[Yaesu] Proper way of tuning up a analog rig

[Floyd Sense]

Regarding zero beat:  The explanation given is not correct.  The purpose of
"zero beating" is to get the transmitter on the same frequency as the signal
you're listening to.  The technique described will result in the two signals
being offset by an amount equal to the BFO beat note you like to listen to.

The "beat" is the audible difference heard as a result of mixing of two
signals in the receiver.  When you're listening to a CW signal, what you're
hearing is the beat between the BFO signal and the CW signal.  Varying the
frequency of either of the two signals changes the beat note heard.  When
two signals are on exactly the same frequency, they are "zero beat".  If two
signals differ by, say 20 Hz, you'll hear a 20 Hz "beat" note.  So, to get
your VFO on the same frequency as the CW station you're listening to, you
need to tune your VFO so that the signal  you hear from it is the same
frequency as that of the CW signal.  If you listen to an 800 Hz beat note,
you want to adjust the VFO to produce the same 800 Hz note.  As you approach
the same frequency, you'll hear a beat note produced by the mixing of the
two audible signals.  If the CW signal is at 800 Hz and your VFO is being
heard at 810 Hz, you'll actually observe a 10 Hz beat note in the speaker.
As you get closer in frequency, this beat note will reduce in frequency
until you get it right on, where you'll be at "zero beat".

I've seen several manuals from Yaesu, Icom and Kenwood that describe the
procedure for zero beating incorrectly.

K8AC

----- Original Message ----- 
From: "Darrell Drake" <dgdrake@rogers.com>
To: "Hart Engel" <va3kis@hotmail.com>; <yaesu@mailman.qth.net>
Sent: Tuesday, July 29, 2003 11:07 PM
Subject: Re: [Yaesu] Proper way of tuning up a analog rig


>     Follow the tune up procedure exactly as written in the manual. With
> familiarity and practice, you'll be able to do it quite quickly. The only
> other way for a faster tune up is a  NO tune up radio...get a solid state
> rig and you just have to push the power button.
>     Zero beating a signal (carrier or CW) should have been covered in your
> Basic Qualification class/manual.
>     When you hear a carrier or CW signal, you tune the VFO to lower the
> pitch until you no longer hear it, just "dead air" or in the case of CW, a
> puffing sound. Now you have zero beat the incoming signal. You will find
> that the signal you CAN hear will be deviated by about 800 Hz from "zero
> beat".
>     Zero beating has nothing to do with tuning the final amplifier.
>     Analog display also has nothing to do with tuning procedure.
>
> > I have as you already know a ft-301 rig with a analog display. I have
read
> > the manual on the tuning up proceedure, but was wondering if there is a
> > faster way or a more effecient way i should be doing it.
> >
> > What do they mean by zero beating?
> > please explain in simple terms for me.
> >
> > Hart
> >
> >
>
>
> Moderator: Ray Brown, KB�STN
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