Hi Nick, K5QXJ

Is your KLM 436 a linearly polarized antenna or a circularly polarized antenna ?

If it is circularly polarized switch polarization to LHCP because Arecibo transmit RHCP toward the moon but the moon reflect back isotropically a signal in LHCP

If your KLM 436 is linearly polarized no matter if it is horizontal or vertical because Arecibo comes to you circularly LHCP

About the sun-noise supposing that the gain of your antenna is 16 dBi corresponding to the gain of a dish with diameter of 6.5 feet and that the sun activity yesterdat 16 April was 75 sfu at 2800 MHz (10.7 cm) using the program NOISE.EXE with 75 kelvin for your 1 dB of NF for preamplifier and 70 kelvin for the antenna temperature with the elevation of the sun 75° it outcomes that the sun-noise you should receive as a (S+N)/N ratio is 2.8 dB maximum

So you receive the right sun-noise figure from your system no matter if the antenna is linearly or circularly polarized because the sun-noise is a uncoherent signal no polarized.

In a separate email I have sent to you the software NOISE.EXE a very simple but powerful program working in DOS

73" de

i8CVS Domenico

----- Original Message ----- From: "Nick Pugh K5QXJ" quadpugh@bellsouth.net To: amsat-bb@amsat.org Sent: Saturday, April 17, 2010 1:09 PM Subject: [amsat-bb] Arecibo

Hi All

I have a KLM 436 with < 1 db preamp I did not here them yesterday. I have about 2 db of sun noise. The question I have for those who copied Arecibo yesterday how much sun noise do you have in a 2.4 KHz band with filter?

Thanks

nick

Office 337 593 8700

Cell 337 258 2527

Helping UL become a world Class Engineering and Educational School

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