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]> 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
> >
> >
> >
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