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The only required connections are --? RF In and RF Out and PTT (Push to Talk).??

What the above is saying, besides your RF IN/OUT you are only required to have a PTT.?? You can see at the bottom of the below graphic, this is stated, and I got this from the la-1k manual.?? If you are a FTDX10 Owner, keep reading because there is bad news :)?

To answer your question, Yes, it will work with just the PTT along with RF IN/OUT, and work just fine.

The FTDX10 does not have a RCA input/output for PTT, so once again we are kinda stuck either making a cable or buying a cable.?

In my opinion the band switching cable works a little better for 2 reasons.

1. The band switching cable is considered "Direct Mode Keying" and the RF delay is a little shorter using this method.

2. I use a Trans-match (ATU), and the amp Automatically kicks me into Standby when I switch bands.? This is opposed to using PTT cable, which I the operator have to remember to put myself on standby before transmitting to tune on a different band.

Bottom Line?? Either you use the PTT RCA cable OR the Band Switching cable.? Not both.

Hope that helps,

David