Bill, The advantage to using a higher center frequency is that there is less possibility of a 2nd harminic 'ghost' on the data mode signal - caused by soundcard distortion or other artifacts. With the K2, a center frequency with a narrow passband may be limited by the BFO range. That is usually only a problem with RTTY (lsb), but not the normal RTTYr (usb) while using a narrow filter width (500 Hz or less). Typical operation with data modes use USB, so the problem is minimized (or non-existant) in normal operation.
73, Don W3FPR Bill Strong wrote: > Don, > > Thank you for your response. I read all of your posts. > > I will do as you say. I can see that a center of 1000 Hz would be what I > need for use of the 2.2 KSB2 filter for transmitting. > > By way of explanation I have been using the waterfall display on DM 780 to > set my filters as it seemed to accomplish what I needed. I have been > following the K3 PWR Out discussion concerning PSK. I used a watt meter to > determine that when transmitting PSK my power out is best over a 1000 Hz > range centered on 1400 Hz in the passband of the 2.2 filter (using the > waterfall to measure this). That is the reason I was trying to get > everything centered on 1400 Hz in the passband of the transmitting filter. > It is my understanding that any SSB transmission will go through the KSB2 > 2.2 filter? so it would be ideal to be centered on it? > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.0.233 / Virus Database: 270.10.16/1930 - Release Date: 01/31/09 > 20:03:00 > > ______________________________________________________________ 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
