<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<font face="Courier New, Courier, monospace"> The recent report by
Adam Farson VA7OJ/AB4OJ Apache Labs Test report (
<a class="moz-txt-link-freetext" href="http://www.ab4oj.com/sdr/apache/anan100d_notes.pdf">http://www.ab4oj.com/sdr/apache/anan100d_notes.pdf</a> ) 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.<br>
<br>
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.<br>
<br>
<br>
ANAN-100D Angelia 1.9 firmware. PowerSDR mRx FFT 3.1.5. Cross
band filter issue.<br>
<br>
<br>
Reset database, restart PowerSDR. Power up radio.<br>
<br>
Terminate ANT2, ANT3, with 50 ohm shielded terminations.<br>
<br>
Connect appropriate HF antennas to RX1 and RX2<br>
<br>
Select RX1, RX2 Meter Sig Avg<br>
<br>
Select CW, 500hz filter for all bands on RX1 and RX2.<br>
<br>
<br>
Setup/Ant Filters/HPF/LPF tab, Enabled checkmark for ByPass/55Mhz
HPF<br>
<br>
<br>
Alex Manual/Bypass enabled Alex Auto/Bypass
disabled<br>
Freq RX1/ANT1 RX2/RX2 RX1/ANT1 RX2/RX2<br>
RX1 14100 -120.5dbm -114.0 -120.9 -115.6<br>
RX2 14100<br>
<br>
RX1 14100 -114.0dbm -118.2 -133.4 -120.5
RX1 dropped 19.4db when RX2 set to 6m<br>
RX2 50100<br>
<br>
RX1 28100 -127.0dbm -126.9 -127.5 -126.4
<br>
RX2 28100<br>
<br>
RX1 28100 -126.1 -128.0 -134.2
-128.3 RX1 dropped 8.1db when RX2 set to 6m<br>
RX2 50100<br>
<br>
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.<br>
<br>
<br>
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. <br>
<br>
<br>
Is anyone else seeing similar results?<br>
<br>
Bill KC9XG<br>
<br>
</font>
</body>
</html>