I think we all need to be careful. In the case of USB, we put our "suppressed carrier" [i.e. dial reading on a K3] 1.5 KHz below the authorized center frequency. The USB energy is above that and fills the 2.8 MHz channel, and it's "one QSO per channel."
For CW, we are told to put our keyed RF signal *on* the channel center frequency. There is only one "center frequency" per channel, so again, it's "one QSO per channel." CW and USB seem pretty clear. The two data modes aren't quite as clear. "Data", as the FCC uses it is a 2K80J2D emission which wiki.radioreference.com defines as "HF PACTOR-III." Again, the emission fills the channel and it's "one QSO per channel." The FCC's "RTTY" is a 60H0J2B emission which radioreference.com defines as PSK31, which precludes what we hams define as RTTY [45.5 baud 170 Hz shift FSK]. What's not clear is where to place your PSK31 signal. If your PSK31 signal extends upward from your dial frequency, then the R&O seems to say you put your dial frequency 1.5 KHz below the channel center frequency. Where you actually transmit your PSK31 signal above that doesn't appear to be specified as long as it isn't 2.8 KHz or more, which is a little strange. Given the "one QSO per channel" philosophy for CW, Phone, and PACTOR-III, I would think that they would want my PSK31 signal centered in the channel and it would be "one PSK31 QSO per channel" like the other emissions. It just doesn't say that explicitly. There are several references in the R&O to various techniques for minimizing interference to Federal users, and that seems to be a driving factor behind the "one QSO per channel" requirement. If it's just me and you conversing, there will be natural, frequent breaks for a primary user to claim the channel. If the 60H0J2B emission type is intended to allow multiple QSO's within the channel, as happens now above 14070, there will be no breaks and no way for a primary user to claim the channel. I don't have the answer, if someone does I'd really like to hear it, but do I think we all need to be careful as 5 March rolls around. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org On 2/3/2012 7:14 PM, Rick Bates wrote: > Hi Sandy, > > If I read it correctly, we can use RTTY, Pactor and PSK modes (using USB if > AFSK) and are limited to 2.8 KHz. It said we were NOT limited to those > modes for data as it would suppress experimentation. ______________________________________________________________ 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
