[amsat-bb] PSAT- transmission sequence

[Paul Stoetzer]

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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>
>
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