Knowledge Base - FAQ
50 ohms. Do not terminate.
Pergunta:
In the Fury manual the CMOS and 1PPS Out the descriptions of the outputs state "50Ohms, Do Not Terminate." What is the meaning of this?
Answer:
The output is designed for a reflected-wave 50 Ohms open-ended transmission line/coax system. The reason for that is lower power consumption, and lower to no-modulation of the internal rails with 1Hz and harmonic noise. See here for a description of how that works:
https://en.wikipedia.org/wiki/Reflected-wave_switching
It assumes a 50 Ohms transmission line such as a coax cable, that does not have a 50 Ohms resistive end-termination. So, a simple RG-316 coax cable with the customer equipment having an input termination of 1K Ohms or higher is what this is designed for.