Frequently Asked Question

Why can't I track the RX and TX frequencies with my ICOM radio?
Last Updated 5 years ago

Icom VFO B Display Issue

All rigs use a set of commands to control their functions. The command set is usually included in the operating manual for the rig.
Any software needs to use these commands to control the various functions of your rig.
Icom, has elected NOT to include commands in all their rigs to directly address VFO B or the Sub VFO. This makes it difficult to impossible to display or control VFO B. Some software authors have decided to use a kluge of sorts to work around this issue. They do this by sending the command to swap VFO's - that is, the frequency in VFO A becomes the frequency in VFO B and vice versa. The rig control program then reads the data from VFO A and stores it as VFO B. It then swaps the VFOs back to the initial frequencies. This takes a few microsecond to seconds depending on your Rig/Computer/Link speed and what data is being shared on the control bus (remember Icom CI-V is a shared serial data bus).

This is an important consideration as it will interrupt the signal being received on VFO A for that period of time it is swapping back and forth as well as getting the data from the rig. It would make copying data or CW signals impossible as they would be constantly interrupted for an update of the frequency in VFO B. While that update may be a very short period of time, it would not be consistent or predictable.

HRD has elected NOT to place this kludge in it's software because of this reason with the exception of the IC-9100. The IC-9100 in Satellite Mode (ONLY) will perform this swapping of VFOs as it is necessary for satellite work and the IC-9100 has individual audio outputs for the two VFOs.

It's important to realize this is a shortcoming on the part of Icom by not including these commands.
All attempts to work with Icom to address the issue have met with denial of a problem from Icom.

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