CI-V commands for IC-7400 and switching antenna on RX/TX

Hi Irad,

many thanks this works well with some conditions:

For TX/RX during a QSO or when transmitting beacon it works 100%.

Only when I type the button "Tune", it fails. It changes to ANT1 and not back to ANT2. Can be, that this use the VARA-Tune function and is implemented differently.

But knowing this, it works fine. Now it is on me to improve my RX-antenna for the lower bands.

Many thanks Irad!

If anyone know how to implement this idea inside HamRadiDeluxe 6.0.x feel free to let me know.

73 de Maik DL4DTL

There should not be any difference with TUNE. Can you check if it is consistent or simply random ?

Hello Irad,

I checked the behavior of TUNE again:

It depends on the transmission power whether it works. As soon as the power is above approx. 30W, PTT switches, but not ANT1/ANT2. Sometimes ANT1/ANT2 switches correctly again after approx. half a minute.

I had observed this before, that the CAT control is influenced by RFI(?). That's why I usually set the PTT via DTR/RTS.CAT and PTT then share the same COM port.

I have another CAT interface, which is possibly better shielded and provides separate virtual COM ports for CAT and PTT. I will get the cables to the TRCV for it.

Conclusion: Your program does it right - the problem lies in the hardware :)

Many thanks,

73 de Maik, DL4DTL

yes, that is what I like to do.

It is for 80m/40m where I like check a separate RX antenne on ANT2.

73 de Maik