Three new SDRs in the shack

[K3WRY at aol.com]

Food for thought-------  
The  size of an audio file is determined by three factors: sampling rate, 
bit  resolution and channel count. 
Let's  take an example audio file which was recorded at 44.1kHz, mono, and 
16 bit  resolution. The bit rate for this file is calculated as: 44100 x 1 x 
16 =  705,600 bits per second. Divide that 705,600 by 8 and you've got 
88,200 bytes  per second. Divide that 88,200 by 1024 and you end up with 86 
kilobytes per  second. Multiple that by 60 and you get 5167 kilobytes per 
MINUTE. Or 5.047 MB  per minute. 
The audio with more activity I would expect to require more  MB.
 
73's
Dr Joseph Palsa k3wry
ARRL-Virginia Section Manager
Virginia  State Government Liaison
K3WRY at ARRL.ORG
804-350-2665

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In a message dated 5/30/2017 12:54:22 P.M. Eastern Daylight Time,  
beatnic at comcast.net writes:

I was thinking this morn, probably the  coffee.  
So if you record to disk I would think that if you captured  a portion of 
the spectrum with many stations that the file size would be  greater than a 
less busy part of the spectrum.   Is that true? Then I  thought if you 
recorded a part of the spectrum with noise at a certain level  and then recorded 
another part of the spectrum with a higher noise level, then  would the 2 
files sizes be the same or different? I'm ignoring OS  overhead.
I'm sure there is a mathematical explanation for this and if need  be I 
WILL drink more coffee...

Terry Fox wrote on 5/29/2017 8:46 PM:  
I have recently purchased three new SDRs for testing  and playing with.  Up 
front:  I have NO RELATIONSHIP with any of  these companies, other than 
being a customer, who paid full-price for  everything. 

1/2:  BooyaSDR 
The first two are BooyaSDR  units.  These are different than almost all 
other SDRs available to RF  enthusiasts at the moment, in that they sample the 
RF input directly, then  send ALL those samples to the host computer.  No 
FPGA or other device  to reduce the amount of samples.  The host computer then 
does all the  computations to show the FULL bandwidth of their respective 
input.  The  software shows this spectrum display in a series of waterfalls 
stacked on  top of each other.  I purchased one of the 100MHz full SDR &  
antenna, and then a 16MHz digitizer set, less antenna.  I also have a  64MHz 
oscillator that I can put in place of the socketed 100MHz oscillator,  so I 
can test the boards at that lower rate.  


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