Using FDX to set up your TX Audio

Mike-VA3MW

How to use the FDX feature to set up your TX audio.

As well, how to use the RX Equalizer to   your advantage.

73 all es GL!




https://www.youtube.com/watch?v=p79V9Nn8l0U

KD0RC

Thanks Mike, these videos really help us get the most from our Flex radios. NM9P also did a set of videos on this topic. He goes into some good detail, and I recommend them highly. 73, Len, KD0RC

w5ap

Mike
I never ever use SDR since I have a 6600m  other than save the profiles to a file
That being said, 
Would you please show how to adjust things in the 6600M screens as well as Smart SDR
tnx es 73

Mike-VA3MW

Let me see what I can do.  

However, the process is exactly the same and the antenna selection Icons are very similar.

Essentially:

• Set up 2 slices on the same frequency and same mode on a clear frequency -- I usually 10 meters
• On one Slice, select that as TX and reduce your RF power to 1 or 2 watts into a dummy load or resonant antenna
• On the other, receiving slice, set your volume and an RX antenna (blue) of XVTR or RXA or B -- what is key is that it is a different antenna than your TX Slice antenna
• Turn on FDX 
• Now, when you transmit, you will be able to hear yourself in the other receiver.

This picture covers the critical settings.   In this case, we are transmitting on ANT1 (Red) on Slice A and receiving on Slice B on XVTA (Blue) and then turn FDX on.

73

Keith WA0BEU

Thanks Mike, great info!

Paulo CT1ETE

Mike,

What happens if after using FDX I forget to set FDX off and use the same ANT on slice A for RX and TX in normal operation (100w)? As per Flex manual, it seems that even with FDX on, RX is muted if TX antenna is the same as RX antenna.

73

Paulo

KD0RC

That is correct Paulo.

Mike-VA3MW

@Paulo CT1ETE

You won't hurt the radio. It has protection circuits.

Keep in mind that every HF radio I know has RF coming down the antenna right to the front end amplifiers even if you are not receiving on that frequency. Even if the radio is off.

Think about it. :)

Paulo CT1ETE

Hi Mike,

Thanks for the reply. I was afraid because I think I saw some kind of calculation for FDX power to be used not to damage the SCU, but I believe that is with a different antenna on RX.

73 Paulo

Opathy

does full duplex work with SmartSDR for Mac? If so how. I know how to do it in Windows

Mike-VA3MW

The steps are the same, but the buttons are different. However, the last time I did it on a Mac, I did find it a bit of a challenge with VFO management.

The actual exercise is executed in the radio regardless of the client you are using. You just have to find the FDX button on the MAC.