Re: separate CAT jack, without using the USB cable #ubitx #arduino #cat #raduino

John (vk2eta)

Hello Sascha,

It should work "in theory" without a level converter (but it does not hurt to verify).

Reason being is that "A TTL input signal is defined as "low" when between 0 V and 0.8 V with respect to the ground terminal, and "high" when between 2 V and VCC (5 V)". Source PJRC forum.

So even if the output is 3.3V it should be sufficient for the Tx side (resistors excepted as you mentioned).

73, John 

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