Spectrum DSP M2 User Manual V1.1
VFO A (or VFO B):
When not in Menu mode, the [VFO A/B] button toggles which VFO, A or B, is currently in use.
This display will change, always indicating the currently-active VFO.
If SPLIT mode is not active, the currently active VFO's frequency, filter selection and mode
are used for both receive and transmit.
SPLIT mode:
To activate SPLIT mode make a long-press on the [SLIP/SP] button. When active the current
VFO's frequency and filter are used for receive while the “other” VFO's frequency is that used
for transmit: The transmit mode is always that of the “active” (receive) VFO. The SPLIT
mode will be discussed in more detail below.
When SPLIT mode is on, the radio uses the currently-selected VFO's mode for both receive
and transmit, the current VFO's filter and frequency for receive and the “other” VFO's
frequency for transmit. In this mode, the main frequency display is also changed, showing
both the receive and transmit frequency, separately.
To set up for SPLIT mode one might do the following: (transceiver dependent function)
• Activate the SPLIT function by long-pressing [SLIP/SP]. The display now shows two
frequencies.
• Suppose that a DX station is transmitting on 14.155 and receiving on 14.165, USB. In
that case, you would transmit on 14.165 and receive on 14.155.
• Tune to your transmit frequency of 14.165 MHz – the receive frequency of the DX
station.
• Press the VFO A/B button to move that frequency to the “other” VFO: That is now your
transmit frequency.
• Tune to your receive frequency of 14.155 – the transmit frequency of the DX station –
and also set USB mode and your desired filter bandwidth.
• You are now ready to go! - It doesn't matter which frequency is in VFO A or B.
Important Comments related to SPLIT mode and VFO A/B:
• The SPLIT mode works only on the same band – this to prevent the destructive
battering of the band-switch relays that might occur with crossband operation – which
would also slow down transmit/receive switching.
◦ Note that it is possible for one to set the STEP to 100 kHz and using the main knob
to tune the receive frequency to another band and operate split that way, but this is
not recommended and you do this at your own risk!
• When using FM mode it is possible to use the SPLIT function for repeater operation if
one VFO contains the repeater input frequency and the other contains the repeater
output frequency. By “swapping” the VFOs one may also do a “reverse” function and
listen to signals on the repeater's input frequency.
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