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Re: Need Guide to Use FT-847 For Digital Modes

 

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Yep, that's pretty much what I wanted to do as well, but driven from a Raspberry Pi 4B.? Got it all wired up, and it failed miserably.? The problem?? No transmit audio.

Bottom line is that the 847 appears to want to be "smart".? When the rig is keyed, where should it look for the audio to transmit?? The apparent decision was to follow the connector where the PTT was signaled.? If keyed from the TRS jack (for the HF modes), take it from there and mute the others.? If from the DIN connector (for VHF / UHF packet), take it from there.? The problem:? Where to look if the rig is keyed from CAT?? The unfortunate answer:? The mike.? I can't fathom why they would look to a hand mike's audio for a rig keyed by a computer, but there it is.? Pretty dumb for a smart rig, if you ask me.

So the answer to your challenge is to somehow have the two back connectors key the rig when their particular port is being fed audio from the appropriate software.? In my case, FLDIGI goes to the TRS, Direwolf to the DIN.? I managed to cobble things together with several switches to route the audio and PTT to the right place, and that seem to be working.? Do note that the TRS jack overloads the line-in with the PTT function, requiring a resistor and DC blocking capacitor, while the DIN has a separate pin.? There's also the separate 1200 and 9600 baud pins on the DIN to deal with.? You CAN use the CAT for changing frequency, just not for PTT.

No clue about the external amp, as I don't have any.? If someone could document all this in a cohesive way, that would be wonderful.

Good luck!

Greg? KO6TH


Micky Corrow wrote:

Greetings.

I know it probably has been discussed an unknown number of times previously, but I want to start using my 847 in the digital modes, both on HF as well as 6M + VHF/UHF. I want the members here to create the Ultimate FT-847 Digital Guide.

Let me take a moment to describe my setup - I have separate antennas and amplifiers for each output on the 847. Each amp is hard-keyed by the 847, via a special breakout cable I obtained on ebay. It works great. I don't want to use the mic input on the front of the radio for data, I have a mic connected there and I don't want to be switching cables for different bands.

I have a laptop running JTDX and FLDigi, I would like to use CAT control to manage frequencies, but it is not cast in stone. I know how to push buttons and spin the dial... I use Log4OM v.2 for logging, and I use JTAlert for needed entities alerts. I have all three (minus FLDigi) apps integrated with each other to work seamlessly. The big unknown is the FT-847.?

I would like suggestions on how to integrate the computer with the radio so that I can feed it from the ports on the back and manage the drive and the ALC from the front. The laptop has an internal sound card that I feed some speakers with to hear the alerts, and an inexpensive USB sound card to feed the radio. If at all possible I would like to use CAT control to switch frequencies and modes, but so far that has been problematic for me, so suggestions there wouldn't hurt.

In the end I would like to compile all the suggestions and guides into one document and upload it to the Files section so that others don't need to reinvent the wheel each time they dig into digital with the FT-847.

Thanks in advance.
Micky K1XH?

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