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8Petros [$ rm -rv /capitalism/*]udostępnił to.


They've stopped asking... 😜
Ten wpis został zedytowany (2 tygodnie temu)

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in reply to harc

może trzeba jakichś poważniejszych kar za nieszczepienie własnego dziecka bo jak widać kara pieniężna nie podziałała na rodziców których stać na wyjazd do Afryki

8Petros [$ rm -rv /capitalism/*]udostępnił to.


I also experimented with different antenna designs today.

While following the same principle by using irrigation hose/parts and tape measure, I experimented with a dipole and 2 to 4 element Yagi designs. This is by far my favorite design: dipole with reflector (2-element Yagi).

Measuring it inside my apartment, it showed a front-to-back ratio of about 13 dB. Which is close to commercial antennas.

This will become the reference-design with option for an additional director.

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in reply to DK4HAA - Harm

Is the coax directly connected to the driver elements? Would you mind sharing the dimensions you used for elements and spacing? Thx :)
in reply to F4LUB

@F4LUB It's a dipole, so there is a slot in the center. Coax is directly connected, yes.

Dimensions are: reflector 355mm @ position 0mm. Dipole 310mm total length @ 70mm (center to center from reflector). Using 12.5mm tape it's 57.5mm edge to edge. But that dimension is not critical. I saw designs ranging from 70 to 160mm center/center.

I used the lower end of that distance to get the antenna as small as possible.

You can add a director (304mm @ 175mm from center or reflector)

in reply to DK4HAA - Harm

I have a PCB incoming for the dipole. So you can solder both ends to the PCB and get a rigid connection. It also has an edge mount SMA connector.

I'll post updates as soon as it arrives. It it works, I'll share the Gerber-files, so you can make your own.

Ten wpis został zedytowany (2 tygodnie temu)
in reply to F4LUB

@F4LUB Impedance is not that important here, because it's RX only.

Impedance is influenced a lot from the surrounding, too. I get no real good reading. As soon as I move or come closer to things, it's all over the place. So not the best for TX (but I'm sure it would work).

But works for RX perfectly.

I'm painting a plan right now. Stay tuned.

in reply to DK4HAA - Harm

Bummer, of course... I have not yet many years of practice... :alex_grin:
And the three elements may improve the directivity of the antenna so I'll
try both.
Ten wpis został zedytowany (2 tygodnie temu)
in reply to DK4HAA - Harm

Use with caution. It's late and did not double check the dimensions yet. Let me know, if there's something I can improve in the diagram.
Ten wpis został zedytowany (2 tygodnie temu)
in reply to DK4HAA - Harm

@F4LUB Some more details. I use 3mm threaded rod inside the center of the tubing to get rigidity. Everything else is fixed to it with heat shrink tubing. I'll use glue lined hear shrink at the tape measure/cross connectors. And then normal heat shrink as protection against the sharp edges.
in reply to DK4HAA - Harm

Thanks a lot. I understood that the spacing between elements has an impact on the impedance. But I have the same HT as you, so if it works for you it will work for me :)

I just build a 2m 3 elements and it was long-ish to tune so I think I will go for two elements to start with :)

Ten wpis został zedytowany (2 tygodnie temu)

8Petros [$ rm -rv /capitalism/*]udostępnił to.


The whole experience of the fedi is just yelling "hey nerds, I found something interesting..." into the abyss and the abyss going "fuck me, that is interesting"

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8Petros [$ rm -rv /capitalism/*]udostępnił to.


I swear, seeing people’s reactions to certain storylines in recent books and movies: some of y’all didn’t grow up in cults and it shows

And not in a good way

Escape isn’t easy, it isn’t linear, and the mind games stick with us long after we’ve left the physical space

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in reply to Violinknitter

Anyway, the point of this mini-rant is that a lot of your neighbors and co-workers are in various high-control (especially thought-control!) groups right now, both formal and informal

And if you don’t learn at least a little bit about what an invisible prison that is, you are going to continue to be blindsided by those neighbors acting seemingly completely contrary to all sense

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in reply to Violinknitter

AND you keep being inconsiderate or straight cruel to them, without even knowing, despite feeling good.

8Petros [$ rm -rv /capitalism/*]udostępnił to.


in reply to 8Petros [$ rm -rv /capitalism/*]

@8petros Yes, it was capable of reading a very clear font and the most basic inference from the translation.
I tootally trust tools like this to trawl through people's social media accounts in order to find students to deport for having expressed political opinions now (which USA announced they will do) for example.


Eeeej... Dajcie coś fajnego do czytania....
#UrbanFantasy #SciFi #SpaceOpera - taki eskapizm dla ekstrowertyka...
Nawet polskie może być, jak dobre.

Kierunkowy74 reshared this.

in reply to 8Petros [$ rm -rv /capitalism/*]

hmmm...

Ja polecę (jak zazwyczaj) "Krańcowo" Domańskiego, darmowe można ściągnąć za free z neta na czytnik...

Albo może hmmm "Autostopem przez Galaktykę" Adamsa?

in reply to Taki_Michal_

Zobaczę to "Krańcowo", dzięki. Autostopem się miło czytało, ale potrzebuję podbić sobie poczucie sprawczości.

8Petros [$ rm -rv /capitalism/*]udostępnił to.


What if we harnessed our collective creativity to tackle today’s challenges? Together, we can innovate for a brighter tomorrow!

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