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Re: SUISAT forensics...



At 05:24 AM 2/8/2006 +0100, i8cvs wrote:
>----- Original Message -----
>From: "Luc Leblanc VE2DWE" <lucleblanc6@videotron.ca>
>To: <amsat-bb@amsat.org>
>Sent: Wednesday, February 08, 2006 3:56 AM
>Subject: [amsat-bb] SUISAT forensics...
>
>> It will be interresting to calculate how much ERP power is present on
>Suitsat
>> to produce the actual results and make some test to replicate the possible
>> causes.
>
>> Luc Leblanc VE2DWE
>> AMSAT 33583
>> Skype VE2DWE
>> www.qsl.net/ve2dwe
>
>Hi Luc, VE2DWE
>
>If we know exactly the 2 meters ground station antenna gain in dB
>as well the overall noise temperature of the 2 meter receiving system
>in degrees kelvin or alternatively we know it's overall Noise Figure
>in dB than if we measure the ratio (S+N)/N of the received signals
>in dB and we know the range at that time of measurement it is possible
>to calculate with sufficient approximation how much ERP power
>is present on Suitsat.
>
>Best 73" de
>
>i8CVS Domenico
>----

OK here are some numbers to crunch:
My observations of Suitsat at approx 1104utc 4Feb.
signal S+N/N = 12 dB  (3 s-units over noise floor)
system NF = 0.74 dB
antenna gain = 21.3 dBi (vert-pol)
range at closest approach = 1354km
FM mode (15KHz BW)
elevation angle = 9 deg
Tamb = -12C

Have fun!
73's,
Ed - KL7UW  
=========================================
http://www.qsl.net/al7eb - BP40iq 
144-EME: FT-847, mgf-1801/1402, 4xM2-xpol-20, 170w
432-EME: FT-847, mgf-1402, 1x21-ele (18.6 dBi), 60w
=========================================
----
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