On Mon, Aug 28, 2023 at 11:44 PM, <kai@...> wrote:
Since the Q900 has problem with modulation especially on FM, I looked for an amplified mic. The procomm mic that works well with, is not sold in Germany or many other countries. The mics I found where expensive.?
I decided build my own amplified microphone with parts I found online. I don't mind improvising and I have fun building stuff.
Here is what I came up with so far. I tested the mic amp module successfully NFM 2m and got a good feedback after a quick QSO. But everything still has to be put into a housing.
The mic amp module has a DC offset. I decided to use a decoupling capacitor. But what value should I take? I don't have experience with mic amps and inputs. Also the potentiometer is needed to lower the output signal. Is 10k ok? It works with the Q900 but what are usual values?
I have a friend who noted the Q900’s poor mic quality. ?He opened up the mic and found there was no hole for sound to travel. ?He drilled a small hole in the shell in front of the microphone diaphragm. ?It sounds great now.
73,
N3CNO
Nick (N3CNO)