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In this episode we cover the hardware of the TA-1042, a digital non-secure voice terminal (DNVT) used by the military in the 90s-00s. We then explain how we can use modern components to create compatible switching equipment, with a bit of EE fun along the way!

To buy this crazy contraption: https://www.tindie.com/products/nicka...

Episodes in this series:
- part 1: project overview    • Reverse Engineering a Cold War Milita...  
- part 2: hardware reverse engineering (you are here)
- (upcoming) part 3: programming real time firmware with the Raspberry Pi Pico
- (upcoming) part 4: USB programming and interfacing these with SIP
- (upcoming) Bonus video: the DNVT fax machine

From the extras channel @NicksKnacksExtras
- Video user guide:    • Digital Military Telephone Switch Fea...  
- Soldering/assembly tutorial:    • DNVT Switch Assembly Instructions  

More details:

The TA-1042 is a quite slick looking military phone that uses the CVSD audio codec and a proprietary switching protocol. The project implements a hat for the Raspberry Pi Pico (RP2040) cortex M0+ microcontroller that leveraged the Programmable I/O (PIO subsystem) to encode/decode data from differential Manchester encoding provided by the phone.

The entire project is open source! For the full details see the product page: https://nicksknacks.net/dnvt-switch/

If you want to support our channel and get some fun perks, we are now offering memberships:
   / @nicksknackstech  

And no, there's nothing surprising about the circuits. Sorry XD