Yes, I did search the archives to find out "why you can transmit through some filters and not through others" before posting this question to the reflector. The only "authoritative" information I found information was this from July 2008:
"Until further information to the contrary is available from Elecraft, you must select the 2.7 or 2.8 filter for SSB, Data and CW transmit. The AM transmit filter must be 6 kHz and the FM transmit filter must be 13 kHz. Any other settings will result in failure and a ERR TXF (Error TX Filter) message. See the Errata sheet that shipped with your K3. 73, Don W3FPR " To the best of my ability to discern, this does not indicate the reason for the limitation. In fact, the phrase "until further information" and the fact that ESSB uses a different filter than "traditional" SSB indicates to me at least the possibility that there may be "firmware" reasons for this limitation (like BFO alignment on TX and RX), not that there aren't also possibly "hardware" reasons (like carrier rejection, etc.). If someone knows the theory of the radio's operation well enough to help me understand the limitation, I would like to be enlightened. So yes, I did look for the answer in the reflector archives and no, this is not a request for Elecraft to take valuable time out from their other activities to react to my personal "wish list." -- 73 -- Brian -- K1LI On Sun, Jan 24, 2010 at 1:19 PM, Jim Brown <j...@audiosystemsgroup.com>wrote: > On Sun, 24 Jan 2010 10:01:05 +0000, rfenab...@gmail.com wrote: > > Have you searched the reflector or the website for past communications on > the topics that interest you? There are engineering reasons why you can > transmit through some filters and not others. These are not firmware issues, > they are RF design issues. Elecraft has very good engineers, and they tend > to make good decisions. > > Jim Brown 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
