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Re: RE: MUF and connecting to sattellites



You could say that, for satellite/space communications, the MUF is the Minimum Un-Usable Frequency below which very little signal will pass through the ionosphere.

Félim M3HIM

> 
> From: "Christensen, Eric H" <CHRISTENSENE@MAIL.ECU.EDU>
> Date: 2005/08/07 Sun PM 04:37:19 GMT
> To: "Jerry Weihrauch" <k0hzi@comcast.net>,  "AMSAT-BB"
>   <amsat-bb@amsat.org>
> Subject: RE: [amsat-bb] MUF and connecting to sattellites
> 
> Jerry,
> Don't know if anyone replied to your e-mail but I'll try to explain MUF and
> how it could affect satellite communications.
> 
> Basically the MUF (Maximum Usable Frequency) is the maximum frequency the
> atmosphere will return to earth.  Any transmissions above the MUF will pass
> through the atmosphere.  So there shouldn't be a problem with MUF at 14MHz
> because you WANT your 29MHz signal to pass through the atmosphere.  Now, I'm
> not exactly clear on what happens when the MUF is above the 29MHz satcom
> frequency.  I would assume that some of your signal would pass through the
> atmosphere and not all of it would be deflected.  But I'm not sure about that.
> I'll have to do some more research on that part.
> 
> 
> Eric KF4OTN
> 
> 
> ________________________________
> 
> From: owner-AMSAT-BB@AMSAT.Org on behalf of Jerry Weihrauch
> Sent: Fri 05-Aug-05 08:48
> To: AMSAT-BB
> Subject: [amsat-bb] MUF and connecting to sattellites
> 
> 
> 
> Does the MUF effect how well one gets their signal to a satellite like
> PCSat2 on 29.400?
> For instance the MUF around my QTH is about 14 MHz at 12:35 UTC this
> morning.
> Want to try the 13:30 UTC pass today for PSK31 test.
> 
> 73,
> 
> Jerry   -  K0HZI
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