Mike, I actually was responding to a statement made in a post saying that most transceivers shift the TRANSMIT frequency. If there are any that do, I believe they are in the minority.
With the K3, if 5 memories are used for 60 meters, one can set channel hopping, but that also makes it easy to switch between SSB and CW - if one sets VFO A to SSB (with its correct carrier frequency) and sets VFO B to CW with its correct center channel frequency, then changing between SSB and CW is simply a matter of tapping the A/B button -- the M1 - 4 buttons could be used for data modes if desired. 73, Don W3FPR On 11/20/2011 7:23 PM, Mike Morrow wrote: > Don wrote: > >> Not all transceivers shift the transmit frequency. > Hi Don. I suspect that *most* rigs do NOT shift the transmit frequency > when changing from USB to CW. My ancient TS-50S does not. But that > has nothing to do with the issue. > >> The Elecraft K2 and K3 dial always indicate the carrier frequency, and >> what is displayed does not change when changing modes. > That's identical to the Kenwood TS-50S. > > If the TS-50S display shows 5357.0 kHz (the new 60m carrier frequency), > it will show that as LSB, USB, or CW modes are selected. That accurately > reflects the transmitter carrier frequency remaining unchanged for all three > modes. However, the TS-50S is normally configured when in CW mode for the > receiver to be in USB mode, but shifted down from the displayed frequency > by 0.8 kHz so that a received signal on 5357.0 kHz will produce an 800 Hz > sidetone. So, the transmitter carrier frequency remains 5357.0 khz, and > the receiver carrier frequency shifts down to 5356.2 kHz when mode is > changed from USB to CW. > >> With either Elecraft or Yaesu, there is nothing complicated to figure >> out - set the displayed frequency to the center channel frequency - but >> with the Yaesu, one must do that AFTER setting to CW mode. With the >> Elecraft gear, you can set the frequency in whichever mode you choose, >> then switch to CW. > But "complexity" is not the issue. > > Regardless of whether the receiver or transmitter is shifted to switch > between USB and CW, the point here is that one will NOT be able to have > his Elecraft (or any other rig) tuned to 5357.0 kHz on USB, and then > simply switch mode to CW and carry on. The Elecraft, my Kenwood, and most > other rigs would then transmit on 5357.0 kHz, **violating** the > requirements of the new FCC rule 97.305(f) that CW signals on the 60 > meter channels transmit on the channel center frequency (here 5358.5 kHz). > For every ham rig currently available (including the K3), some thought > will need to be exercised before transferring modes between USB and CW > on the 60 meter band. It's NOT going to be only the simple and customary > shift of the emission mode switch to CW...it will also require ensuring that > the CW transmission takes place on the channel center frequency, 1.5 kHz > above the channel carrier frequency! That's the ONLY point I've tried to > show. The constraints of channelized operation are still somewhat foreign > to most hams, and this particular issue arises only due to the addition > of CW as a new U.S. 60m band mode. > > For rigs whose carrier frequency never changes with mode change, the > easiest approach to add 60 meter CW capability will be by programming > five channels on the specified 60m *carrier* frequencies (like 5357.0 kHz) > for USB Phone, Data, and RTTY (but NEVER CW) modes, plus five frequencies > on the specified 60m *center* frequencies (like 5358.5 kHz) for CW mode > ONLY. > > I suppose it will need to be determined if there is any value, for 60m > only, of enabling a shift from 5357.0 kHz USB operation to 5358.5 kHz > CW operation with no operator intervention other than changing mode. > Were that desired, then the rig in question would need to shift the > transmitted carrier frequency from 5357.0 kHz to to 5358.5, and shift > the receiver carrier frequency from 5357.0 kHz to 5357.7 kHz (if an > 800 Hz sidetone pitch is desired). > > Such issues have never been been imposed on ham band operations, and > thus represent a novelty to most. Even those familiar with MARS, CAP, > SHARES, etc. have likely not dealt with such, since little or none of > the operations on those outside-ham-band services use CW. > > FWIW, the effective date of the 60m band changes in the US is 30 days > after publication of the rule changes in the Federal Register, and > **NOT** 30 days after the FCC approval on 18 November 2011. Folks > must take care NOT to use the new rules BEFORE they are effective, > and NOT to use the old rules afterward. > > Anyone wishing to monitor the Federal Register for rule publication > can do so at: > > > http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR&browsePath=2011 > > 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
