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Re: MUF and connecting to sattellites



Hi Eric,

Yes some will pass through.  This used to occur with RS13 in mode T, which
was a 15 meter uplink, 2 meter downlink mode.  There would be times I would
work people who didn't know they were going through a satellite. They were
hearing me direct on 15 meters.  So the signal was being refracted by the F
layer, but I was still making it into the satellite as well.

73s John NE0P

----- Original Message -----
From: "Christensen, Eric H" <CHRISTENSENE@MAIL.ECU.EDU>
To: "Jerry Weihrauch" <k0hzi@comcast.net>; "AMSAT-BB" <amsat-bb@amsat.org>
Sent: Sunday, August 07, 2005 4:37 PM
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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> ----
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----
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