Hi All, I have received an email from Daniel Esteban LU2DDU informing me that about the Arecibo radiotelescope he was in touch with Victor KP4PQ in order to get from him more details about the feed line running from the operating site up to the feed.
Victor says to Daniel that for 432.045 MHz they were using an existing wave guide with the larger side 23" high ( 58 cm ) and 1500 ' long ( about 457 meters long) with a loss of 1 to 1.2 dB i.e. about 1.32 time in power ratio at 432 MHz Please note that the size of the above wave guide can be compared to the air duct of an air conditioning system normally used into a big industrial shed. Considering that the power amplifier was running at best 350 watt it follows that the power reaching the feed was 350 / 1.32 = 265 watt Since the gain of the Arecibo dish is 60 dB or 1000000 time in power ratio it follows that the Arecibo EIRP was 265 MW Tanks to Daniel LU2DDU and Victor KP4PQ for the above information. Best 73" de i8CVS Domenico _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
