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
On 3/30/21 5:42 PM, Magnus Danielson wrote:
What *is* a challenge (and hasn't really been solved) is how to do
cryogenic feeds in mass production. DSN looked at building an array
of 100 receivers, and nobody would sign up to delivering 100
cryocoolers that would have sufficient MTBF. But
Jim, how large is the Goldstone antenna to which you referred?
Dana
On Tue, Mar 30, 2021 at 4:01 PM Lux, Jim 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
Hi Jim,
On 2021-03-31 01:33, Lux, Jim wrote:
> On 3/30/21 2:56 PM, Wes wrote:
>> You would know better than I, but I was thinking of physical size;
>> 100m v. 70m.
>>
>> Obviously a BIG difference in TX power.
>>
>> Wes
>
>
> It's all about EIRP, baby.
>
> I know they're talking about half a
On 3/30/21 2:56 PM, Wes wrote:
You would know better than I, but I was thinking of physical size;
100m v. 70m.
Obviously a BIG difference in TX power.
Wes
It's all about EIRP, baby.
I know they're talking about half a megawatt for GB, but I don't see it
happening. They've spent so much
You would know better than I, but I was thinking of physical size; 100m v. 70m.
Obviously a BIG difference in TX power.
Wes
On 3/30/2021 2:00 PM, Lux, Jim 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
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
I see several parallels between Arecibo's construction vs its actual use,
and GPS deployment vs actual use.
Arecibo was actually built using ARPA and US Navy funding as a way of
conducting ionospheric research - to benefit military communication over
radio and develop over the horizon radar
Was a pity. China's FAST is receive only. I believe that leaves Green Bank as
the biggest transmitting telescope.
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
A lot of the gear, such as the MASER, was in buildings on the ground which
suffered little or no damage.
Tom Holmes, N8ZM
-Original Message-
From: Bob kb8tq
Sent: Tuesday, March 30, 2021 8:40 AM
To: ew ; Discussion of precise time and frequency measurement
Subject: [time-nuts] Re:
Arecibo's long-standing maser (Symmetricom MHM-2010) died right at the end
of 2018.
In communications with the mfr it came to pass that "repair" was deemed to
be economically
infeasible. so the observatory fell back on a FS725 locked to PPS from a
CNS Clock II,
both of which I had purchased a few
Hi
Based on what’s known publicly, the gear that was not destroyed is still
siting there waiting for a decision about “what’s next”. There are a lot of
ideas kicking around.
Bob
> On Mar 30, 2021, at 7:06 AM, ew via time-nuts
> wrote:
>
> GOOD Morning Tom
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.
Poul-Henning,
On 2021-03-30 10:15, Poul-Henning Kamp wrote:
>
> Magnus Danielson writes:
>
>> A number of different approaches to new SI definition of Hz (was second)
>> was put forward, by among others me, and that range from a single
>> species to actually use a ensemble of species.
Magnus Danielson writes:
> A number of different approaches to new SI definition of Hz (was second)
> was put forward, by among others me, and that range from a single
> species to actually use a ensemble of species. The later would have a
> benefit in using the advancement of several
Hi,
On 2021-03-30 05:38, Hal Murray wrote:
> https://www.npr.org/2021/03/29/982417680/researchers-are-one-step-closer-to-red
> efining-the-second
> Audio is 2:54
>
> Researchers with the Boulder Atomic Clock Optical Network Collaboration are
> one step closer to replacing the current atomic
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