Tokyo HY-power 1.2

For both Amps, the setup is the same and is described in the video.

You will need to look at the manual and confirm the PTT Keying Current and make sure it is low voltage such as 5 or 12V. Check section 7.17 of the Hardware Reference Manual.

https://www.flexradio.com/documentation/flex-6400-and-flex-6600-hardware-reference-manual-pdf/

You will have to manually change bands on the amplifier.

7.17 TX RELAY OUTPUTS [1,2,3]

TX1, TX2 and TX3 are outputs for keying external equipment such as amplifiers, external T/R switches, etc. They are isolated individual outputs. Refer to the SmartSDR documentation for an explanation on how to configure the timing for each output.

Δ – The TX Relay outputs are designed to handle signaling levels of up to +40 VDC @ 140 mA maximum. Some amplifiers do not have circuits to prevent keying voltage transients and older amplifiers may exceed the maximum voltage level resulting in damage to the radio if directly connected. Verify the voltage/current on your external device before connecting to TX Relay 1-3. FlexRadio highly recommends the use of a use a buffer/isolator box between the radio and the external device as a best operating practice regardless of the keying voltage.

Here is a great dummy load you should have (everyone with an Amp should have)

And, they have it in stock.