开云体育

Hello all!

I'm looking for a minimal Hellschreiber setup for portable use. There are arduino based encoders but I'm finding very little for decoding aside from fldigi. If this needs to run on a raspberry pi with command line flags that's fine but is there anything lighter? Must be linux please.

This sounds like a fun project. Can you explain more about what you mean by lighter, though? I perceive that fldigi on a pi is pretty light (I even have a couple pi model 2s that run fldigi full time. One has been running for 330 days!), but I might not be understanding what you're trying to accomplish.?

Lighter weight might look like a Pi Zero 2W, but then you might have to add a micro USB hub, which detracts from the tiny form factor of that machine.

Good question, I should have specified. I meant light from a user input standpoint. This is a long shot but ideally there's a tiny program out there that only does hellschreiber and has next to no options. Just a screen that displays the decode and a place to enter text to be encoded. This would be great in the command line if it wasn't a visual decode mode. Ultra respect to whoever makes an ascii text display for hell in the command line haha.

The ideal hardware is something like those LoRa messengers that are popping up with tiny keyboards and screens. The idea is to equip something like that with a 3.5 mm audio jack to receive audio from a CW radio and a second 3.5 to put in place of the morse key. Bingo, you're now running digital on a cheap QRP cw kit.

DigiPi with one of those TFT displays?

Joel - W4JBB

I have built something similar on my channel - the terminal element - linked in my bio. It's not exactly what you described, but you might find some ideas there. I have one system I keep in my backpack that's just a small battery, a Pi, a digirig sound card interface, and a VHF radio. The GUI is accessed by my cell phone through a VNC connection over an off-grid wireless access point.?

I didn't think about the digipi, good call!

And TE, your stuff is right up my alley man!

Since we're sharing things, here's what's in the back of my mind for this project. I'm leaning toward CW (not necessarily Morse Code...) but if the hardware could be super basic it might be a nice way to communicate with high SNR but a low learning barrier. Hell is CW so a little keyboard and screen with the plugs as described could fit into any kit radio and give good results. There's a lot to work out and you are seeing this in the middle of chasing down the feasibility of some ideas.

https://github.com/K3KDW/WildernessProtocolExtended

I couldn't tell from your link about the wilderness protocol, but which band and modulation are you planning to use as primary? I ask because I recently did some weak signal testing with various fldigi modes on VHF FM, and THOR 4 & THOR Micro blew FM CW out of the water (although I admit there could be something I'm doing wrong).

If you're doing CW on HF, I really like my Tru SDX. It has a CW decoder, and the PTT button sends CW. I know the developer recommends against relying on it for life safety, but I think it has a place in the back country for being so light, compact, and having such low power consumption.?

What draws you to Hellschreiber? I think it looks fascinating. I need to try it out. I just wonder how many people would be monitoring HS in a back country emergency.?

2m and GMRS are FM analog since that’s by far the most common (I should add that in), 10 meters is USB, and 40 is CW. None of these options should be relied on for primary assistance but between staying in touch (with someone at least) and offering an easy backup it has a place in most people’s plans. I don’t think Hell has a place but it’s an interesting idea to chase down. It would be a nice rag chew option for those away with minimal gear.