[NLRS] Question on Arecibo dish

[Fast Eddie]

1000' or 305m dish @ Arecibo

At 432 mhz it has about 60 dbi gain....

Eddie VE3KRP






On 5/10/2010 10:11 AM, tosca005 at umn.edu wrote:
>
> Hmm... Jon sez 305 meters, Barry sez 300 feet. It is 305 Meters, from what
> I see on the Internet.
>
> I seem to recall that on the AMSAT reflector, they were saying that the
> gain on 432 MHz was about 80 dB.
>
> Would it be 24x as much on 1296 MHz (24 x 432 = 10368)? That's about 14 dB
> more added onto 80 dB = 94 dB. Seems a bit high to me.
>
> These articles...
>    http://www.naic.edu/~astro/aotms/performance/AO_perf_oct02.shtml
>    http://adsabs.harvard.edu/full/1996ASPC..106..389V
>
> ...talk about the performance of the Arecebo dish on various frequencies,
> but I could not find a simple dB gain figure in there...
>
> On May 8 2010, Barry VE4MA wrote:
>
>    
>> I am not sure how much to derate it because it is a spherical dish
>> ...but it would be about 83 dB if the surface accuracy and mesh was
>> good.....the 300 ft dish is  W VA should be about 79 dB and it is
>> more than accurate enough.
>>
>> Beamwidths way less than 0.1 degree
>> 73
>> Barry VE4MA
>>
>> -----Original Message-----
>> From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
>> Behalf Of w0zq at aol.com
>> Sent: May 8, 2010 11:57 AM
>> To: nlrs at mailman.qth.net
>> Subject: [NLRS] Question on Arecibo dish
>>
>> Can someone tell me what the gain is for the 305m Arecibo dish on X band ?
>> Approximate number is good enough.
>>
>> 73, Jon
>> W0ZQ
>>      
> ______________________________________________________________
> NLRS mailing list
> Home: http://mailman.qth.net/mailman/listinfo/nlrs
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:NLRS at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>