[time-nuts] Re: The Collapse of Puerto Rico’s Iconic Telescope [April 5th, 2021 New Yorker]

[Lux, Jim]

On 3/30/21 5:58 PM, Dana Whitlow wrote:
> Jim, how large is the Goldstone antenna to which you referred?

70 meters.

They do bistatic radar with Tx at Goldstone and Rx at Green Bank (and 
Arecibo, when it was live).

What Arecibo had was a monster UHF transmitter (420 MHz) - DSN has big 
S-band and X-band transmitters.

The Solar System Radar is a lesser known aspect of the Deep Space 
Network.  But that's how we knew about Venus's rotation period, etc.


>
> Dana
>
>
> On Tue, Mar 30, 2021 at 4:01 PM Lux, Jim <jim at luxfamily.com> wrote:
>
>> On 3/30/21 6:40 AM, Wes wrote:
>>> Was a pity.  China's FAST is receive only.  I believe that leaves
>>> Green Bank as the biggest transmitting telescope.
>> More likely the Goldstone Solar System Radar function of DSN on the 70m
>> (DSS-14) - 500kW in X band at 8560 MHz
>>
>> There *is* a new transmitter for GB - but it's a demo - 700 W and
>> temporarily installed up at the feed for a test.  I don't know what
>> frequency.  People are pitching a 500kW system, but we shall see.
>>
>>
>>
>>> I remember 417s.  I had them in a copy of a design by W2AZL.  I also
>>> had a two-meter preamp I designed using 416Bs.  Of course uW cooled
>>> preamps are not unusual now, but back then a blower on a receive
>>> amplifier was unusual :-)
>>>
>>> Wes Stewart N7WS
>>>
>>> On 3/30/2021 4:06 AM, ew via time-nuts wrote:
>>>> GOOD Morning Tom  Thank you for the super information Read it over
>>>> and over. To me no joy, sadness for Astronomy, Science, Puerto Rico
>>>> and the US. China is now the leader with a 500 meter unit! Did follow
>>>> it since the seventies because of the low noise receivers. Remember
>>>> the 417 Triodes? I had some for Ham use.
>>>>                         Any body knows what happened to its Maser?
>>>>           Bert Kehren
>>>> _______________________________________________
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