[aprssig] Sidebar -- Re: PSAT digipeater is ON

Ev Tupis w2ev at yahoo.com
Tue Jun 2 22:43:43 CDT 2015


Bob...does this bird accept PSK31 on 10 meters/USB and repeat it on VHF FM as PSK31 on an FM carrier or does it convert it to AX.25? -Ev, W2EV

      From: Robert Bruninga via aprssig <aprssig at tapr.org>
 To: aprssig at tapr.org 
 Sent: Tuesday, June 2, 2015 9:38 AM
 Subject: [aprssig] PSAT digipeater is ON
   
<!--#yiv5260960677 _filtered #yiv5260960677 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv5260960677 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv5260960677 #yiv5260960677 p.yiv5260960677MsoNormal, #yiv5260960677 li.yiv5260960677MsoNormal, #yiv5260960677 div.yiv5260960677MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", "sans-serif";}#yiv5260960677 a:link, #yiv5260960677 span.yiv5260960677MsoHyperlink {color:blue;text-decoration:underline;}#yiv5260960677 a:visited, #yiv5260960677 span.yiv5260960677MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv5260960677 span.yiv5260960677EmailStyle17 {font-family:"Calibri", "sans-serif";color:windowtext;}#yiv5260960677 span.yiv5260960677EmailStyle18 {font-family:"Calibri", "sans-serif";color:#1F497D;}#yiv5260960677 .yiv5260960677MsoChpDefault {font-size:10.0pt;} _filtered #yiv5260960677 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv5260960677 div.yiv5260960677WordSection1 {}-->APRS activists: I forgot to post here on APRSSIG the exciting success of the new APRS satellite, PSAT including its PSK31 Transponder allowing both APRS digipeating and PSK-31 multi-user communications.  Launched on 20 May.  See http://aprs.org/psat.html What we need is more IGates bringing the downlink into the APRS-IS.  So, if you have a spare radio and can run another IGate instance, we invite you to tune it to 145.825.  The satellite signal is weak with only 350 mW, but when it is over your station, it is 10 dB stronger than on the horizon.  A good OSCAR class station has no problems… I don’t expect anyone to wear out their rotators tracking PSAT, no, just a simple vertical over a ground plane will do.  Either a 19” vertical whip over a large 6 foot square ground plane or even better, a 58” vertical monopole over the ground plane.  This ¾ wavelength vertical has almost 7 dBi gain and will pick up signals during the few minutes overhead.  If we have enough of these simple omni monitoring stations/igates then the fact that they only receive near overhead is made up for by the larger number of such simple stations. The larger ground plane (as large as possible) gets closer to the theoretical 3 dB gain of a reflector. Bob, WB4aPR From: Robert Bruninga [mailto:bruninga at usna.edu] 
Sent: Monday, June 01, 2015 9:19 AM
To: amsat-bb at amsat.org
Cc: bruninga at usna.edu
Subject: PSAT digipeater is ON I just turned on the PSAT digipeater.  You will notice that its callsign in this mode is just “PSAT” and not PSAT-1 when it is in SAFE mode.The ALIASes supported are ARISS and APRSAT. The PSK-31 transponder also remains in AUTO mode meaning it will come up whenever there are PSK31 signals on the 28.120 + frequency. Bob, WB4APR
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