> By the way, if you have a P3 you can see the spikes on make, break, or > both on the > waterfall. You can spot the rigs that are using semi-QSK that have a big > spike on the > first dit and then quiet down, too.
Same with relative SSB IMD monitoring. I've been looking at the area near the SSB carrier set point since IMD is not confused with Tx bandwidth. Wow, some huge differences between stations. And several ESSB ops with emphasized low end are not necessarily a problem. With a bit of practice you can clearly see the grunge below the set point and even call a rough value. I've seen rough values vary from -20 dBc to better than -50 dBc. On 20m last week, an ESSB op was using a TS-950SDX and Alpha 89. Using the SDR-IQ, he had one of the cleanest spectrums I've seen. By contrast, an op using an FT-1000D and ACOM amp showed about -30 dBc I want to emphasize that these are not actual IMD numbers -- only a relative IMD indication. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
