On Feb 2, 2011, at 2/2 11:14 AM, gold...@charter.net wrote: > Thanks that now makes sense to me. However, than almost every signal > that I am looking at is outside of the two main carriers. Like little > spikes, I don't know how else to define it.
You only see two clean rails (plus IMD rails) when the PSK31 signal is idling. When someone types, their PSK31 signal will produce other sidebands -- so you see that fuzzy signal on a waterfall. With enough trickery, you can measure 3rd order IMD even when a station is actively transmitting. But the best time to measure is when a station is idling. > The IMD Meter you mention looks like a good investment. An even better investment is the Elecraft Directional Coupler. You can then tap the output from the K3 and feed that into a second receiver that has a computer connected to the second receiver's sound card. Measuring IMD is not so good if you just use a short sense antenna. Best to tap off of a directional coupler. 73 Chen, W7AY ______________________________________________________________ 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
