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Comment Recommended book. (Score 1) 270

I want to give making my own valves a go, but first I've got to overhaul my vacuum pump, because it doesn't suck. (Well, I need at least 35torr, and it has trouble getting to 120torr.)
I've got this book and like it: Instruments of Amplification.
It's not so much a howto guide as a recounting of "I did this, and this is how it worked". Useful tips on how to cut open bulbs and harvest filaments, how to drill glass, basics of vacuum working and lots else.

Comment SDR transmitting (Score 2) 42

For transmitting there's the HackRF which is a few mW output and is the one I've played with. Also another supplier that has cheaper, transmit only versions; the HackRF Blue
For quite a bit more, there's MIMO capable devices such as the Ettus USRP that lets you run your own GSM basestation among other things.
And for a more stand alone device, there's always the PortableSDR
I've got a HackRF and am having fun with it trying to make a network analyzer. The others, I've just heard about.

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