[hpsdr] ANAN-100 Cross Band Filter issue.

[Bill Diaz]

   The recent report by Adam Farson VA7OJ/AB4OJ Apache Labs Test report 
( http://www.ab4oj.com/sdr/apache/anan100d_notes.pdf ) showed what he 
thought might be a "possible RF filter switching issue." causing 
degraded MDS at 50.1Mhz.  The following may be another example of a 
ANAN-100D 50.1 Mhz RF Filter switching issue.

   If you operate cross band with 6 meters on RX2 and select any band 
from 160 thru 10 meters on RX1, RX1 noise floor and signals drops 8-20 
db when the Alex 6M LNA/ HPF is activated.  Similar results can be 
observed when RX1 is tuned to general coverage / SW broadcast 
frequencies / WWV and RX2 is on 6 meters with the 6M LNA/HPF activated.


ANAN-100D Angelia 1.9 firmware.  PowerSDR mRx FFT 3.1.5. Cross band 
filter issue.


Reset database, restart PowerSDR.  Power up radio.

Terminate ANT2, ANT3, with 50 ohm shielded terminations.

Connect appropriate HF antennas to RX1 and RX2

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


         Alex Manual/Bypass enabled        Alex Auto/Bypass disabled
Freq          RX1/ANT1    RX2/RX2           RX1/ANT1      RX2/RX2
RX1 14100    -120.5dbm    -114.0            -120.9        -115.6
RX2 14100

RX1 14100    -114.0dbm    -118.2            -133.4        -120.5     
  RX1 dropped 19.4db when RX2 set to 6m
RX2 50100

RX1 28100    -127.0dbm    -126.9            -127.5        -126.4
RX2 28100

RX1 28100    -126.1        -128.0            -134.2  -128.3        RX1 
dropped 8.1db when RX2 set to 6m
RX2 50100

If RX 2 is set to 49.999mhz, then activating the ALEX 6M LNA / HPF has 
no effect on RX1.  As soon as RX 2 is tuned to a frequency within the 6 
meter band such as 50.001Mhz, activating the Alex 6M LNA causes RX1 
signals to be degraded.


Changing frequencies or bands of the ANAN-100D RX2 should not result in 
modifications to any settings of the RX 1 Alex HPF Filter settings.


Is anyone else seeing similar results?

Bill KC9XG

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