[ARC5] Lopsided modulation

Bob kb8tq kb8tq at n1k.org
Mon Feb 26 21:12:42 EST 2018


Hi

Ok, since you asked:

Carrier at 4 MHz
Modulation tone at 400 Hz
Deviation 20 ppm (not unreasonable for a VFO being pulled by a load)
First sideband at -12 dbc
Second sideband at =30 dbc 

So how far down is the AM sideband? …. that depends

The FM sideband subtracts from one AM sideband and adds to the other one. 
If The AM is at -12 dbc, you get a null on one side and 2X amplitude on the other side 

Yes, phase also matters …

Bob 

> On Feb 26, 2018, at 8:57 PM, Mike Feher <n4fs at eozinc.com> wrote:
> 
> Rather than commenting, I suggest some of you review the mathematics behind modulation theory. To me, so far, none of the expiations offered make any sense. 73 – Mike 
>  
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell NJ 07731
> 848-245-9115
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