We received the Rev 0 RF Path blank circuit board this week and started putting it together. About 1/2 way through, I saw many areas I wanted to improve. I want all the RF connections to all be plug-n-play using fabricated SMA cables. I also decided to revise the Power Sensing circuits with larger footprints and components.
The picture below is a hybrid prototype between the original Rev 0 and the proposed Rev 1 Module.
See Rev 1 Module Artwork and Schematic link: File Attachment: HFSPPROV3 RF PATH R1.pdf (168 KB)
Another common problem is installing diodes backward and otherwise having shorts that kill boards. I have added a 34 cent PTC Resettable Fuses that will save the board if a problem is detected.
I am incorporating these changes to improve performance and your ease of construction.
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The MPU module is due to arrive this next week. I am anxious to write some driver code for the peripherals.
73, K5OOR – Virgil