[AMRadio] Ranger Modulation

Jack Schmidling jack at schmidling.com
Wed Nov 15 23:02:02 EST 2006

I suspect my mic problem is with the cartridge and I will be getting a 
new one.

The now problem seems to be that I just can not seem to get 100% 
modulation no matter what mic I use.

When I adjust the scope so the carrier is +/- 1 div, I can never get it 
quite to +/- 2 and 1.5 is pretty typical.

On the other hand, I have no trouble getting a flat line between cycles 
with too much audio which I understand is the indication for over 

I am using a audio generator at 1 kHz talking to an earphone, against 
the mic.  The modulation meter can easily be pinned if I use an 
amplified mic but it has no effect on the top of the envelop.

What does all this mean?


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