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Re: Arabic (?) music on FO-20 !!!



William,
You're right, I got confused on the translation.  Sorry about that...
On the FM...that was a real question, and I got a few responses all the 
same.  Interesting!


At 01:39 2003-04-23, William Leijenaar wrote:
>Hi Scott,
>
>Reply to 1.
>-----------
>The FO-20 transponder frequencies are as follows:
>Uplink: 145.900 - 146.000 MHz
>Downlink: 435.795 - 435.900 MHz (inverted)
>
>It is inverted what means that 145.900MHz is equal to 435.900MHz.
>When going up 50kHz in uplink frequency to 145.950MHz you get 50kHz down 
>in downlink frequency what is 435.850MHz etc...
>This is also the centre freq. where is most activity...
>
>Reply to 2.
>-----------
>FM on a inverting transponder sounds like normal FM.
>The transponder inverts the FM spectrum but when you know how a FM 
>spectrum looks like, you find out that the inverted FM signal is equal to 
>the none-inverting FM signal.
>
>I need a picture to explain it more in detail, but unfortunatly 
>email/amsat-bb has no graphic possibility :-(
>
>Maybe someone else can explain it better in words...
>
>73 de PE1RAH, William
>---
>
>>From: Scott Townley <nx7u@cox.net>
>>Reply-To: nx7u@arrl.net
>>To: "William Leijenaar" <pe1rah@hotmail.com>,amsat-bb@AMSAT.Org
>>Subject: Re: [amsat-bb] Arabic (?) music on FO-20 !!!
>>Date: Tue, 22 Apr 2003 14:48:04 -0400
>>
>>1. If the downlink was 435.900, the uplink would be 145.800, +/- Doppler
>>2. How does FM sound through an inverting transponder?
>>
>> >
>> > From: "William Leijenaar" <pe1rah@hotmail.com>
>> > Date: 2003/04/22 Tue AM 11:39:06 EDT
>> > To: amsat-bb@AMSAT.Org
>> > Subject: [amsat-bb] Arabic (?) music on FO-20 !!!
>> >
>> > Hi AMSATs,
>> >
>> > Anybody else hearing some (sounds to me) Arabic music, in FM on FO20 ???
>> > I heared it yesterday afternoon (21 april) when the satellite was flying
>> > over the area Israel, Turkye, Greece.... up to the north towards Europe.
>> >
>> > I made a copy of it with my mini-disc. Several moments the modulation was
>> > even noise free !!! The downlink was at abt. 435.900MHz, so the uplink 
>> is at
>> > abt. 145.900MHz.
>> >
>> > Anybody hear this before ? It must be a relative strong transmitter. I can
>> > not imagine some indoor system will provide such strong uplinks, and noise
>> > free !!
>> >
>> > When needed I will try to make a digital file of the minidisc-record 
>> and put
>> > it on internet. Maybe we can find the pirate :-)
>> >
>> > 73 de PE1RAH, William
>> > ---
>> >
>> >
>> >
>> >
>> >
>> > _________________________________________________________________
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>> > ----
>> > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
>> > Not an AMSAT member? Join now to support the amateur satellite program!
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>> >
>>
>>Scott Townley NX7U
>>Gilbert, AZ  DM43di
>
>
>_________________________________________________________________
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Scott Townley NX7U
Gilbert, AZ  DM43di
http://members.cox.net/nx7u

----
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