Mike, This new ruling (when it takes effect) amplifies the cardinal rule - "User, know your transceiver and how it handles both the transmit and receive frequencies for all modes".
Knowing the frequency you are transmitting on has been an FCC requirement from day one. They do not care about your receive frequency. not only that, but the transmit frequency is defined in their terms. We hams use the SSB suppressed carrier frequency,, but (at least for 60 meters), the FCC regs refer to the center channel frequency - the suppressed carrier frequency is left for us to figure out. You did answer that question on your ham exam correctly, did you not - 2.8 kHz width divided by 2 equals 1.4 kHz, so shift the suppressed carrier down by 1.4 kHz. NOW, I can't resolve why everyone uses a downward shift of 1.5 kHz instead of a shift of 1.4 kHz - perhaps someone can explain that difference to me. I see nothing in the FCC documents that provides for a 100 Hz guard band which would increase the effective channel width to 3.0 kHz and thus yield a suppressed carrier shift of 1.5 kHz from the channel center. Mysteries, mysteries, mysteries - but that is the way we are told to do it, and the FCC has not complained so far - maybe just "let sleeping dogs lie" is the best recourse. 73, Don W3FPR On 11/20/2011 11:22 PM, Mike Morrow wrote: > Don wrote: > >> I actually was responding to a statement made in a post saying that most >> transceivers shift the TRANSMIT frequency. > Hi Don. Well...er...that *might* have been me when I wrote: > >> When the transceiver is shifted to CW mode, the receiver frequency typically >> remains 5357.0 kHz, while the transmitter frequency is shifted up to >> typically >> 5357.8 kHz (for 800 Hz CW sidetone). > :-) > >> If there are any that do... > In my defense, some ancient rigs like the TS-120S and others from 30 years ago > DO maintain the RECEIVER carrier frequency the same as mode changes are made, > and maintain TRANSMITTER carrier frequency that same value for LSB and USB. > But > they shift the transmitter carrier frequency up (and change the displayed > frequency) > by 0.8 kHz during CW transmission. The TS-120S in CW mode sets the receiver > to > USB mode, say, on 3550.0 kHz, and when the transmitter is keyed, the > frequency and > the display shift to 3550.8 kHz. The display always shows transmit frequency > when transmitting, and always shows receive frequency when receiving. The > current convention always shows transmit frequency, even while receiving in CW > mode. > > In a way, that process more clearly shows what is happening. Today, most rigs > show no change in displayed frequency on CW between transmit and receive. The > casual observer knows something is changing frequency, but it's not obvious > what. > >> ...I believe they are in the minority. > I'm sure you're correct. Few rigs today follow that convention. I prefer the > current convention. > > 73, > Mike / KK5F > ______________________________________________________________ > 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

