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 <j...@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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