Phil,
Synchronous detection is the receiver's ability to lock on to a carrier and
supply that carrier's frequency to the detector during selective fading.
When it works properly, as it does in the 2010, the result is to minimize
the distortion on an AM signal that occurs when the carrier drops out
leaving only the sidebands. As I said, it's one of the 2010's best
features.
Steve
----- Original Message -----
From: "Phil Scovell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, November 16, 2008 23:10
Subject: Re: Filtering report of the IC7000
> Steve,
>
> I'm not even certain what synchronous detection is so explain. There is a
> lot of synchronous topics in the manual and if synchronous detection is
> what
> I think it is, I haven't discovered that to be in the 7000 radio.
>
> Phil.
> K0NX
>
>
>
>
> ----- Original Message -----
> From: "Steve Dresser" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, November 16, 2008 8:09 PM
> Subject: Re: Filtering report of the IC7000
>
>
>> Phil,
>>
>> Does the 7000 have synchronous detection? That may not be high on your
> list
>> of must-have features, but it's one of the best features of the 2010, and
>> almost impossible to find elsewhere.
>>
>> Steve
>>
>> ----- Original Message -----
>> From: "Phil Scovell" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Sunday, November 16, 2008 14:16
>> Subject: Filtering report of the IC7000
>>
>>
>> >I have tuned in some strong CW signals compared to the weaker ones I
>> > reported on the other day. The S9 signals tune down to about 80 Hz
>> > compared
>> > to the narrow 12 to 14 Hz of the weaker signals. I am saying that
>> > anything
>> > outside these thresholds, top and bottom, means the signals simply
>> > isn't
>> > there; they are gone, that is, cut off. Pretty narrow tuning. I am
> also
>> > copying weaker signals, that when tuning passed them with wider
> filtering,
>> > such as in the sideband mode and are hardly copyable, once the CW
> filters
>> > mode is buttoned on, the signals come up to a Q5 copy level and then
>> > can
>> > be
>> > made even stronger by fiddling with the tuneable filtering. I've also
>> > tested the notch filter used for zeroing out a carrier that comes on.
> It
>> > vanishes when you hit the right frequency but very little change is
>> > noticed
>> > in the background noise characteristics of the receiver. I also got a
> lot
>> > of time during Sweep Stakes to play around with the sideband filtering
> and
>> > witnessed first hand how narrow you can tighten down on a sideband
> signal
>> > and still copy him just fine.
>> >
>> > I still haven't learned how to set memories or scan, you get mighty
> tired
>> > at
>> > spinning the dial at 1 or 10 Hz, so I plugged in the desk microphone I
>> > purchased because I knew it would have up and down scanning buttons,
> which
>> > it does. Those work fine other than the fact you have to hold them
>> > down
>> > during the scan and it would appear, from my frequency readings, that
> you
>> > are jumping 5 Hz in the sideband mode on the default setting so it
>> > works
>> > pretty well. It is pretty quick but not too fast that you just whiz
>> > passed
>> > the signal before you know it.
>> >
>> > Dumb me. I discovered this week, too, just playing around, it covers
> the
>> > FM
>> > broadcast band but for good fidelity, I'm going to find me a bigger,
>> > basier,
>> > speaker because those in the radio are pretty tinny sounding. In
>> > short,
>> > it
>> > would appear the 7000 will replace all my radios by a wide margine and
>> > this
>> > includes my beloved Sony 2010 I have had for years. The 7000 is about
> the
>> > size of a cigar box but you can pound nails with it due to its metal
>> > construction.
>> >
>> > Phil.
>> > K0NX
>> >
>>
>>
>> --
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> 10:04 AM
>>
>>
>
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