Hi Mooneer, Looking at the image - yes that's being overdriven on tx somewhere. In particular the "grass" at either side of the signal is only 20dB down.
Try backing off the radio mic gain and/or output level from the SM1000 until you get a nice clean spectrum. Then you might be able to bring the power back up again. This blog post: http://www.rowetel.com/blog/?p=3109 has a video demonstrating exactly this issue (6 minute mark in video). Cheers, David On 19/05/15 17:00, Mooneer Salem wrote: > Hi David, > > Lowering to 1 bar of ALC on the KX3 appears to have lowered effective > output power to 2W. I also moved the dummy load so that it's about 3-4 > feet away from the IC-7200 and lowered RF gain on said rig (was S9 or so > at max gain). I posted a couple of screenshots at > http://imgur.com/a/YSAF7 that seem to indicate little change in results. > I'm going to let the KX3's batteries recharge overnight and try a couple > of other things tomorrow. > > Thanks, > > -Mooneer K6AQ > > On Sat, May 16, 2015 at 11:45 PM, David Rowe <[email protected] > <mailto:[email protected]>> wrote: > > Hello Mooneer, > > Try backing off the tx drive so that your average power output when > using FreeDV is 2W and see if the SNR improves. On a 100W PEP SSB radio > 20W is a typical average power > > Unlike other digital modes FreeDV has a fairly high peak/average power > ration (similar to analog SSB). Hence we recommend just 1 bar of ALC. > > Also try reducing RF gain on yr test Rx, possible there is some clipping > there. Overdriving at either the tx or rx side will be evident by a low > SNR, poor scatter diagram, or "grass" either side of the spectrum. > > Some more notes in the SM1000 User Guide, you may have seen these > already. > > Thanks for your kind comments on the SM1000 :-) > > Lets us know how you go! > > Cheers, > > David > > On 17/05/15 15:19, Mooneer Salem wrote: > > Hi all, > > > > I received my SM1000 the other day and have been working on setting > > proper levels with my KX3. Since I don't have any attenuators, > I'm using > > a dummy load placed close to an IC-7200 connected to a PC running the > > FreeDV application to check spectrum and plots. KX3 is set to 5 watts > > output. > > > > However, it appears that I have to set the Rig Mic pot on the SM1000 > > cranked all the way to the right and to set the KX3's mic volume to > > somewhere in the mid 40s to get a full 5 watts out. Is this expected? > > Also, the ALC doesn't appear overdriven (in fact, it might still be > > under-driven since Elecraft recommends 3-4 bars for other digital > modes) > > yet I can only get a maximum SNR of ~10dB according to the FreeDV > app. > > BER also appears to be higher than expected for a signal source > > extremely close to the receiver at around 0.015 or so and the scatter > > plot doesn't seem to be that tightly grouped either. > > > > Any idea what the problem could be? Hopefully I just forgot something > > somewhere and/or this is simply a result of my non-optimal test > setup. > > > > (BTW, I love how this thing is pretty much plug and play if you > have the > > cable kit from Elecraft--one cable each for the KX3's mic and speaker > > and one to ACC2 for PTT; ACC2 IO = PTT LO in the settings menu > completes > > the configuration.) > > > > Thanks, > > > > -Mooneer K6AQ > > > > > > > > ------------------------------------------------------------------------------ > > One dashboard for servers and applications across > Physical-Virtual-Cloud > > Widest out-of-the-box monitoring support with 50+ applications > > Performance metrics, stats and reports that give you Actionable > Insights > > Deep dive visibility with transaction tracing using APM Insight. > > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > [email protected] > <mailto:[email protected]> > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
