Hi Lou;
That was a great sync explanation.

I have been trying to understand how that worked for years.

Thank you again.

73 De Anthony W2AJV
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ECHOLINK NODE NUMBER: 74389

----- Original Message -----
From: "Louis Kim Kline" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, January 08, 2005 5:37 PM
Subject: RE R75 Menus


> Hi Anthony.
>
> The way that I use it on the two radios that I have is to tune in the
> frequency so that the signal is centered on the AM mode, and then switch
> to
> the synchronous detector.  I find that tuning in AM with the narrowest
> filter available is usually helpful so that you can judge where the center
> of the signal is more exactly.  Sync detectors work best if you are tuned
> very closely to the carrier frequency.  What sync detectors are useful for
> is listening to signals that are getting selective fading as often happens
> during the nightime at the upper end of the medium wave broadcast
> band.  Often when such fading is occurring, one sideband and the carrier
> may fade while the other sideband fades to a lesser degree or not at all,
> causing the signal to sound momentarily distorted.  Synch detectors are
> really good at filling the missing carrier back in.  They also are helpful
> in raising signals that are near the noise floor up a bit for better
> intelligibility--at least that is what happens on my Drake and on the Sony
> 2010.
>
> These detectors have their limitations also.  If you have a radio that
> tends to drift, than you will find the synchronous detector to be
> worthless
> because if you drift a few hundred hertz off frequency, your synchronous
> detector will go out of lock, and you will hear a heterodyne on the signal
> that you are attempting to listen to.  Also, if your radio has passband
> tuning, as my Drake does, it is important to have the passband tuning
> centered up as off-tuning the passband tuning will also pull the
> synchronous detector out of lock.
>
> As for the '7600, I can't tell you--I never owned one.  The only radios I
> can vouch for are the Drake R8A (and I assume the R8B is just as good),
> the
> Sony ICF-2010, and the Lowe Research HF150.  The Drake and the Lowe
> Research radios are first rate radios, while the Sony is still quite good,
> but not quite in the same league with the "big boys."  My only regret with
> all of these radios is that there is no voice frequency readout--hence, my
> interest in the Icom R75.
>
> 73, de Lou K2LKK
>
>  At 07:45 AM 1/7/2005 -0500, you wrote:
>>Hi Lou;
>>
>>Pardon my ignorance but, how do you use synchronous detection.
>>
>>I have never been able to master it.
>>
>>And, do you know how good the synchronous detection is in the Sony 7600?
>>
>>73 De Anthony W2AJV
>>[log in to unmask]
>
>
> Louis Kim Kline
> A.R.S. K2LKK
> Home e-mail:  [log in to unmask]
> Work e-mail:  [log in to unmask]
> Work Telephone:  (585) 697-5753
>
>
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