[hpsdr] ANAN-100D 6 meter reception

[Bill Diaz]

I enjoyed reading Adam Farson VA7OJ/AB4OJ Apache Labs Test report ( 
http://www.ab4oj.com/sdr/apache/anan100d_notes.pdf ).  Adam used 
PowerSdr mRx FFT 3.1.5 but did not report what firmware he used in the 
tests.

Adam reported a 50.1MHZ MDS of -121dBm and a 28.1MHZ MDS of -131dBm. The 
10 db difference seemed similar to what I observe when I activate the 
Alex 6MLNA/HPF in my Apache Labs ANAN-100D.

I decided to use my meager resources to see if my ANAN-100D 6 meter 
performance was similar to the 6 meter results in Adams report.  While I 
do not have the means to measure MDS, I could observe relative noise 
floor levels on the different bands.   Note that I have not calibrated 
receive levels of my ANAN-100, so the absolute values will not be 
correct, but the relative noise floor measurements provide interesting 
information about 6 meter performance..

ANAN-100D Angelia 1.9 firmware.  PowerSDR 3.1.5.  Relative noise floor 
measurements

Reset database, restart PowerSDR.  Power up radio.

Terminate ANT1, ANT2, ANT3, and RX2 with 50 ohm shielded terminations.

Select RX1, RX2 Meter Sig Avg

Select CW, 500hz filter for all bands on RX1 and RX2.

Setup/Ant Filters/HPF/LPF tab, Enabled checkmark for ByPass/55Mhz HPF.
All other settings at default.

     Alex Manual/Bypass enabled        Alex Auto/Bypass disabled
Freq      RX1        RX2                RX1        RX2
1900     -137.7dbm    -137.9            -138.2      -137.9
3600     -138.5dbm    -137.9            -138.5      -137.9
5346.5   -137.5dbm    -138.8            -137.7      -138.8
7100     -137.7dbm    -139.5            -137.5      -139.3
10120    -137.5dbm    -139.1            -137.6      -139.0
14100    -137.3dbm    -137.6            -137.0      -137.7
18100    -137.5dbm    -137.8            -137.3      -137.9
21100    -137.2dbm    -137.6            -137.5      -137.7
24900    -137.7dbm    -136.9            -137.0      -136.9
28100    -137.5dbm    -136.8            -137.4      -136.9
50100    -135.4dbm    -136.6            -127.8      -136.9   RX1 noise 
floor increased 7.6db when 6M LNA/HPF activated.


It appears from the above my ANAN-100D 6m relative noise floor results 
co-relate somewhat to the differences between the 10m and 6m MDS values 
shown in Adam's report.  Based on the above we can assume Adam used the 
default PowerSDR settings and it is likely the 6M LNA/HPF was active 
during his 6M measurements.

It appears there is some issue with the 6M LNA/HPF activation in my 
ANAN-100D.  It would be interesting to see if others observe a similar 
increase in the 6 meter noise floor when the 6M LNA/HPF is activated.

Bill KC9XG





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