[Premium-Rx] Comparing AM Synch Detection to AM Product Detection

[Tom M.]

Depending on the rig, the sync detector may offer a bit more advantage as the
lock range may as high as +/- 2 KHz or so.  In product detection you're pinned
to the frequency of interest.  Adjacent channels that are a problem can be
partially avoided by the sync detect lock range (i.e. if you're desired freq is
870 Khz and you have adjacent channel on 860 Khz, sync detector may allow you
to tune 872 Khz and still remain locked on.  

Also, if the frequency generation device drifts at all, product detection will
noticeably change freq while the sync detect will stay locked on and you won't
notice it in the pitch of the sound.

All this said, product detection still works perfectly fine.  Gives one the
opportunity to fiddle with the dials.  

The sync detect adds a bit of gee whiz factor.  I have rigs with both and like
both.

73 Tom N5OFF
--- Ahmet Gundes <ahmet-m at usa.com> wrote:
> 
> Hello everybody.
> 
> I am wondering how Synchronized AM Detection would compare to regular Product
> Detection
> of AM signals (detecting it as SSB signal).  The only difference in the Synch
> detection is
> basically RF and LO at the Product Detector are in Phase.  Does this offer
> any
> added benefit such as improved Audio quality, better fighting Fading,... etc
> ?
> 
> The reason of this question is that I am comparing the two methods and I am
> not sure
> if there really is any difference as far as my ears can distinguish. The Sync
> detection being 
> a more complicated circuitry and requires better design, is it worth the
> effort ?
> 
> I am not too sure but I think the mathematical formula for both methods comes
> down to same 
> after the multliplication.
> 
> Regards to all.
> Ahmet 
> 
> 
> 
> 
> 
> -- 
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