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Re: AMSAT has a SECRET: why not 10m instead of V band



The satellite sub-band widths are:

10 m   210 kHz
2 m    200 kHz
70 cm  3 MHz
23 cm  10 MHz uplink only
13 cm  20 MHz
9 cm   20 MHz uplink and 20 MHz downlink
3 cm   50 MHz
12 mm  50 MHz

73,

John
KD6OZH

----- Original Message -----
From: "Jon Ogden" <na9d@speakeasy.net>
To: <sco@sco-inc.com>; <amsat-bb@AMSAT.Org>
Sent: Saturday, 02 June 2001 01:57 UTC
Subject: Re: [amsat-bb] AMSAT has a SECRET: why not 10m instead of V band


> Leslie,
>
> The biggest problem with a 10m downlink is the bandwidth of the passband.
>
> The 10m satellite sub-band is quite small.  The S-band downlink sub-band
is
> much larger (I am not sure how much).  If you try to link something like L
> band to 10 m, you will only be able to use a very small portion of the
> uplink passband.
>
> This is another reason why 2m is rapidly losing favor as a band of choice
> (although I personally would like to see it stay for the next bird or two)
> for HEO satellite work.
>
> AO-40 has a 10m downlink because it was going to have a 2m uplink.  Come
to
> think of it, the HF bands haven't been tried on AO-40 yet, so we could do
2
> up, 10 down and I think the IF matrix could even connect them separately
> from the U/S and L/S combinations (I am not positive, but I think it
could).
>
> Your idea does have a good thought at heart.
>
> 73,
>
> Jon
> NA9D
>
> on 6/1/01 10:41 AM, sco@sco-inc.com at sco@sco-inc.com wrote:
>
> > I might do away with a 2m link in favor of a 10m downlink capability.
That
> > way any ham or SWL who has a general coverage receiver 160-10m will be
able
> > to hear the satellite. Once they hear it they might get interested and
want
> > to talk thru it too. I would suggest that more people  (hams and SWLs)
have
> > a general coverage HF receiver as compared to an all mode VHF receiver.
> > They are less expensive to buy too.
> >
> > A 10m downlink could be heard well on a dipole antenna.
> >
> > Make a satellite in an AO-40 orbit (that was planned).
> > With 10m and S band downlinks.
> > With U and L band uplinks.
>
>
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
>
> Member:  ARRL, AMSAT, DXCC, NRA
>
> http://www.qsl.net/ke9na
>
> "A life lived in fear is a life half lived."
>
> ----
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