On 2/6/2011 7:28 AM, Joe Subich, W4TV wrote: > The 400 Hz INRAD is probably the best compromise. Wide enough for > tuning the band but good skirts/reasonable selectivity. The 250 > would seem to require rather critical tuning.
The words "would seem" suggests that you have not actually used the 250 Hz filter, or have not used it much. I HAVE used both 250 Hz and 400 Hz 8-pole filters extensively, and I do NOT feel that the 250 Hz filter is too narrow or that it requires "rather critical tuning." The -6dB bandwidth is roughly 330-350 Hz, so if you use it as K6LL has suggested (that is, tell the K3 it's a 400 Hz filter), it's nearly ideal for crowded band CW and RTTY contesting. If you want to listen wider, simply use the width control. > I find the 1.5 KHz filter to be too tight (I have a couple). It > requires too much adjustment to be useful, particularly in the > "heat of "battle." The overall difference between 1500 and 1800 > in the IF doesn't mean much when using a more narrow DSP setting > but it is significant in ease of use when tuning. I haven't used the 1.5 kHz filter, but I use the 1.8 kHz filter virtually all the time for SSB contesting. I find it rather tweaky to tune "just right," and I definitely would NOT want anything narrower for SSB. I tell the K3 that it is a 2 kHz filter. 73, Jim K9YC ______________________________________________________________ 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
