[Ronja] 75 impedance

[Karel Kulhavy]

---- Cecilia Puon <cpuon at fsomexico.com> schrieb:
> Hello, I have read "How does ronja work?" and  says that : Collector of
> the Q103 transistor acts as a current cource working into 75 Ohm
> resistor. This way output impedance of 75 Ohm is guranteed independently
> of switching state of the output stage.
> 
> If you use TP cable to send the signal to the Twister, this induces a
> mismatch, does not it? Because TP cable has 100 ohms of impedance.

Coaxial cable is specified for sending signals from RX (where Q103 is) to the Twister. If you use something else then the function is not guaranteed.

> 
> Can you tell if I am wrong? or  what do you think about that?

I think that TP cables shouldn't be used instead of coaxials because their function is fundamentally different.

Karel
> 
> Thank you for your answer.
> 
> Cecilia Puón.
> 
>