Starting to work on a HF amplifier following this article. First step is the power supply board with overcurrent protection for the FETs. Looks great in After Dark finish, and tests out perfectly! On to the amplifier board... g0kla.com/scpa/SimpleCheapPA…
They measure in at 46.5 ohms impedance, so I need to tweak the recipe a little, but they sure do look the part!
I had a joke about square waves, but people's bandwidth for this twitter meme ran short and it lost its edge.
After Dark finish from @oshpark turned out great. This is a add-on board for a Bemicro Max 10 FPGA dev board that visualizes the generation of the Long PN Code in a CDMA cellular system.
After Dark from @oshpark is really cool. I might redo this board without the ground fill to compare.
Nice clean way to experiment with the Tzumi MagicTV. Install a little serial port in the side for a USB-to-Serial converter and keep the board and battery inside the case.
Transmitting narrow FM with Osmo-fl2k. I populated one of my filter boards with a band pass for 2 meter. Nice clear audio. Just need to work out a push-to-talk mechanism and I'll try it on air. Any ideas for inserting CTCSS?
Working on some SMA adapters for Osmo-fl2k. The one with a bandpass filter will take a little more work, and I have a board with an L-match on order. But here is the simple SMA breakout for anyone interested: oshpark.com/shared_projects/…
Osmo-fl2k is working great. A 30 dB attenuator is just right for connecting to an RTL-SDR dongle directly. Check this out if you want to make your own attenuators: syncchannel.blogspot.com/201…
