[hpsdr] Janus Lives!!

[Philip Covington]

On 7/3/06, Gerald Youngblood <gerald at flex-radio.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Phil,
>
> The spectrum looks very clean.  Great work!
>
> There appears to be one problem with the measurements though.  The noise
> floor in the screen shots cannot be accurately calibrated since the 500 Hz
> RMS noise measures -159 dBm.  If you subtract 26 dB for the 500 Hz
> bandwidth, you get a noise floor of -185 dBm/rt Hz.  This is below kTB of
> -174 dBm/rt Hz.  That would equate to a negative NF (-11dB).  I would be
> interested in seeing the 500 Hz bandwidth shot after calibration with the
> radio attached.
>
> 73,
> Gerald
>
> Gerald Youngblood, K5SDR
> FlexRadio Systems
> Ph: 512-535-5266
> Fax: 512-233-5143
> Email: gerald at flex-radio.com
> Web: www.flex-radio.com

Gerald, don't you know that Phil has his JANUS immersed in a dewar of
liquid nitrogen? :-)

73 de Phil N8VB

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