[amsat-bb] PSAT- transmission sequence

Wed May 27 20:15:02 UTC 2015

Thanks Paul,

The doppler would be enough to prevent the decode, but not 
enough to prevent me from seeing the trace, if I hit the 
bandpass. So far I haven't seen anything but the beacon and 
maybe something that looked like one of the MFSK type modes. Do 
you know the frequency of the actual center of the uplink 
bandpass and how wide it is?

73
Mike kc9doa

On 27 May 2015 at 15:53, Paul Stoetzer wrote:

> It is, but your uplink signal is going to be Doppler shifted,
> so it's
> going to drift through the waterfall (+/- 0.7 kHz through a
> pass),
> unless you are controlling your transmit frequency for
> Doppler.
> 
> 73,
> 
> Paul, N8HM
> 
> On Wed, May 27, 2015 at 3:50 PM, Mike Miller <lists at kc9doa.com>
> wrote:
> > Okay, I must be misunderstanding how this works. I thought
> the
> > down link was FM like the beacon which for me is at 308 Hz
> on
> > the waterfall.
> >
> > 73
> > Mike kc9doa
> >
> > On 27 May 2015 at 12:37, Mike wrote:
> >
> >> Mike, I used my day to day DM780 settings. Dial setting
> was
> >> 28.120 and I
> >> just picked the middle of the waterfall to TX.
> >>
> >> On the RX, you need to keep the cursor moving as the trace
> >> moves quickly. It
> >> does not stay in one place like normal psk
> >>
> >> 73, Ted
> >> K7TRK
> >>
> >> -----Original Message-----
> >> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf
> Of
> >> Mike Miller
> >> Sent: Wednesday, May 27, 2015 12:13 PM
> >> To: Robert Bruninga
> >> Cc: amsat bb
> >> Subject: Re: [amsat-bb] PSAT- transmission sequence
> >>
> >> Is the uplink on 28.120 + audio or does the psk31 signal
> need
> >> to be at
> >> 28.120 i.e. 28.119 USB with 1000 Hz psk31?
> >>
> >> I copied some beacons but didn't see anything from my
> attempt
> >> to uplink.
> >>
> >> 73
> >> Mike kc9doa
> >>
> >>
> >> On 27 May 2015 at 10:41, Robert Bruninga wrote:
> >>
> >> > PSAT PSK31 is always in AUTO mode.  It will come up
> whenever
> >> it hears
> >> > PSK31 on the 28.120 uplink.
> >> >
> >> > Bob, WB4APR
> >> >
> >> > On Wed, May 27, 2015 at 9:54 AM, David G0MRF
> >> <g0mrf at aol.com>
> >> > wrote:
> >> >
> >> > > Congratulations Bob and USNA on another successful
> >> > spacecraft.
> >> > >
> >> > > I listened for the first time this morning and could
> hear
> >> the
> >> > beacon and
> >> > > transponded PSK31 without any trouble.
> >> > >
> >> > > But I was not expecting the 435.350 carrier to stop
> every
> >> now
> >> > and again.
> >> > >
> >> > > What determines if the carrier is on or off. - Beacon
> >> > timing.- OK, but is
> >> > > the transmitter also PSK activated in someway? Or is it
> a
> >> > timer.
> >> > > Very nice for saving power.
> >> > >
> >> > > Thanks
> >> > >
> >> > > David  G0MRF
> >> > >
> >> > >
> >> > > -----Original Message-----
> >> > > From: Robert Bruninga <bruninga at usna.edu>
> >> > > To: AMSAT BB <amsat-bb at amsat.org>
> >> > > Sent: Sun, 24 May 2015 17:58
> >> > > Subject: [amsat-bb] PSAT Status (day 4)
> >> > >
> >> > >  PSAT  PSK31 435.350 MHz FM downlink is full quieting
> with
> >> 6
> >> > bars using a
> >> > > decent
> >> > > UHF Yagi.
> >> > >
> >> > > But we have not seen any users other than those using
> the
> >> > 28.120
> >> > > PSK
> >> > > channel on HF normally.  We welcome people to
> experiment
> >> with
> >> > it.
> >> > > Everyone
> >> > > within the 28.120 to 28.123 MHz ten meter passband will
> be
> >> uplinked
> >> > > and heard on the 435.350 MHz downlink.
> >> > >
> >> > > The Naval Academy's PSAT seems healthy with plenty of
> power
> >> (we are
> >> > > keeping the APRS digipeater off to allow max power for
> >> PSK31).
> >> > >
> >> > > PSAT 's radio and packet system are a simple $250 APRS
> >> > > trackerhttp://www.byonics.com/mtt4b sent to space. 
> The
> >> PSK31
> >> > transponder is
> >> > > a
> >> > > single 3.4" square circuit board made by Brno
> Universtiy
> >> in
> >> > the
> >> > > Czech
> >> > > Republic.  The CPU for controlling bulletins and
> timing
> >> is
> >> > a
> >> > > simple
> >> > > Parallax Basic Stamp.
> >> > >
> >> > > PSAT is actually only about a 1U cubesat but in a 1.5U
> >> package since
> >> > > the flight was available and it gave us more power for
> our
> >> NON-SPACE
> >> > > solar cells.  We are using standard silicon that are
> only
> >> half as
> >> > > efficient as multi-junction cells, but only cost 1% as
> >> much.
> >> > >
> >> > >
> >> > >
> >> > _______________________________________________
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> >>
> >> _______________________________________________
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> forum
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> >> interested persons worldwide without requiring membership.
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> >>
> >
> >
> > _______________________________________________
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> available
> > to all interested persons worldwide without requiring
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> official views of AMSAT-NA.
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