Thank you Joe, I have been looking for an explanation of most of what you covered here for several months. I'll pass it on to my buddy that mentioned the "Icom sound"! -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info
On Tue, 2014-04-29 at 10:04 -0400, Joe Subich, W4TV wrote: > A "spike" on the left of a USB signal is normally an indication of > insufficient carrier suppression (carrier leakage). Signal to the > left of that is generally insufficient opposite sideband suppression > (sideband leakage) or regenerated sideband due to excess IMD in the > transmitter. > > However, if the other station is using ESSB with excess low frequency > content below 150 - 200 Hz, the spike can be a "false carrier" due to > ringing in the modulator when it is over driven by the excess low > frequency content. "False carrier" or modulator ringing is almost > always accompanied by IMD and regenerated opposite sideband. > > Most SSB users will tend to zero beat the false carrier. That will > cause a "robotic" or "hollow" sound because excess low frequency > content, the signal is actually tuned slightly off frequency, and > the normal/regenerated sidebands are not producing the same/in phase > audio. > > 73, > > ... Joe, W4TV > > > On 4/29/2014 9:31 AM, Slava Baytalskiy wrote: > > Hello everybody! > > Ever since i got my new P3 - i've been looking at people's signals > > (naturally). > > And i've noticed the following: > > When using USB on 10 meters, talking locally, there are a couple of folks > > that use ICOM radios and i can see these spikes on the left of the carrier. > > Normally, in USB, all the signal shows up on the right, correct? > > But with these guys there's a lot of signal on the left as well. > > And they sound a bit robotic, as if they were off frequency a bit. But they > > aren't. > > When they switch to, say, Yaesu or a Kenwood i don't see that same graph. > > But on the ICOM its very pronounced (except the older ones like 756 Pro > > III). > > Saw it last night with an ICOM IC-7000. > > > > Is this normal? Has anyone else noticed this? > > This P3 is certainly giving me a lot of insight i didn't have before... > > > > Thanks in advance! > > > > Slava B > > W2RMS > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to li...@subich.com > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to d...@nk7z.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
