APRS Satellite Live Telemetry Links
Captured on 145.825 MHz


Bob Bruninga, WB4APR, Instructor, US Naval Academy (bob at aprs dot org)
Steve Dimse, K4HG - Designer of FINDU.com

This page links to all live downlinks from all the APRS satellites being captured by volunteer ground stations around the world as part of the APRS-Internet System (APRS-IS). These packets are captured by Steve, K4HG's FINDU.COM system. But first, here are the USNA APRS satellites that have de-orbited (PCSAT launched 2001 is still alive):

  • PCSAT2 Aug 2006: Description page, Operations page
  • ANDE . . Dec 2007: Description page, Operations page
  • RAFT. . May 2007: Description page, Operations page, and the Final-days page.

    SatGate Statistics: KE6BLR sorted all of the ground station data by the number of packets heard during July. We hope to fill in the table to help understand the difreence between omni-no-track stations and full track stations.

    Your Next Pass: KE6BLR has also written a pass predictor for the next APRS satellites for your location! This data shows that with the 6 active APRS satellites on orbit, generally half the time, you are no more than 30 minutes from the next pass, 75% of the time you are less than 60 minutes to the next pass and 93% of the time your next pass is within 90 minutes as shown at right.

    NEW: Geostationary APRS in Europe:
    OE3DMB, Andy has experimented successfully with APRS mobile
    via the Eastern hemisphere Geostationary AMSAT QO-100.
    He uses CHIRP modulation to achieve a good link from an omni
    antenna on the roof of his car. Uplink is on 2.4 GHz
    and downlink is on 10 GHz band. See his lengthy paper.

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    PSAT3 (USNA) had APRS relay, DTMF Grid and Messaging, Voice synthesizer & SSTV in a PPOD box:
    LAUNCH CANCELED! Launch provider failed to meet launch deadline of first launch on 2 Mar
    So second launch (us) is canceled and that ended the DARPA launch challenge program.
    So, PSAT3, is on display in our lab (with live telemetry and on the APRS channel) & for any future opportunities.

  • PSAT3 Description page. See photo in glass case.
  • Telemetry last 12 hrs. .
  • Bus Volts, and Volt-thresholds. Batt charge current, Batt load current, and How to read current.
  • Z+temps, Z-temps,
  • Telemetry Counter (minutes, 000 to 999)(on the air for APRS demo).

    PSAT2 (NO-104) on 435.350 MHz SSTV and PSK31 downlink:
    Launched 25 Jun 2019. 28 degree, 860/300 km orbit. VHF AX.25 downlink failed in August.
    Problem was my fault. Wiring a 4 volt XCVR module to 5v!
    UHF is working fine. SSTV is automatic and PSK31 uplink is on 29.4815 MHz.

  • PSAT2 description page
  • Telemetry last 12 hrs. . Last heard on 23 Aug.
  • Last User DTMF Grid/MSGS.
  • Slow Scan SSTV camera image gallery
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    BRICSAT2 (USNAP1)(NO-103) on 145.825 and [USNA14 on 437.605]:
    Launched 25 June 2019 into 28 degree eliptical orbit, 860/300 km with PSAT2. Unable to turn on Digi.

  • USNAP1 description page
  • Telemetry last 12 hrs (USNAP1)
  • User communication packets - Digipeater is OFF until propulsion experiments are complete
  • Bus Volts (All other telemetry is on UHF), and Volt-thresholds
  • Telemetry Counter (minutes since last reset or rollover).
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    PSAT (NO-84) (USNA) on 145.825 MHz:
    Launched 20 May 2015 into 55 degree circular orbit at 450 km?

  • PSAT description page
  • Telemetry Last 12 hours (PSAT), or
  • User communication packets
  • Bus Volts,
  • Z+temps, Z-temps,
  • Batt Current
  • Telemetry Counter (minutes since last reset or rollover).

    PCSAT (NO-44) (USNA) on 145.825 MHz: Also known as W3ADO-1
    Launched 30 Sept 2001 into 67 degree circular orbit at 800 mile altitude

  • PCSAT description page
  • Telemetry Last 72 hrs (W3ADO-1), and
  • User communication packets
  • Telemetry Counter (minutes since last reset or rollover).

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    ARISS on International Space Station on 145.825 MHz:
    Amateur Radio on ISS switched to APRS freuqency during 2007 and operational ever since (mostly)

  • ARISS description page
  • User communication packets

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    India's AISAT-1 on 145.825 MHz:
    Lanched on April 1st 0357z attached to the upper stage of the PSLV C45 mission. It is in a polar orbit with local passes everywhere 2 or 3 times in a row and then another 2 or 3 twelve hours later.

  • AISAT-1 description page
  • Telemetry Last 72 hrs (AISAT-1), and
  • User communication packets

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    LAPAN-ORARI (IO-86) - APRS digipeater on 145.825 and FM Voice transponder on 435.880/down and 145.880 MHz up.

    Launched in Sept 2015, into a 6 degree inclination 650 km orbit that only serves equitorial regions but does so every 110 minutes near the equator and once a day up to latitudes of 30 deg. The digipeater is a powerful 5W output.

  • LAPAN-ORARI description page
  • Telemetry last 48 hrs (YB0X-1)
  • User communication packets
  • Telemetry Counter (minutes since last reset or rollover).

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    FalconSAT-3 - Special 9600 downlink on 435.103 MHz:

    Launched in 2006, into a 35.4 degree inclination orbit, with an altitude of about 470 km. Supports APRS digipeating but also hosts a Packet Bulletin Board System at 9600 baud with a 145.840 uplink, and 435.103 downlink. Output power is 1 watt.

  • FalconSAT-3 description page
  • Telemetry last 48 hrs (PFS3-1)
  • User communication packets

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