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] > 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
