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Bias-T on KerberosSDR?

Posted: Sun Jun 16, 2019 11:10 am
by Stromeko
Does the KerberosSDR have a Bias-T like the V3 dongle? If so, are these independently available on all antenna ports?

Re: Bias-T on KerberosSDR?

Posted: Tue Jun 18, 2019 12:29 am
by rtlsdrblog
There is no bias tee on the current version of KerberosSDR. We tried to include it on the design, but unfortunately it coupled in a lot of board noise, so the circuit would need to be redesigned to prevent this problem.

Re: Bias-T on KerberosSDR?

Posted: Wed Jun 19, 2019 8:09 pm
by Stromeko
OK, so are the antenna inputs decoupled or do I need to protect them from DC on the coax?

Just asking, I guess I'll go for an LNA (or rather four of them) that has an external bias input and feed the power to the LNA via a separate line.

Re: Bias-T on KerberosSDR?

Posted: Fri Jun 21, 2019 5:20 am
by rtlsdrblog
There is an ESD diode on the input, so best to decouple voltage from the input, otherwise the ESD diode could activate.