Peak-to-peak voltage for mic input?

[dave.harper]

I've made a digital modem and am trying to figure out how much I need
to reduce the modem's audio output before piping the signal into an IC-
V8. I want to make sure the voltage is high enough to RX well, but
not so high that the signal is clipped of the IC-V8 is damaged.
Anyone know what the typical peak-to-peak voltage is for a standard
mic input?

Thanks in advance for any advice!
Dave

[Highland Ham[_2_]]

dave.harper wrote:
> I've made a digital modem and am trying to figure out how much I need
> to reduce the modem's audio output before piping the signal into an IC-
> V8. I want to make sure the voltage is high enough to RX well, but
> not so high that the signal is clipped of the IC-V8 is damaged.
> Anyone know what the typical peak-to-peak voltage is for a standard
> mic input?
>
> Thanks in advance for any advice!
========================
Assuming that the modem has an adjustable output , I would suggest you
hook it up to the radio and ,starting at zero input ,see at what mike
input level you get an output by listening to a receiver.
If the radio has its own mike being an electret type (possibly with an
additional built-in pre-amplifier) the mike input signal will highly
likely be in the 50 - 300 mV range .


Frank GM0CSZ / KN6WH