[amsat-bb] PSAT- transmission sequence
bruninga at usna.edu
Wed May 27 14:41:57 UTC 2015
PSAT PSK31 is always in AUTO mode. It will come up whenever it hears PSK31
on the 28.120 uplink.
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.
> 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
> UHF Yagi.
> But we have not seen any users other than those using the 28.120
> channel on HF normally. We welcome people to experiment with it.
> 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
> PSAT 's radio and packet system are a simple $250 APRS
> trackerhttp://www.byonics.com/mtt4b sent to space. The PSK31 transponder is
> single 3.4" square circuit board made by Brno Universtiy in the
> Republic. The CPU for controlling bulletins and timing is a
> 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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