Mike, Not all transceivers shift the transmit frequency.
The Elecraft K2 and K3 dial always indicate the carrier frequency, and what is displayed does not change when changing modes. With Elecraft, the pitch of signals will change when changing between CW and SSB. OTOH, my Yaesu transceivers do shift the displayed frequency when changing between SSB and CW, but they shift the receiver - the display will indicate the transmitted carrier frequency. If you were receiving a signal in SSB mode and shift to CW, the pitch will stay the same. 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. 73, Don W3FPR On 11/19/2011 4:47 PM, Mike Morrow wrote: > The point to be taken is that most HAM transceivers, when the emission > mode is changed from USB to CW, shift either the effective receive or > the transmit frequency by the desired amount of sidetone frequency. > They don't shift both the effective receive AND the transmit > frequency. For example, a transceiver tuned to 5357.0 kHz on the dial > in USB mode will produce a zero Hz AF output when receiving a > transmitted signal of 5357.0 kHz, and a 1500 Hz AF output when > receiving a transmitted signal of 5358.5 kHz. 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). But the new FCC rules require that the > CW transmit frequency be 5358.5 kHz, which will produce an undesirably > high side tone to any USB/CW mode receiver set to 5357.0 kHz. If you > are in a USB phone QSO on 5357.0 kHz, anyone sending a CW signal on > that channel must do that using 5358.5 kHz. The phone boys will hear > not the typically 800 Hz sidetone, but rather a high 1500 Hz sidetone! ______________________________________________________________ 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
