13432Re: [tracker2] OT2 Audio Out Questions (Decoupling and Deviation)
- Jan 6, 2012On Fri, Jan 6, 2012 at 12:01 PM, Edward <egiandomenico@...> wrote:
> Question 1: The OT2 has a 0.1uF decoupling capacitor on the "Audio Out" line. Is that correct?Yup.
> Question 2: In addition to the decoupling capacitor there is a jumper "HI" that allowsNope... the HT jumper changes the loading on the line... Some HTs look
> you to select use of either a A.) 100k resistor or B.) 100k resistor in parallel with a 30k
> (~23K). If I understand the circuit correctly the resistor(s) are used to control the voltage
> of the signal being sent to the transmitter (which in turns will control the deviation
> of the output signal). Is that correct?
for a load on the audio line when PTT is asserted, some HTs need a bit
more load than others... The audio (and it's deviation) are an AC
signal superimposed on the DC on the circuit. The AC passes through
the decoupling capacitor while the DC is being blocked. Deviation of
the audio signal is controlled elsewhere, which in the OT2 is in the
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