On HF radios operating split means you are transmitting on one frequency and receiving on another. This is beneficial when pileups become large and unruly. Often, hunters or people wanting to work a station (activator or DX) will step over themselves so much that the activator can no longer pick out call signs and the hunters are transmitting so much that no one can hear the activator. Running split keeps the activator’s transmit frequency clear and the activator can vary their receive frequency up and down a little to pick out individual calls.
When an activator decides to operate split they add something like “up 2” to their CQ or QRZ. What that means is they are transmitting on one frequency and receiving on another. Typically CW split is 2 kHz and SSB is 5 kHz. For example, if an activator is transmitting on 14.064 mHz and calls “up 2”, they are receiving on14.066 mHz. The activator can now vary his receive frequency a little to pick out call signs while all the hunters can listen to the one frequency the activator is transmitting on. The hunt is finding the frequency the activator is listening on. Smart activators will move up and down a little to reduce the pileup.
For activators, the split setup is a little different than for hunters. Activators may start out on simplex and then decide the pileup is more chaotic than they can handle. When an activator decides to split he is starting out with the transmit frequency. Hunters on the other hand start with the receive frequency which will be discussed later. For activators, I suggest the following for the FTDX10. Push the A/B button until VFO B is the same as VFO A. Press the split button and then use the Main tuning dial to set the receive frequency.
This will give you the “up 2”. The radio sets VFO B as the transmit frequency and VFO A as the receive frequency. This allows the main tuning dial to change the frequency of VFO A.
For hunters, it’s a little different. Hunters start out on the receive frequency. A hunter hears an activator on 14.064 calling for “2 up”. The easiest way is to dial in the receive frequency, touch the A/B button to equalize the VFOs, and then briefly press the Split button. Use the MPVD (outer) tuning ring to adjust the transmit frequency. Be careful not to hit or bump the main tuning dial. You can also use the Quick Split Option. To use it, set the receive frequency in VFO A and press and hold the Split Button. This will add (or subtract) the offset programmed in the radio. To change the offset, press the function button and go to the Operation Setting menu and then to the General Tab. Scroll down to the Quick Split Freq. Typical offsets are 2 kHz for CW and 5kHz for SSB. The offset can still be adjusted by the MPVD.
Now let’s talk about Icom and in this case the IC-7300. The Icom does not offer a built-in split offset like the Yaesu. As an activator, you start your activation on one frequency 14.064. When it is time to go to split operation.
Press and hold the Split button until VFO B equalizes with VFO A.
This sets up VFO B as the transmitting frequency. Turning the main tuning dial will change the frequency for VFO A, the receive frequency.
For hunters. Set the receive frequency 14.064 and then Push and hold the Split button until the VFO’s equalize. To set the transmit frequency (up 2) push and hold the XFC button under the Multi-Function Knob and using the main tuning dial, set the transmit Frequency. Every time you wish to alter the transmit frequency you have to push the XFC button.
Icom does have a Split Lock function which locks the receive frequency. To enable it, go to menu > Funtion > Split > Split Lock and turn it on.
While in Split Mode if you push and hold the Speech/Lock for one second, you will lock the main tuning dial so you cannot change the receive frequency. You can still alter the transmit frequency by pushing the XFC button and turning the main tuning dial. You will see a little key by the hertz numbers
That’s the basic how-to for split operation. It can be a little confusing. Shown here are the FTDX10 and the Icom IC-7300. Different models from each manufacturer should be similar. Which one is better, that depends. I think in general, when it comes to split operation, it’s a toss-up. I like things from both manufacturers. In general, I find the ergonomics of the IC-7300 better than the FTDX10 however, for split operation, the FTDX10 may be a little easier.