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[aprssig] More than one PCSAT?

Robert Bruninga bruninga at usna.edu
Thu Feb 14 14:05:24 UTC 2008


> More than one PCSAT? 

Yes, PCSAT contains two identical redundant transponders.  The
W3ADO-1 side has uplink and downlink on 145.825.  Side B
(PCSAT-11) has secret uplink, but a downlink on 144.39 over
North America (the continent wide APRS channel).  The secret
uplink is available for special applications if anyone can think
of one.

If you see both downlinks on 145.825, then it means the CPU has
crashed an has cross connected the transmitters for
"redundancy".  We must send the command to isolate the two sides
or we are wasting DOUBLE power each time it transmits on either
side.

Actually, PCSAT has a total of FOUR callsigns and FOUR uplink
receivers. And FOUR transponders, but the two UHF uplinks at
9600 baud are kept turned off to save power.  In fact it is the
default ON of these extra two 9600 baud systems that cause PCSAT
to be power negative and therefore only be useable twice a year
in Full sun.  We wont make that mistake again...

Bob, WB4APR

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of 
> Francisco Rogerio Fontenele Aragão
> Sent: Wednesday, February 13, 2008 5:50 PM
> To: aprssig at lists.tapr.org
> Subject: [aprssig] More than one PCSAT?
> 
> Today PCSAT had a pass over Brasilia from 2207 UTC to 2223 
> UTC but Findu showed the following log during the pass:
> 
> 
> 20080213222151 : 
> LW5DGM]CQ,W3ADO-1*,qAo,LW4DEM-4:=3801.42S/05734.03W`73' Via 
> Satelite {UISS50}
> 20080213222107 : 
> W3ADO-1]BEACON,SGATE,qAo,LW4DEM-4:T#128,155,156,065,208,214,00
> 111111,0011,1
> 20080213222022 : LW5DGM]CQ,W3ADO-1*,qAo,LW4DEM-4::EMAIL 
> :peludobueno at yahoo.com.ar
> 20080213221938 : LW5DGM]CQ,W3ADO-1*,qAo,LW4DEM-4::LW4DEM 
> :Hola Jorge Saludos.....
> 20080213221908 : W3ADO-1]APRS4,qAo,LW4DEM-4:Default LT4
> 20080213221907 : 
> W3ADO-1]BEACON,SGATE,qAo,LW4DEM-4:T#126,132,140,143,134,214,00
> 111111,0001,1
> 20080213221900 : 
> N9FLX]APRX46,N9AMN-2*,WIDE3-2,qAo,WB9TLH-12:;PCSAT-11 
> *131309z0000.00N/00000.00W/
> 20080213221847 : W3ADO-1]APRS3,qAo,LW4DEM-4:Default LT3
> 20080213221742 : N9FLX]APRX46,TCPIP*,qAO,WB8NUT:;PCSAT-11 
> *131309z0000.00N/00000.00W/
> 20080213221734 : 
> LW5DGM]CQ,W3ADO-1*,qAo,LW4DEM-4::BLNQSL1/1:W3ADO-1{UISS50}
> 20080213221707 : 
> W3ADO-1]BEACON,SGATE,qAo,LW4DEM-4:T#124,156,157,073,209,214,00
> 111111,0011,1
> 20080213221704 : 
> LW5DGM]CQ,W3ADO-1*,qAo,LW4DEM-4:=3801.42S/05734.03W`73' Via 
> Satelite {UISS50}
> 20080213221413 : 
> PCSAT-11]BEACON,SGATE,qAR,KC8OBZ-2:T#587,135,134,096,128,214,0
> 0111111,1110,1
> 20080213221113 : 
> N9FLX]APRX46,N9AMN-2*,WIDE3-2,qAo,WB9TLH-12:;PCSAT-11 
> *131309z0000.00N/00000.00W/
> 20080213221111 : 
> PCSAT-11]BEACON,SGATE,qAR,KC8OBZ-2:T#586,137,139,138,123,214,0
> 0111111,1101,1
> 20080213220946 : 
> PCSAT-11]BEACON,SGATE,qAo,9Z4GFB-7:T#594,137,139,138,123,214,0
> 0111111,1101,1
> 20080213220855 : 
> PCSAT-11]BEACON,SGATE,qAR,KC8OBZ-2:T#585,142,052,095,063,214,0
> 0111111,1100,1
> 20080213220840 : PCSAT-11]APRS4,qAR,KC8OBZ-2::BLN4PCSAT:In 
> View now. QSY 145.825 for QSO.
> 20080213220758 : PCSAT-11]BEACON,SGATE,qAo,WP4YF:]131456z
reset wb4apr
> 
> How can one understand the beacons of  PCSAT-11  digipeated 
> by KC8OBZ-2 station? How about the beacons of N9FLX?
> 
> 73, Francisco
> PT2TD
> Loc GH64bf  (Lat 15.76020 S, Lon 47.83656 W)
> -- 
> Francisco Rogerio F. Aragão
> 
> 





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