[amsat-bb] PSAT Status (day 4)

Mike kc6nhj at charter.net
Wed May 27 18:52:22 UTC 2015

Transponder works well even on a 12-13 degree pass here.  Beacon decodes on
a separate track. TX from 10m SSB shows up separately. You will need to keep
moving your cursor (at least in DM780) to track and decode the SSB.  Now,
all I need is a better pass and someone to answer

73, K7TRK
Following is copy of text for that pass:

"18:30:16> Main
t e
  xADO-5 beacon B 1Ø4 96 23 828 262 +1
 taeRi  in Oregon
e  tlo escdn Oregon
CQ CQ CQ de K7Tte_ X7TRK KPie fht u, r
CQ CQ CQ de K7TRK K7TRK K7TRK  in Oregon
beacon B ØØØ 4Ø 24 832 246 +12  e  la
W3ADO-5 beacon B ØØ1 99 26 821 252 +15 _t t
W3ADO-5 beacon B ØØ2 18 23 821 252 "17   t3ADO-5 beacon B ØØ3 31 23 822 251
W3ADO-5 beaconØao 34 23 827 2C219  _ 
W3ADO-5 beacon B ØØ5 31 23 859 244 +13  (
too   ,i ? tS
U oW
CQ CQ Cm  CQ  aFe"

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Robert
Sent: Sunday, May 24, 2015 9:58 AM
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 tracker
http://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.

PSAT has a single 21" VHF  and 72" long HF whip.  It has two UHF 6"
orthogonal monopoles, all of very thin Nitinol wire.

More details will eventually follow as the page will be  updated over the
coming weeks.  http://aprs.org/psat.html

* PSAT packet telemetry is OK, Digipeater will be off (secondary mission)
* PSAT PSK31 transponder is ON with 28.120 MHz uplink! (primary mission)
* WOD data fixed.  Spin data now available.  Right now it is at 3 RPM with
+Z pointing 45 deg off Sun
* Launch TLE elements (below) are still very good
* http://PCSAT.APRS.ORG  web page is now capturing PSAT telelmetry that
users inject into the APRS-IS
* BRICSAT telemetry has been heard but is cycling OFF due to low power
* BRICSAT PSK31 downlink (also FM) has also been heard barely (when ON)
* USS Langley not heard


PSAT:       145.825 - 1200 baud AX.25 telemetry - digi off
PSAT PSK31-5:  435.350 FM down, 28.120 SSB PK31 uplink - Brno University

BRICsat:  437.975 - 9600 baud telemetry evry 20s BRICsat PSK31-6 - same as
PSAT but PSK TLM on 375 Hz (PSAT on 315 Hz)

USS Langley - 437.475  9600 baud telemetry   <== CORRECTION

ULTRASat3  <these are still tracking well>
1 99993U          15140.67013889  .00040043  00000-0  10235-2 0 00009
2 99993 055.0004 339.9238 0251027 182.3314 074.3075 15.12517086000014

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