The latest version of the transmitter board has just finished production and will be arriving soon.
The new version has several improvements over the last. It is now using the NCP drivers and using one of those per MOSFET. The layout is a bit different as well. In order to reduce trace length as much as possible, the MOSFETs are now mounted below the board at a right angle. The new heatsink will be a square tube AKA cooling aggregate. I have not completely decided on this part yet, but fischerelektronik https://www.fischerelektronik.de/web_fischer/en_GB/heatsinks/D/Cooling%20aggregates/index.xhtml
. . .has some very nice heatsinks for this purpose. This will go right under the center of the board and the MOSFETs will mount upside down onto it.
I will also be using a PWM to modulate from now on. RF2017 (eBay) from Greece has now supplied me with an updated PWM module that is capable to modulate 500W carrier.
I have collected some more datasheets and created an excel spreadsheet for the parts list (which used to be in a text file and was limited). Sorry, the new PCB file has been removed from the archive. If you would like the PCB, please contact me or Tech Ingredients to order. You can still find the old PCB file and Gerber files in the archive if you want to send to fab yourself. You may modify the file using Sprint Layout.
You can download the updated archive here: https://drive.google.com/open?id=1C16XIHy0UGuOIszfQyuvUErVxDF4z_b3
You may notice that there are some datasheets in the archive containing shortwave receiver ICs. I am also building a receiver around the KT0915, but that project is on the back burner. The chip is interesting though because it can receive all the way from 150KHz to 110MHz with FM or AM demodulation and no gaps. Making this project into a transceiver may be possible if there is some type of RF relay, but I know very little on the subject and will have to do more research. Either way, the chip has the best sensitivity out of all the SW receiver all-in-one chips I could find. I want to keep this simple, so I do not plan on constructing a receiver from scratch. The chip is very easy to use. You just need a microcontroller (like an Arduino or PIC) and the chip itself. The chip will output a line level signal with no external components. A PCB is in order and will be experimented with when my main project is complete.
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