels 
        are loaded)
     1 DB + 0 DFB + TB = 10.3 Amps 
                       =  6.3 Amps per DFB
      
     2 DB + 1 DFB + TB = 22.4 Amps (1/2 the bits on all the DFB channels 
        are loaded)
     2 DB + 0 DFB + TB = 15.3 Amps 
                       =  7.1 Amps per DFB
     So for a full coherent crate
     1 TB + 8 * DB + 8 * DFB  = 111.2 Amps
     111.2 amps * 5 volts = 556 Watts
      
     The switching power supply is only 70% efficient so we need 800 
     watts for the digital side of things.

     Analog Power Supplies
     All of them grouped together use a 5 Amp fuse at 120 Volts 
     which means they require less than 600 Watts - call it 500 W.
      
     Fan Tray
     6 fans * 16Watts / fan = 100 Watts
     
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