Ham Radio / Off-grid communication

Are you active in the ham hobby? Do you have an existing setup?
What interests you?

sorta need more to go off of lol
I just got my general. I went from tech to general in one day (took both tests after doing one of those "weekend zero to tec" classes. I have a trade set up with a friend where in exchange for a very fancy bike, I will get a gently used 7300 an HF-010 antenna from a friend, and a red LDG box thing and a blue LDG box thing and some coax, a power supply and an external tuner but it is arriving probably in November/December realistically (he wants to hand deliver it to me but gave me the gift card so we can make the trade happen earlier). Open to everything but a full desk top home shack is currently unlikely due to me travelling a lot for work.

Also what is this new xiegu thing going on? And what's this flex radio people keep talking about it seems like a very expensive hf radio.

I do own a baufeng uv-5r but I'm open to digital modes. Oh and I have some triband baufeng thing but I can't seem to listen to airplanes with it.
 
I just got my general. I went from tech to general in one day (took both tests after doing one of those "weekend zero to tec" classes. I have a trade set up with a friend where in exchange for a very fancy bike, I will get a gently used 7300 an HF-010 antenna from a friend, and a red LDG box thing and a blue LDG box thing and some coax, a power supply and an external tuner but it is arriving probably in November/December realistically (he wants to hand deliver it to me but gave me the gift card so we can make the trade happen earlier). Open to everything but a full desk top home shack is currently unlikely due to me travelling a lot for work.
That's pretty much a shack in the box right there. The red LDG thing is a 9:1 unun and the blue LDG thing 1:1 is a choke/balun btw. The 9:1 unun the red box is used for building a random wire antenna. If you attach a length of wire that isn't resonant on a band like 35.5 ft (10.8 meters) or 71 ft ( 21.6 meters) and throw the end up in a tree or on a mast you get an antenna that can work 40 - 10. Also add some counterpoise wire like 20 ft or so that can just lie on the ground.

I just skimmed thou,gh the Radioddity site and if you don't have a NanoVNA for measuring SWR I'd pick one of those up:


Vital for any type of antenna building. You can use the 7300's built in SWR meter but it's not advisable and a lot more convenient to have a device that can measure antenna characteristics standalone.

Also what is this new xiegu thing going on?
I actually just saw that for the first time checking their site. Very excited to see a 100 watt Xiegu radio. Just as long as it has a price advantage to something like a Yeasu or ICOM, otherwise I'm not sure its worth it.

Btw, I'd build a random wire if you have space to run it and can get the end or feedpoint high enough instead of using the HF-010. A lot easier to deploy than a vertical IMO, but you do need some space for it
(Invidious)
 
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That's pretty much a shack in the box right there. The red LDG thing is a 9:1 unun and the blue LDG thing 1:1 is a choke/balun btw. The 9:1 unun the red box is used for building a random wire antenna. If you attach a length of wire that isn't resonant on a band like 35.5 ft (10.8 meters) or 71 ft ( 21.6 meters) and throw the end up in a tree or on a mast you get an antenna that can work 40 - 10. Also add some counterpoise wire like 20 ft or so that can just lie on the ground.

I just skimmed thou,gh the Radioddity site and if you don't have a NanoVNA for measuring SWR I'd pick one of those up:

I actually got one because I thought I would use it to listen to short wave radio (i wanted to make some antenna at one point)- never used it tbh.
I actually just saw that for the first time checking their site. Very excited to see a 100 watt Xiegu radio. Just as long as it has a price advantage to something like a Yeasu or ICOM, otherwise I'm not sure its worth it.
Hmm so seeing how I have all my bases covered. What should I get with this gift card?

How is the uv-25 or the uv-25 plus or the DM-32UV?
 
Hmmmm. Xiegu G7250. Going to wait and see what the price is on that front. The pre-owned market for second hand HF gear is reasonable if you know where to look and I'd be more inclined to pop for a used Yaesu or Icom if the prices were similar. It's simply because the support ecosystem is there for those brands;Yaesu customer service is fantastic.

