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@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@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
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@usna.edu To: AMSAT BB amsat-bb@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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Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open
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reflect
the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum
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to all interested persons worldwide without requiring
membership. Opinions expressed
are solely those of the author, and do not reflect the
official views of AMSAT-NA.
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