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May 30 International Space Station pass over Arlington during school telebridge contact


Michael Callaham
 

Yesterday, April 27, Kim KD9XB sent me the text of an unattributed tweet which summarizes the info now reported in ARISS News Release No. 20-03 (which you may read--do read it--on www.ariss.org ) and also suggests that AB1OC, in New Hampshire, is the station that will provide the radio link to the space station.

As it happens, the ISS will also be "visible" from Arlington at the same time, so you may be able to hear it (details below).

ARISS News Release No. 20-03 also invites the public to watch the pass on the new ARISS YouTube Channel at

https://youtu.be/Cu8I9ose4Vo

My Gpredict software, using data (Keplerian elements) refreshed this morning, predicts the half-minute-by-half-minute azimuth and elevation of the ISS from my location:

Observer: NW3V, Arlington, Virginia
LAT:38.90 LON:-77.15
...

  Orbit 22462
--------------------------------------------
 Time                  Az      El  Range Vis
--------------------------------------------
 2020/04/30 13:35:00 315.66   0.00  2366  D
 2020/04/30 13:35:31 317.92   1.84  2171  D
 2020/04/30 13:36:01 320.62   3.83  1978  D
 2020/04/30 13:36:32 323.88   6.00  1791  D
 2020/04/30 13:37:03 327.89   8.40  1610  D
 2020/04/30 13:37:34 332.93  11.05  1439  D
 2020/04/30 13:38:05 339.36  13.96  1282  D
 2020/04/30 13:38:36 347.64  17.04  1144  D
 2020/04/30 13:39:07 358.24  20.02  1034  D
 2020/04/30 13:39:38  11.31  22.33   961  D
 2020/04/30 13:40:08  26.12  23.26   934  D
 2020/04/30 13:40:39  41.00  22.42   957  D
 2020/04/30 13:41:10  54.21  20.15  1028  D
 2020/04/30 13:41:41  64.97  17.18  1136  D
 2020/04/30 13:42:12  73.38  14.08  1272  D
 2020/04/30 13:42:43  79.90  11.14  1429  D
 2020/04/30 13:43:14  85.01   8.46  1599  D
 2020/04/30 13:43:45  89.07   6.04  1780  D
 2020/04/30 13:44:16  92.35   3.85  1967  D
 2020/04/30 13:44:46  95.06   1.84  2159  D
 2020/04/30 13:45:17  97.33  -0.00  2355  D

The downlink frequency should be 145.8 MHz (plus and minus a few kHz of Doppler shift) and the mode is FM. You should be able to hear it on an HT, ideally in a high, unobstructed place or using a high, unobstructed antenna. The maximum elevation, from here, is not very high, 23.26 degrees, so obstruction can definitely be a problem, and the minimum range is not as short as it may be at AB1OC.

73,
--Mike NW3V