From scr287 at att.net  Thu Feb 15 22:25:14 2018
From: scr287 at att.net (Jack Antonio)
Date: Thu, 15 Feb 2018 22:25:14 -0500
Subject: [Motorola] Systems 90?
Message-ID: <5714f1d7-ec30-58b8-43f0-734f1c8a4c9f@att.net>

Hello All,

I may be a glutton for punishment, but I'm working on

bringing my old 8ch 2M Micor back to life, with its

Systems 90 multi-pl encoder.

 ?I need the tan connector for the multi pl module.

Anyone have one in their stash somewhere?

I have pins and the removal tool, and I probably could

jury rig something, but would like to do it the right way.


Also, I'm going to make my yearly request for

the manual on the Systems 90 8 channel

channel scan module.? They all seem to have

gone into deep hiding.


Thanks in advance


Jack Antonio

WA7DIA


From scr287 at att.net  Sat Feb 17 14:34:23 2018
From: scr287 at att.net (Jack Antonio)
Date: Sat, 17 Feb 2018 14:34:23 -0500
Subject: [Motorola] Why 52.525
Message-ID: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>

The answer to this may be lost to history, but I got to wondering...

What was the driving force behind making the 6M FM simplex
frequency 52.525?? Why that, and not some other frequency?

Just curious.

Jack Antonio
WA7DIA




From djoneses at verizon.net  Sat Feb 17 15:16:16 2018
From: djoneses at verizon.net (D Jones)
Date: Sat, 17 Feb 2018 15:16:16 -0500
Subject: [Motorola] Why 52.525
In-Reply-To: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
References: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
Message-ID: <161a568f861-c8d-3cc31@webjas-vad058.srv.aolmail.net>

Found this on a Yahoo group.  Take it for WHT it is worth.

Now from a real old timer. I go back to the 1950's on six meters when we 
were using old F.M. Link* radios with all square wiring and 807's in the 
finals. In those days FM was only authorized above 52.500 MHz. We used unheated 
crystals and wide open IF with 15 kHz (sorry,it was kc/s back then) deviation. 
Someone with a reasonable sense of understanding decided we needed to be 25 
KHz inside the FM band just to be safe in those days with not the greatest 
frequency measuring devices. So 52.525 came into being.



On Saturday, February 17, 2018 Jack Antonio <scr287 at att.net> wrote:
The answer to this may be lost to history, but I got to wondering... What was the driving force behind making the 6M FM simplex frequency 52.525?? Why that, and not some other frequency? Just curious. Jack Antonio WA7DIA ______________________________________________________________ Motorola mailing list Home: http://mailman.qth.net/mailman/listinfo/motorola Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Motorola at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html

From w0rw1 at msn.com  Sat Feb 17 15:32:23 2018
From: w0rw1 at msn.com (Paul Signorelli)
Date: Sat, 17 Feb 2018 20:32:23 +0000
Subject: [Motorola] Why 52.525
In-Reply-To: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
References: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
Message-ID: <DM5PR0102MB3381DCF9CBB8ECE565B3C113B6CA0@DM5PR0102MB3381.prod.exchangelabs.com>

After the War the old 5 meter band (56 - 60) was changed to 50 - 54 mcs.

The FM assignment was 52.5 and up.

FM deviation was 15 kcs.

52.500 + .015 = 52.515, add a 10 kcs guard band and you get a round number   52.525.

It wasn't very crowded back then.

Paul  w0rw

From scr287 at att.net  Sat Feb 17 16:47:04 2018
From: scr287 at att.net (Jack Antonio)
Date: Sat, 17 Feb 2018 16:47:04 -0500
Subject: [Motorola] Why 52.525
In-Reply-To: <DM5PR0102MB3381DCF9CBB8ECE565B3C113B6CA0@DM5PR0102MB3381.prod.exchangelabs.com>
References: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
	<DM5PR0102MB3381DCF9CBB8ECE565B3C113B6CA0@DM5PR0102MB3381.prod.exchangelabs.com>
Message-ID: <2da87f28-93d0-4cee-9d68-d9edd25a7070@att.net>

On 2/17/2018 3:32 PM, Paul Signorelli wrote:
>
> The FM assignment was 52.5 and up.
>
And that is the one piece of information that I either never
knew, or forgotten if I had known it.

That makes sense why it is what it is.

Thanks for the replies

Jack Antonio
WA7DIA

From w6cdw at sbcglobal.net  Sat Feb 17 16:53:10 2018
From: w6cdw at sbcglobal.net (CLIFF WALLACE)
Date: Sat, 17 Feb 2018 21:53:10 +0000 (UTC)
Subject: [Motorola] Why 52.525
In-Reply-To: <DM5PR0102MB3381DCF9CBB8ECE565B3C113B6CA0@DM5PR0102MB3381.prod.exchangelabs.com>
References: <ecc05bbb-85bd-b502-c998-7473df74ffbc@att.net>
	<DM5PR0102MB3381DCF9CBB8ECE565B3C113B6CA0@DM5PR0102MB3381.prod.exchangelabs.com>
Message-ID: <1611986733.383538.1518904390551@mail.yahoo.com>

May frequency be measured in cycles.......Hertz only rents cars, and even that is debatable.

Sent from Yahoo Mail on Android 
 
  On Sat, Feb 17, 2018 at 14:32, Paul Signorelli<w0rw1 at msn.com> wrote:   After the War the old 5 meter band (56 - 60) was changed to 50 - 54 mcs.

The FM assignment was 52.5 and up.

FM deviation was 15 kcs.

52.500 + .015 = 52.515, add a 10 kcs guard band and you get a round number? 52.525.

It wasn't very crowded back then.

Paul? w0rw
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