Spectrum DSP M2 User Manual page 35

calculate the actual transmit frequency.
LSB – The receiver operates in LSB and the transmit frequency is below the
•
displayed frequency by the amount of the configured sidetone frequency (e.g.
menu parameter "CW Side/Off Freq"). One must do some mental math to
calculate the actual transmit frequency.
AUT USB/LSB – In this mode USB is selected >= 10 MHz and LSB is selected
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below 10 MHz.
USB DISP – The receiver operates in USB but the displayed frequency shifted
•
upwards by the amount of the configured sidetone frequency. The displayed
frequency is that of the transmit frequency and it is the frequency of the received
signal if it is tuned to match the pitch of the sidetone.
LSB DISP – The receiver operates in LSB but the displayed frequency shifted
•
downwards by the amount of the configured sidetone frequency. The displayed
frequency is that of the transmit frequency and it is the frequency of the received
signal if it is tuned to match the pitch of the sidetone.
AUTO DISP – In this mode USB DISP is selected >= 10 MHz and LSB DISP is
•
selected below 10 MHz.
USB SHIFT – The receiver operates in USB. Compared to normal USB for SSB
•
operation, the receive frequency is shifted down and the displayed frequency is
shifted up by the amount of the configured sidetone frequency which causes a
CW note that would be zero-beat in USB mode to be heard at the pitch of the
sidetone frequency. The displayed frequency is that of the transmit frequency
and it is the frequency of the received signal if it is tuned to match the pitch of
the sidetone.
LSB SHIFT – The receiver operates in LSB. Compared to normal LSB for SSB
•
operation, the receive frequency is shifted up and the displayed frequency is
shifted down by the amount of the configured sidetone frequency which causes
a CW note that would be zero-beat in LSB mode to be heard at the pitch of the
sidetone frequency. The displayed frequency is that of the transmit frequency
and it is the frequency of the received signal if it is tuned to match the pitch of
the sidetone.
AUTO SHIFT – In this mode USB SHIFT is selected >= 10 MHz and LSB
•
SHIFT is selected below 10 MHz.
Comments on the various modes:
The "USB" and "LSB" modes are equivalent to those found on many older transceivers such
as the Drake TR-7 in which the transmit frequency was shifted from the receive frequency. In
these transceivers the actual transmit frequency is calculated by adding/subtracting the
known frequency offset from the dial frequency.
The "USB DISP" and "LSB DISP" modes are equivalent to those found on current
transceivers such as the Yaesu FT-100, FT-817, FT-847 and FT-897 to name but a few with
the "USB DISP" being equivalent to the "CW" mode and "LSB DISP" the same as the "CW-
R" mode. In these modes the radio's frequency is not shifted, only the display is offset by an
amount equivalent to the sidetone frequency. The displayed frequency is the actual carrier
frequency of the transmitted signal and that of the received signal if it is tuned so that its pitch
matches that of the sidetone.
The "USB SHIFT", "LSB SHIFT", and "AUTO SHIFT" operate by shifting both the local
Spectrum DSP M2 User Manual V1.1
P 35