Eltek SMPS 1800SI Connection Mod

The Eltek SMPS 1800 SI 48v switch mode power supply is capable of supplying 37.5A (1800w) so is great for powering 48v amplifiers. The only issue, which is common to most rack mounted SMPSs is they have proprietary connectors on the rear meaning a datasheet or manual is required to know which pin does which.

Icom External Keypad

In the past I’ve designed and built external keypads for triggering the REMOTE input on an Icom mic connector [1] & [2].  These both were designed to add an auto repeat feature to the in-built Icom voice keyer for older radios by monitoring the radio’s PTT state (the duration of the voice recording) then adding