Jim, This is a very good example where the user should understand his radio - especially what is displayed for the frequency for each mode. For the K2 in either SSB or RTTY mode, it will be the suppressed carrier frequency - in CW it will be the carrier frequency of the signal (provided that you are hearing at the same pitch that you have set for your sidetone pitch).
With the K3, what is displayed depends on the data sub-mode. DATA-A will be like SSB where the suppressed carrier frequency is displayed - AFSK-A and FSK-D submodes will display the mark frequency (as long as you have set the proper mark frequency in the K3 menu). CW is subject to the same considerations as for the K2. I cannot speak for how other transceivers calculate the frequency displayed on the dial - it will be transceiver dependent, so the user should consult the matching manual for that information. One clue is to observe whether the receiver changes the frequency display when changing modes. The K2 and K3 do not change the displayed frequency when changing between CW and SSB - which should tell you that the K2 and K3 are displaying the carrier frequency (suppressed or not). Those that change the displayed frequency are most likely displaying the frequency the transceiver is tuned to (including the CW offset). For example, my Yaesu FT-900 indicates the correct frequency when tuned to a CW signal at the same pitch I have set for the sidetone, but if I switch to SSB mode (on the same sideband as I am using for CW), the frequency changes by 600 Hz and I still hear the same audio tone. With the K2 and K3, the displayed frequency does not change, but listening to a CW signal in CW mode, I will not hear the signal when switching to SSB because it goes to zero audio frequency. I know it is confusing, but I hope that I have made the point that each receiver may do it differently. Valid conclusions cannot be drawn until you know how each transceiver handles the displayed frequency. Introducing RTTY and data modes further complicate the picture. 73, Don W3FPR On 7/20/2011 12:24 PM, radioshoppe wrote: > Rich and other interested parties, > > As I understand what you are saying is that the frequency displayed on K3 is > actually the mark frequency rather than the suppressed carrier frequency. > > From my observations of the K2, as compared to the K3 in on air test, it is > the same. I have compared my transmitted and received frequency with an > FT-950 and FT-5000 and those radio's are essentially the mark frequency > below the K2. In other words, If they are transmitting on 21.080.00 I have > to tune the K2& K3 to 21.082.150 to hear them and for them to hear me. > > I don't see a problem in actual use other than if you agree to meet someone > on a certain frequency you have to add the mark frequency to the displayed > frequency to be communicate with them. > > ______________________________________________________________ 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
