Jim wrote: > Do I understand where the CW transmission actually is (600 Hz above dial > frequency)? Please explain.
No. As Don pointed out, most modern transceivers always show transmitter carrier frequency in the display. On USB and LSB, that will also be the receiver carrier frequency. On CW, however, if the receiver functions in USB mode the receiver carrier frequency will be shifted BELOW the transmitter carrier frequency (always shown in the display) by the offset (pitch) being used. The receiver carrier frequency is *never* actually shown in the display while in CW mode. (I don't know if the K3 allows the option of using the receiver in LSB mode for CW mode. If so, then this whole discussion would need changes to take that into account if the LSB-CW option is being executed.) For examples in the discussion below, I'll use the new 60m channel of 5358.5 kHz (center), or 5357.0 (carrier), as defined in section 97.303(h). > USB - set VFO to the lower edge of the "channel (1500 Hz below center > frequency). Giving audio emissions from 300 to 3000 Hz above that. Correct. Put 5357.0 in the display. That's all that's needed in USB mode. Do the same for Data and RTTY transmissions (including PSK31), using USB mode. > K3 and CW - on my waterfall (in HRD) the trace made by my CW transmission is > at the (+)600 marker above the bottom of the waterfall. This is where I > conclude the transmission actually is, resulting in the 600 Hz tone above > where I am actually tuned. All true. But on CW, your receiver's carrier frequency is NOT the frequency shown in the K3 display. On CW only, the receiver carrier frequency is BELOW the transmitter carrier (and displayed) frequency by the amount of your pitch offset...0.6 kHz for you. If the K3 shows 5358.5 kHz on CW, your receiver carrier frequency is 5757.9 kHz, USB. > Now, do they want this actual +600 Hz transmission in the center of the > channel? Yes...but leave out that "+600 Hz" part. More precisely, your transmitted CW signal **must** always be ON the channel center frequency. Set the dial for 5358.5 kHz in CW mode. > Or do they want us to tune to the center of the band and transmit 600 Hz > above that? Definitely not! To do so would place you 0.6 kHz too high (5359.1 kHz) above the correct frequency (5358.5 kHz). Plus, since the K3 ALWAYS shows transmit carrier frequency, you must have the display showing 5359.1 in order to transmit 600 Hz above the channel center frequency. In that case, your receiver's carrier frequency is 5358.5 kHz, but that's not what you want. (By "band", you mean "channel".) > If they are tuned to the lower edge of the band... > ...do they want to hear a 2100 Hz tone (with us tuned to the center frequency) No. Dump that whole line. > ...or do they want to hear a 1500 Hz tone... If "they" had a receiver in USB mode tuned to the channel's *carrier* frequency of 5357.0 kHz (defined for phone, data, and RTTY modes), then your CW signal on the correct frequency of 5358.5 kHz would produce a 1500 Hz tone in their receiver. > (with us tuned 600 Hz below center frequency)? Establishing your CW transmission on the channel center frequency (5358.5 kHz) means that will be what is shown in the K3 display. But on CW, the carrier frequency of your receiver will NOT be what's in the display, but rather what's in the display minus your CW offset. So, your receiver's actual USB carrier frequency will be 5358.5 kHz - 0.6 kHz = 5357.9 kHz, or 0.9 kHz ABOVE the channel's specified carrier frequency of 5357.0 kHz. But there's no real significance to that. The rules don't care where your receiver carrier frequency is...only you do, for the desired sidetone pitch. Someone who liked an 800 Hz pitch would have his receiver carrier frequency set at 5357.7 kHz. Just make sure on CW that the channel center frequency is shown in the display. That always shows transmitter carrier frequency. Everything else will turn out all right. > On PSK31 - Do they want us to tune to the bottom of the channel and then > transmit only a single signal directly on the 1500 Hz marker? There would > be room for many others as well without exceeding the bandwidth allocated to > us. No. The new section 97.303(h) says in part "...control operators of stations transmitting phone, data, and RTTY emissions (emission designators 2K80J3E, 2K80J2D, and 60H0J2B, respectively) may set the carrier frequency 1.5 kHz below the center frequency as specified in the table..." You must use USB to transmit your PSK31 (60H0J2B) signal, and you "may" set the USB transmitter carrier frequency 1.5 kHz below the channel center frequency. The channelized mode of operation means that most hams will use fixed frequencies stored in memory rather than a VFO, so putting any phone, RTTY, or data transmission on that suggested carrier frequency would seem prudent, even if it can be argued that the rule allows the USB carrier frequency to be below the channel center frequency by less than 1.5 kHz, as no doubt PSK31 could easily accomodate without exceeding channel bandwidth limits on the high side of the channel. > And what is this "data using PACTOR-III technique"? There are discussions and references to PACTOR-III starting on page 6 of the document at: http://transition.fcc.gov/Daily_Releases/Daily_Business/2011/db1118/FCC-11-171A1.pdf It's not something most hams are likely to use, but that might be useful in some emergency traffic situations with non-ham stations. > Somebody please straighten me out. That's my best attempt. 73, Mike / KK5F ______________________________________________________________ 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
