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Lizakowski

@lizakowski@sfba.social
mastodon 4.7.3
  • Open on sfba.social

Sciencey-geek of many types.

It's ok for people to reply to me even if they don't know me. I'm here for conversation.

I tend to post more than boost/retweet.

@jlizakowski at the birdplace

Palo Alto, CA.

160 Followers
587 Following
2 Posts
Joined November 06, 2022
Matrix chat:
Matrix:@lizakowski
Open post
Lizakowski @lizakowski@sfba.social
· 1mo ago
I ordered a bunch of antenna books from #ARRL and was hoping for more information and advice above 1ghz. I'm looking at RF cables for making #meshtastic #antennas, but I also want to use them with my decade-old #SDR that goes up to 6Ghz. And I have interest in higher frequencies. To set expectations, I remember 900mhz radios were sold by radio shack when it existed. 2.4 ghz was commonplace 20 years ago. Cellphones and wrist watches now use 5ghz wifi, and cruise control for cars uses 77ghz. But the highest freq in the books are the UHF to Microwave chapter. It spends a lot of time on UHF and VHF, and the diagrams mostly go from 1-100Mhz. A few tables show losses at 1 ghz, and a single graph shows 10ghz. I'd love to see separate chapters (or books) dedicated to microwave and mmwave, maybe with some hints about thz. Especially if it has the practical wisdom the HF bands get. E.g. What's the best way to connect to a 5ghz yagi? I'm not the person to write them, unfortunately, but I'd love to read them.
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Open post
Lizakowski @lizakowski@sfba.social
· 1mo ago
Replying to
@HopelessDemigod@mstdn.social I was definitely thinking of a smaller antenna :) The #meshtastic #yagi is the size of a dinner plate, and connects to a few small boards. Right now it's all on a desk pointing out a window. For a better view, the antenna needs to be outside on the patio. Maybe 3 meters of coax to connect my desk to the antenna. #LMR600 would work, but it is also 0.6 inches diameter. The radio would almost fit inside the cable. I should probably describe this as patch cable, given the short distances needed.
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