[TenTec] CW Tuning with Omni 6 Plus

[Duane Calvin]

Exactly - zero beat is when the "beat note" between the two tones goes to
zero Hertz.  Hence, zero beat.  Musicians know all about this when they tune
their instruments.  

  73,  Duane

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  
 
-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Ken Brown
Sent: Friday, June 01, 2007 6:20 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] CW Tuning with Omni 6 Plus

When two tones (RF or audio) are at exactly the same frequency, they are 
"zero beat" with each other. They could be at any phase relation to each 
other, so the amplitude of the sum of the two could be anywhere from 
twice that of one of them or zero. Without careful amplitude adjustment, 
the two tones will not be equal, so twice the amplitude, or zero, will 
seldom occur. Even with careful amplitude adjustment the phase relation 
will seldom be exactly zero or 180 degrees, so double amplitude or zero 
amplitude sums will still be rare.

Having said all of that, the sum is just as likely to be lower amplitude 
as it is to be higher than that of either single tone.

James Duffer wrote:
> snip
>   
>>     When the "cw" button is pushed you get a sidetone. While holding down

>> this button you move your dial until your target's tone is "beating" 
>> against your sidetone. When you move the dial enough so that your
sidetone 
>> no longer "beats" and the tones are "insync" they become "one". When two 
>> tones become "one" the tone gets louder. This is "zero beat". Even having

>> just "beating" is close enough for govt work.
>>     
> snip
>
> For many years I have been under the impression that "zero beating" was
the 
> method of beating (hetrodyning) of two frequencies bringing their
difference 
> down to the audible range and adjusting one to match the frequency of the 
> other so that the two tones beat against each other producing "zero" out.

> Thus the term zero beat.  Not a louder tone.
>
> de wd4air
>
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