Regarding key clicks. I suspect this may vary considerably with the specific circumstances including the likelihood of considerable variations in the individual transmitter rise and fall times and and the roofing filter bandwidths.
Last November, I think, I read a suggestion about blanking key clicks suggesting mainly the more extreme dsp settings, especially 3-7. In the following 160 contest, one of the local contesters who uses Yaesu equipment was kind enough to furnish loud key clicks that I was able to test with, At the time, I had the nominal 250 Hz filter and the 2.8 KHz filter with the 2.8 KHz filter being ineffective. Since I didn't have an antenna set up for transmitting at the time, I was free to experiment. The best blanking effect was with the 3-7 dsp setting and, at roughly 130 Hz spacing from center on the high side of the 250 Hz filter which has asymmetrical slopes, the click and other spur level was reduced by four S-units on the K3 meter, allowing me to copy weak signals at that separation. The analog blanker may have some effect on the blanking of clicks but it wasn't nearly as obvious as the dsp blanker. Since then, I've acquire a 500 Hz filter but I haven't had the chance to test it in the same combat conditions. I don't know if the NR would help with the 500 Hz filter; it does on other impulse noise whereas the NR is fairly useless at 250 Hz. Dunc, W5DC ______________________________________________________________ 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
