Hi Wayne and all: My filters are 200, 400, 1.0, 1.8 and 2.7 and they are all CW enabled. I was using headphones and my sub RX was off. My serial number is 2208 and the radio was factory assembled (including the sub RX).
I did not hear key clicks when this was happening. The off frequency transmissions were clean. I also made a point of observing the signal strength of the offending stations and they were usually S8 or S9. Not the 20db or 40db over S9 that I was expecting. I thought it was interesting that recovery was noticeably slow on the DX station's frequency when this was happening. However, under normal conditions when US stations were calling directly on top of the DX station, recovery was fast. Hence the ability to copy the DX station through the dits when the QRM was on frequency. Maybe a passband shift could of helped. I would like to see the shift limits changed to something less than 50Hz. Maybe 10Hz on CW and 50Hz on other modes. I appreciate the interesting ideas from K6LL and W4ZV. Unfortunately I'll have to wait for the next busy contest to try them out. This just isn't the type of condition you can experience under normal band conditions. 73, Mike K2MK wayne burdick Sun, 22 Feb 2009 18:26:03 -0800 Mike, The K3 is virtually desense-proof, with a BDR of ~140 dB. But to take advantage of this, you need a narrow crystal filter -- the closer to the DSP bandwidth the better. This is exactly the situation that we had in mind when we designed the 200-Hz 5-pole filter. For CW pileups, you can't beat it. What crystal filter were you using at the time? Of course if the transmitting stations are "wide" due to key clicks, there may be situations where no amount of filtering can help (for any receiver). The DSP noise blanker and NR may be useful sometimes -- you might give this a try. Wayne N6KR On Feb 22, 2009, at 4:45 PM, K2MK wrote: > I had a great time with my K3 during the ARRL DX contest. I do S&P and > I was > trolling around with my filter width at 50Hz. Absolutely outstanding. > The > auto spot is equally outstanding. > > At 50Hz width it was quite clear that many stations call off frequency. > Using RIT, I could see that it was typical for them to be 70Hz or more > away > from the DX station but I could not hear them in my 50Hz passband. The > real > problem was when one of them was S9 or greater. They completely swamped > weaker DX stations. ______________________________________________________________ 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
