Try going into the memory mode vs doing it from VFO. Only have the main channel on vs both main and sub. Find an empty memory channel and then do your frequency and custom offset. Click on the screen where it says MEMO and the number. You will then get a sub menu pop up. memory should be highlighted. Press and hold MW. You will now have that frequency and custom offset in that memory slot.

The SPLIT, A/B, and XFC buttons don't function in Memory mode. You must be in VFO mode to set up a custom split. I followed the memory store key sequence you wrote, starting in VFO mode. The memory store sequence is successful but only the VFO A frequency is stored. The offset is not stored.

Fortunately it's trivially easy to manually tune to 145.8 MHz, tap the SPLIT button, then hold the XFC button and dial down to 144.49 MHz. Unfortunately I can't save it in memory.

I find that manually dialing up 145.8 MHz is easier than the multi-key process to transfer that frequency from a memory to VFO A. That effectively makes the memories worthless for the ISS custom offset.

My objective was to store the ISS voice frequency pair in memory to include the ISS in a repeater scan list. I will keep the ISS voice downlink in the scan list to improve my chance of hearing random voice operation. But I must scramble to set up the uplink if I hear something.

I don't have the CAT interface working yet but plan to soon for SatPC32. I know that SatPC32ISS is the best solution for the in-band custom offset because it also includes Doppler tuning. I never used the satellite memories in the FT-847 and don't plan to use them in the IC-9700. SatPC32 has been my "satellite memory" for 20 years. InstantTune before that.

Thanks for everybody's suggestions.

73 de Wayne Estes W9AE