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<font face="Calibri Light">Hello,<br>
<br>
Have received my ANAN200D two weeks ago and am quite happy with
it.<br>
Having two high performance phase coherent receivers was the main
reason to buy it.<br>
<br>
Please let me share with you one single wish for the "improvement
wish list".<br>
<br>
I have a number of applications for it e.g. measuring NVIS
polarization and playing with noise/qrm reduction techniques.<br>
They all have in common that they need two identical receivers.<br>
Identical in pass band characteristics (amplitude and phase) and
phase coherent (phase difference 0 degrees).<br>
SDR is the only practical way to implement that.<br>
<br>
Up until now I used two Elecraft K2 receivers made phase coherent
by sharing the same oscillators.<br>
The IF Xtal filters e.g. are not identical, so I had to connect a
noise source to both receivers and to equalize the pass bands in
the DSP.<br>
Every time I switched bands and/or mode I had to perform the
equalization.<br>
<br>
I am using two laptops in my setup.<br>
The first one runs PowerSDR and controls the ANAN200D.<br>
The second one is dedicated to my DSP using Matlab/Simulink. <br>
In that way I have all the performance of the second laptop
available for the DSP.<br>
The audio of the line outs on the DB25 connector on the ANAN200D
is fed into a USB sound card which is connected to the second
laptop.<br>
<br>
By using VFOSync, CTUN and Stereo Diversity the phase relation
between RX1 and RX2 is fixed.<br>
Any phase jumps in the phase difference between RX1 and RX2 are
directly visible in my setup.<br>
However the actual phase difference can be anything.<br>
So I still have to perform the equalizing.<br>
<br>
I noticed that changing bands is not possible with CTUN enabled.<br>
This makes changing bands complicated and each time the phase
difference between RX1 and RX2 changes.<br>
May be there is a better way of doing it?<br>
<br>
I am happy with the ANAN200D. It fits very well my applications.<br>
However it would be great if the Stereo Diversity switch would
always force the RX1 and RX2 phase difference locked to zero
degrees.<br>
<br>
73 Jan PA0SIM<br>
<br>
My PowerSDR settings<br>
enabled: RX2, VFOSync, CTUN, SD<br>
AGC: Fixed GAIN e.g. at 80<br>
Master AF: e.g. at 15<br>
ATT: -20dB<br>
Pan main receiver: left<br>
Pan RX2: right<br>
ANAN200D firmware: Orion 4.3<br>
<br>
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