New To Flex and Trans power

Ron - a few suggestions. (And sorry if some of this sounds obvious, as I don't know where you are with your learning curve.) First, make sure the "TX" on the Receiver Slice Flag that you have selected is Red (not grayed out). Also make sure the Receiver Slice is tuned inside the ham bands. Next connect the output of your 6400 to a dummy load, switch your ATU into the bypass mode (you should see "Success Byp"), then adjust your "Tune Pwr" slider mid-way, then click your Tune button for a short period. You should see a mid-scale RF indication on your RF Pwr meter, and SWR should be at or near zero. This will let you know if your transmitter section is working properly. Next test your ATU. Reactivate your ATU, and click on your TUNE button again and look for approximately the same power out with little or no SWR. Next adjust your RF Power Slider mid-way, select an active Microphone Profile and then its proper MIC connection (Mic, Line, etc). Key the PTT button on your MIC and speak into your Mic. If you are in the USB or LSB mode you should see RF Peaks indicated on your RF Pwr Meter as you speak.

KF4HR

It looks as though you are not pasting the image from the clipboard.

Just right click in your reply and choose Paste or use ctrl-V.

You should see the image not a file name.

As a test I'll try something.

Random snipped image pasted in my reply...

OK, well that worked. I'm not sure what else I can tell you. Perhaps someone else can chime in.

At the bottom left of the reply window there is an icon for uploading an image. Perhaps that will work.

Ron - a few more things to try... Note your ATU "MEM" button is blue, click it and gray it out, then make sure your ATU indicates "Byp" then click on the TUNE button and retest your SWR into your RF Load. If your SWR drops to 1:1, make sure your Mode (on the Frequency Flag) is set to LSB or USB before you do your Mic test.

Also, if your Frequency Flag is indicating ANT 1 (blue, meaning receive) and ANT 1 (red, indicating transmit), make sure you have your RF output cable connected to the ANT1 port on the rear panel.

KF4HR

The notes you were given were all good. Especially check:

Often missed is Ant 1 is the inner of the PL259 connectors - See fine print on the back

Do a resistance check on your dummy load connecting cable - You didn't reply that you had a dummy load or it's type. The centre and shield should be 0 ohms end to end and not shorted together; I have seen many failed cables and connectors.

Measure the DC resistance of your dummy load for 50 ohms A) at the dummy load and B) with the cable connected.

Apologies if these statements are insulting, just trying to be all inclusive. The Flex SWR is calibrated 1:1 to 3:1 full scale. If you have a separate SWR bridge put that inline so you can independently see power and SWR.

If the cables and dummy load are good then cycle through the ATU settings (bypass and tuned). With a short pressing of the ATU button you should hear some clicks and the SWR reading adjust. When in Tuner bypass your external SWR should match the Flex SWR reading.

The most important readings are, on your inline swr/power meter, a power reading near your Tune % slider. Failing that repeat the test on Ant 2 to isolate that part of the flex power routing relays.

Time for a help desk ticket. They can access your rig to check on all settings , etc. very knowledgeable and helpful.