LH0ezVT

joined 9 months ago
[–] [email protected] 2 points 2 days ago

Sure, and money grows on trees

[–] [email protected] 16 points 2 days ago (3 children)

Yeah, I don't understand this either. If someone offered me to make me rich by paying him 10 bucks on the street, I'd tell him to fuck off and evaluate my chances in a fight and/or escape route. But as soon as a computer is involved, some people's brain shuts off or something.

[–] [email protected] 2 points 6 days ago (1 children)

People != their government

Except that they're still mostly a democracy, and they vote for the shit.

[–] [email protected] 9 points 6 days ago

Lobbying from a small nation with no money, resources or military power, that doesn't even buy our stuff and snuggles up to Russia for protection? I don't really see how that would work. It doesn't check out with the behaviour of US/EU other conflicts, like Israel or Armenia-Azerbaijan, where we immediately sided with the party that had oil/gas and bought our weapons.

I'm willing to have my mind changed, but the gut feeling doesn't really point that way here

[–] [email protected] 2 points 1 week ago (1 children)

You do realize that this hobby consists of nerds and pensioners, who sometimes spend thousands on being able to talk to other nerds?

If anything, you might need to politely stop people from over-sharing all the cool stuff they made.. :D

[–] [email protected] 2 points 1 week ago (3 children)

As always, the answer is "it depends" :D

Feel free to PM me or ask in a new post

[–] [email protected] 2 points 1 week ago* (last edited 1 week ago) (5 children)

10W at 2m, 70cm and 10m. Except for the 10m, which I have never heard anyone use (*), that fits pretty well with the idea of giving high school kids an aliexpress handheld to get them into STEM.

The ugly part is, you need to do the same regulatory and legal questionnaire that you need to do for the larger licenses.

"N Lizenz" in Germany, for reference

(*) I just remembered that 10m is basically CB, but Ham. So if you find/inherit an old CB radio and want to experiment, it might be a really cheap way into the hobby.

[–] [email protected] 3 points 1 week ago (7 children)

My country just introduced a super-beginners license that can be done with basic high school physics. Of course, severe limitations, basically, a "Baofeng license". Still great idea.

[–] [email protected] 2 points 1 week ago

The fuck? It seems I have been lucky. Most people here follow the "don't argue politics" advice.

[–] [email protected] 2 points 1 week ago

Check out a local club. Literally, check it out. If it is full of arrogant assholes twice your age, leave. If they are cool but you don't fit in, ask them for advice. There are so many retired radio operators who are doing it to stay "in it", or retired engineers who finally have time and so on. Most of them are very happy to info-dump about their hobby.

[–] [email protected] 2 points 1 week ago

It is fine for ham radio's original purpose: technical experimentation and connecting people. "Don't discuss politics' is a long-standing Gentleman's (woman's) agreement for a reason.

If you want to encrypt, go for the ISM bands. Lora, meshtastic, whatever happens at 433 MHz, hell even at 2.4 GHz a few 100mW will get you quite far with the right approach.

The difference is, your stuff will be type-checked. No experimentation, no building the crazy antenna idea that will be surelu fine according to your back of the napkin math.

[–] [email protected] 2 points 1 week ago

Unfortunately yes. People wanted this. They still want this. But people were also cheering for like, Mao even after he put millions of his own citizens into the ground, so who knows

 

cross-posted from: https://sh.itjust.works/post/34507515

How do you test your antenna idea? Well, our approach was to get a portable network analyzer that can show received dBm, put a commercial antenna on it, and strap the whole thing to a PVC pipe (for insulation and to get repeatable height). Then, zip-tie a cough drop to the PTT of a walkie talkie set to low power, so that it transmits continuously.

Now you can walk around your contraption with your Drain Pipe of RF measuring, and get a (rough qualitative) idea of how the pattern looks like. Much to my surprise, it actually worked.

 

How do you test your antenna idea? Well, our approach was to get a portable network analyzer that can show received dBm, put a commercial antenna on it, and strap the whole thing to a PVC pipe (for insulation and to get repeatable height). Then, zip-tie a cough drop to the PTT of a walkie talkie set to low power, so that it transmits continuously.

Now you can walk around your contraption with your Drain Pipe of RF measuring, and get a (rough qualitative) idea of how the pattern looks like. Much to my surprise, it actually worked.

15
submitted 3 weeks ago* (last edited 3 weeks ago) by [email protected] to c/[email protected]
 

Picture from a hike back in January. I need to go outside more often ;)

 

cross-posted from: https://sh.itjust.works/post/29055031

My first magnetic loop for 2m :)

Really simple construction: bent ca. 2mm brass pipe soldered directly to the outside of an SMA plug, inside of the plug soldered to the red wire as "input coil". Tunable by squeezing the ends more or less close together.

SWR of <1.2 at resonance, not bad. Impedance is at roughly 44+j2 Ohm, also not bad for totally eyeballing it without any prior calculations.

I can reach the nearest 2m relais just fine at 2W, although to be fair I can do the same with a short whip antenna. More testing to follow. Holy shit, this actually works!

 

My first magnetic loop for 2m :)

Really simple construction: bent ca. 2mm brass pipe soldered directly to the outside of an SMA plug, inside of the plug soldered to the red wire as "input coil". Tunable by squeezing the ends more or less close together.

SWR of <1.2 at resonance, not bad. Impedance is at roughly 44+j2 Ohm, also not bad for totally eyeballing it without any prior calculations.

I can reach the nearest 2m relais just fine at 2W, although to be fair I can do the same with a short whip antenna. More testing to follow. Holy shit, this actually works!

 

It will widen your horizon, they said. And here I was, foolishly thinking I could get away with half-assing statistics during my degree.

 

Turns out the status quo of Linux memory management somehow works pretty damn okay, nobody seems to really know why, and nobody cares.

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