![]() Everything is powered by a 12-volt battery which can be charged from a small solar panel. The Pi and SDR might also be part of a NOAA satellite receiver like the one describes in a separate video such a setup would be very valuable in natural disaster responses. The video tour below is all we have to go on, but we can see a tri-band transceiver, an RTL-SDR dongle and a Raspberry Pi with a TFT screen for tracking satellites. The go-box that came up with is absolutely packed with goodies that would make it a perfect EmComm platform. Go-boxes, as they are known, have been a staple of amateur radio field operations for as long as there have been hams. ![]() And the perfect thing for the ham on the go is this ham shack in a box. Michael Gardi has updated the project titled TMD-3: Turing Machine Demonstrator Mark 3.“When all else fails, there’s ham radio.” With Hurricane Harvey just wrapping up, and Irma queued up to clobber Florida this weekend, hams are gearing up to pitch in with disaster communications for areas that won’t have any communications infrastructure left.Guido has updated components for the project titled 32MHz spectrum + SDR + FT8 in an FPGA.Karl has updated the project titled ANNA POP.Glen Milton has updated the project titled The Test Printer For heat Transfer.Barkfin liked MCL65+ Drop-in 6502 Emulator and Accelerator.Guido has updated the log for 32MHz spectrum + SDR + FT8 in an FPGA.Noman has updated the project titled AIA-Teddy: Breathing Life into AI Companionship.Noman has updated components for the project titled AIA-Teddy: Breathing Life into AI Companionship.The Commenter Formerly Known As Ren on To Give Is Better Than To Receive.NBP on Make Better 3D Printed Molds, For Thermoforming Plastics.willmore on Hackaday Prize 2023: 10 KW Electronic Load.CaptainAhab on An Electric Unicycle, In Minimalist Form.Ostracus on Labor Day BBQs May Feature NYPD.Ostracus on To Give Is Better Than To Receive.Somehuman on Labor Day BBQs May Feature NYPD.Observer on Make Better 3D Printed Molds, For Thermoforming Plastics.CityZen on On Vim, Modal Interfaces And The Way We Interact With Computers.Somehuman on Hefty 3D Printed Quadcopter Meets Nasty End.Retro Gadgets: The 1974 Breadboard Project 31 Comments Posted in Radio Hacks Tagged amateur radio, amplifier, ham, LDMOS, push-pull, RF, transmission line transformer Post navigation The video below gives a tour of the amp and shows some tests with impressive results. Even the heatsink compound is special rather than the typical silicone grease, he chose a liquid metal alloy called Gallinstan. paid a lot of attention to thermal engineering, too, with the LDMOS transistors living in cutouts in the custom PCB so they can mate with a hefty heatsink. A pair of the LDMOS devices form the heart of the push-pull amp, as do an array of custom-wound toroids and transformers including a transmission line transformer wound with 17-ohm coax cable. While LDMOS transistors aren’t exactly new – laterally-diffused MOSFETs have been appearing in RF power applications for decades – the particular parts used for the amp, NXP’s MRF300 power transistors, are pretty new to the market. One of the great joys of being a ham is being able to build your own gear, and to incorporate the latest technology long before the Big Three manufacturers start using it. We’re really impressed with the work that put into this power amp. That’s where builds such as this well-engineered 600W broadband RF amplifier come into play. But sometimes quantity has a quality all its own, and getting more power into the ether is what the contact requires. That’s just part of being a good spectrum citizen, and well-earned bragging rights go to those who make transcontinental contacts on the power coming from a coin cell. ![]() Typically, amateur radio operators use the minimum power needed to accomplish a contact.
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