Thanks for the info Gerald. I'm still confused why a mode change would
affect the spurs as seen on the panadapter. Aren't mode changes handled
completely in software? I'm not having a problem with CW or USB/LSB
spurs. But when I switch to AM or FM, new spurs show up on the
panadapter, many of which are now in the wider passband.
73,
Clay W7CE
On 11/12/2010 6:15 AM, Gerald Youngblood wrote:
Tim is correct about the cause. This is being addressed as part of
the CW iteration.
Gerald
Gerald Youngblood, K5SDR
President and CEO
FlexRadio Systems(TM)
13091 Pond Springs Road, #250
Austin, TX 78729
Phone: 512-535-4713 Ext. 202
Email: [email protected] <mailto:[email protected]>
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PowerSDR(TM) is a trademark of FlexRadio Systems
On Fri, Nov 12, 2010 at 7:27 AM, Tim Ellison <[email protected]
<mailto:[email protected]>> wrote:
I believe that on the 3000, the QSE is left on during RX to
improve RX/TX/RX switching performance and it is leaking into the
QSD. If this is the case, it is a known problem and I believe it
is one of the things that will be addressed when the CW is revamped.
-Tim
-----Original Message-----
From: [email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] On Behalf Of Clay W7CE
Sent: Friday, November 12, 2010 2:41 AM
To: Flexedge
Subject: [FlexEdge] Flex 3000 Spurs on AM
I had hoped that 2.0.16 would fix this problem, but it looks
unchanged.
If I tune to 50.400 MHz (the local 6M AM frequency) and select AM
mode with a 6.6 kHz BW, there are 4 spurs in the AM passband with
the strongest at -100 dBm (S 4.5). If I turn SR on, the spurs
move and decrease in amplitude, but there are still 4 spurs with
the strongest at
-114 dBm (S2+). If I select USB, LSB, DSB, CWL or CWU the spurs
disappear from the panadapter. I don't know if this happens on
the lower frequencies, but it makes AM unusable on 6M. I just checked
50.300 on FM and the same issue exists. The spurs will be
stronger than many FM simplex stations on that frequency.
Why does changing mode cause a change in the spurs? I wouldn't
expect the DDS to be reprogrammed when the mode changes.
Is this a known problem that will eventually be fixed? BTW, I've
never seen this on my 5000A.
73,
Clay W7CE
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This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software development and experimentalist who are
using beta versions of the software.