There's a Baofeng DM-1701 on there at approx $70 and they openly state they're selling a model that runs OpenGD77. If you don't mind the lack of GPS and want a DMR radio, that's probably worth a look.
 
Hmmmm. Xiegu G7250. Going to wait and see what the price is on that front. The pre-owned market for second hand HF gear is reasonable if you know where to look and I'd be more inclined to pop for a used Yaesu or Icom if the prices were similar. It's simply because the support ecosystem is there for those brands;Yaesu customer service is fantastic.

There's a Baofeng DM-1701 on there at approx $70 and they openly state they're selling a model that runs OpenGD77. If you don't mind the lack of GPS and want a DMR radio, that's probably worth a look.
What is so good about open GD77?
 
What is so good about open GD77?
From stuff I've used personally: APRS beaconing, the promiscuous mode features are nice when trying to pick out the colour codes on the local tier 3 network, manual talkgroup entry (not having to preprogram your radio is wonderful), improved radio UI (you can edit stuff on the handy rather than having to hook it up to the cps). It's a big quality of life improvement over the factory interface on the DMR hardware I've tried. There's a lot I've not played with (iirc there's features for ISS doppler in there).
 
I'm working on a fun demo program for my open source HF + VHF/UHF modem project, modem73, that lets you send drawings over the air. Here's an example on the HF 20 meter band using the ROBUST RDM-600 mode @ 585 bits per second sending a drawing over a distance of 7800 km.


It stores the drawing as vector stroke data then shoves it through zstd for compression and sends it off to the modem's queue.

I'd like to build this tool out into a full multimedia sharing tool someday. Maybe even support for all sorts of formats like SVGs, 3D scenes, or even something a multimedia format like Decker.

You can also send JXL images up to 3-5 kilobytes depending on which mode you have selected in modem73, so your usable throughput becomes your "canvas" size
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I'm working on a fun demo program for my open source HF + VHF/UHF modem project, modem73, that lets you send drawings over the air. Here's an example on the HF 20 meter band using the ROBUST RDM-600 mode @ 585 bits per second sending a drawing over a distance of 7800 km.

modempix2.webm
It stores the drawing as vector stroke data then shoves it through zstd for compression and sends it off to the modem's queue.

I'd like to build this tool out into a full multimedia sharing tool someday. Maybe even support for all sorts of formats like SVGs, 3D scenes, or even something a multimedia format like Decker.

You can also send JXL images up to 3-5 kilobytes depending on which mode you have selected in modem73, so your usable throughput becomes your "canvas" size
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How is this different from SSTV? I mean fundamentally?


Cool project btw! Is it an active drawing experience or a static one?
 
How is this different from SSTV? I mean fundamentally?
SSTV modes are more of an analog format similar to fax where you transmit RGB pixel values line by line. Martin M1 for instance takes 114 seconds on air because you are sending sequentially 256 scan lines using a color sequence of red, green, and blue. Those scan lines are then modulated into sound tones in a frequency range that represent their values which is what you are hearing when you work SSTV.

This on the other hand is a demo for my project, modem73, which lets you send any type of arbitrary data from any program using OFDM modulation. My project is itself a derivative of the open source COFDMTV modem which was also used in a project for sending pictures not as representations of color values but as digital data.

You are not limited to just pictures and what not either. This is just a demo. I'm testing some bulletin board system software with someone right now over 20 meters and it seems to be working great.

The end goal is to offer a seamless VARA replacement but with the ability to support multiple concurrent users in a channel which is something that no other packet modem currently offers. I have spent the last 3 months fine-tuning the CSMA (carrier sense multi access) so that you could have a "net" of people doing packet stuff versus the a 1:1 link that is the current limitation of things like PACTOR and VARA, with any type of ARQ handled via whatever program wants to implement their own deal for that.
 
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