Pierre, The roofing filters may not necessarily help with such strong signal rejection as you would have had with 2 KX3s transmitting simultaneously on different parts of the same band.
The usefulness of the roofing filters is to protect the receiver front end from normal level signals that are within the passband of the roofing filter, but not within the passband of the DSP filter. The result is AGC Pumping by the stronger signal which may not even be heard because the DSP filter cuts it out. 73, Don W3FPR On 7/23/2012 10:34 PM, Pierre wrote: > Hello to all. > > Maybe that I don't understand the real utility of the roofing filter but I > observed this. Last saturday, we were on a SOTA summit using two KX3s about > 40 feet appart transmitting CW at 5 W. And even with the roofing filters on, > we heard each other's sending as a diffuse noise. I know that changion RX > shift to 8 disable the roofing filters, but we were not using that shift. > > So, am I missing something about the use of these filters? Are they designed > for operations with operators near each other like SOTA activation on a > crowded summit ? > > 73, de VE2PID KX3 S/N 190 > ______________________________________________________________ > 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 > ______________________________________________________________ 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
