I spent last night delayering a Datatrak receiver PCB. This is how far I got. Still lots of FR4 to remove, and my shoulders hurt like heck this morning.

Does anyone know of any good application notes on RF power amplifier design with BJTs or FETs? Modest requirements, 1.5W max ideally from 3.3V supply but I can stretch to 5V. UHF 70cm band. Lower power is fine too, 250mW+ say.

Sometimes I wonder if "fox" is my only personality trait. Then I remember that fox describes a whole slew of personality traits, and many of them are mischievous. Also snacks.

It's a bit troublesome to see so many people saying that HTTP/3 works around enough problems that we don't need to go to #ipv6.

Remember all the innovations that got us here? So many of those happened because someone was able to stand up a prototype on their home/office machine with a public IP. If everybody's behind a NAT, you won't be able to do that. You'll have to pay whoever has the public IPs (cloud!) to do it, and they'll likely charge a premium the more scarce they become.

Some more book-related #alternatives:

inventaire.io - Community for swapping books powered by libre software & WikiData, follow them on here at @inventaire

libreture.com - eBook storage site with social features, follow them on here at @kevinbeynon

openlibrary.org - Huge non-profit online library with downloads for PD books and lending for non-PD titles.

calibre-ebook.com/ - Open source eBook organiser/editor and format converter

#Books #eBooks #Literature

hello and welcome to "is it a good idea to microwave this"

i'm your host, jory caron

and i'm your sidekick, riley mcllwain

today we'll be microwaving this microwave

Got a RasPi running Pi-Star. Just flashed in the latest STM32 firmware and it's running a DAPNET POCSAG hotspot. Got a PoE inserter arriving tomorrow, then it'll be going on the shelf with an Ethernet cable in tow.

My hand crafted portable radio stand, made out of wooden floor scraps, for my Tecsun PL-880 #sw #swling #radio #hamradio #craft

Tonight's project, a Raspberry Pi 3 Model B+ with HAT running from a 13.8V radio power supply.

Does anyone know of a way to load ADS models into RFSim99?
Failing that is there a similar filter/matching design tool which can load ADS models?
I want to use an NXP RF transistor in a UHF PA, but they only provide ADS models, not Touchstone/s2p files.
Sadly ADS is a bit out of my price range!

Just spent twenty minutes trying to figure out why the server wouldn't boot after I moved the main boot drive onto an SSD.
Turns out I had the boot device order wrong in the BIOS. Oops.

Abuse, callouts, amends, personal philosophy Show more

Abuse, callouts, amends, personal philosophy Show more

All done! And working to spec, if not better -- about -120dBm for 12dB SINAD.👍

@m0ofx Finished the chassis work. Both radios look pretty much stock now. Last job is to tune up the repaired one (note the jig cable). Other than that, all done!

@m0ofx Shield is on, jig cable is plugged in, and we've got 4.3W power output. Considering the PA isn't aligned yet, I'll take that as a nice starting point!

@m0ofx Shield is on, jig cable is plugged in, and we've got 4.3W power output. Considering the PA isn't aligned yet, I'll take that as a nice starting point!

@m0ofx The new PA is in. Next the shield needs to go back on, then it's time to power up and check there's amplification happening.

@m0ofx Well that's the PA module off. The dried out thermal compound might be a bit of a clue.

Show more
Mastodon

Follow friends and discover new ones. Publish anything you want: links, pictures, text, video. This server is run by the main developers of the Mastodon project. Everyone is welcome as long as you follow our code of conduct!