Settings : Pay attention with the gain of this microphone.
I recommend you adjust your TX for a correct audio level,
with one or more unamplified mics.
Adjust R15 for the output level; adjust R7 and R11 according to your voice.
Turn your adjustable with a plastic screwdriver because with a metal screwdriver
there would be a hand effect.
Setting time: 15 minutes with another reliable station (selection to be done Hi!)
Component side :
I recommend you adjust your TX for a correct audio level,
with one or more unamplified mics.
Adjust R15 for the output level; adjust R7 and R11 according to your voice.
Turn your adjustable with a plastic screwdriver because with a metal screwdriver
there would be a hand effect.
Setting time: 15 minutes with another reliable station (selection to be done Hi!)
Component side :
Schematic diagram :
RFC1 = RF miniature choke, 220 mH at 1 mH Do not replace with a ferrite core
it is possible to further improve the performance of the microphone by:
changing the value of R6 , 9 , 10 by 1K
and replacing Q1 ( 2N3904 ) by a 2N2222A (**)
** ATTENTION to the pin assignment of 2N2222A when installing the component
RFC1 = RF miniature choke, 220 mH at 1 mH Do not replace with a ferrite core
it is possible to further improve the performance of the microphone by:
changing the value of R6 , 9 , 10 by 1K
and replacing Q1 ( 2N3904 ) by a 2N2222A (**)
** ATTENTION to the pin assignment of 2N2222A when installing the component
