Clay,
I think the Spur you see on 6 meter when in the AM mode are the
result of the fact that the current versions of PSDR keep the TX active
during receive to enhance CW turnaround time.. In CW/SSB the Carrier is
uppresed until modulation is applied and you see no spurs.. In AM/FM the
carrier is always on and you see the spurs on 6 Mtrs( maybe 10).. On the
lower HF bands there is enough natural isolation so that the spurs are
not visable.
Al, K0VM
On 11/13/2010 9:22 AM, Clay W7CE wrote:
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]>
Web: www.flexradio.com <http://www.flex-radio.com/>
Tune In Excitement (TM)
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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used for posting topics related to SDR software development and
experimentalist who are using beta versions of the software.
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