[Elecraft] KAT500 when used with KX3 and KXPA100

[kevino z]

My nominal setup is KX3 -> KXPA100 -> KPA500 -> KAT500.
Normally, my KX3 ATU is in bypass, and the KXPA100's tuner is too. The KAT500 does all of the matching. But when I want to operate in QRP, do I throw the KAT500 in bypass, turn off  the KXPA100 (by the menu in the KX3? by the switch on the KXPA100?) and use the internal tuner in the KX3?

I have seen that the QRP levels are not enough to engage the relays in the KAT500, and I want to use band hopping on WSJT-X WSPR mode.

thank you for your advice.

Kevin (KK4YEL)