The ARRL posted this today, 60 Meters: One Week Later, and attempted to clarify PSK31 operation on the channels.
To have a PSK31 signal transmitted on the center frequency, the control operator should not set the carrier frequency to the center frequency but should instead set the carrier frequency 1.5 kHz below the center frequency (i.e., the same as for phone and data emissions).
OK, I follow that. But they lose me here:
The word ‘carrier’ in this context means the suppressed carrier frequency of a transceiver when operated in the USB mode, but some have taken it to mean the PSK31 signal itself. They read this text and come to the conclusion that the PSK31 signal should be 1.5 kHz below the channel center. They are mistaken. The PSK31 signal must be in the center of the channel.
Let me see if I can sort this out. So if you are centered on a frequency and transmit on the USB, your carrier is 1.5 kHz below the center, but you are technically still “on center.” So perhaps some data operators are tuning down 1.5 kHz, from the center frequency, then transmitting on the sideband, which would then place them another 1.5 kHz off where they should be? Argh… who’s on first?
For the record, here are the frequencies of the five channels:
- Channel 1: 5332.0 kHz
- Channel 2: 5348.0 kHz
- Channel 3: 5358.5 kHz
- Channel 4: 5373.0 kHz
- Channel 5: 5405.0 kHz
Channel 5 is used mainly for sideband DX.