I have not yet heard what GB wants to do, but if it's long range work
(return time of
10's of sec or longer), the problems related to T/R switching, Tn
degradation of the
receiver, etc, get a lot more tractable than one might suppose.
At Arecibo, the S-band radar was intended solely for long
During my days at UTC I was among other things responsible for our Industrial
Laser Group. We sold some 50 KW CW CO2 lasers! We had the only aero dynamic
window that allowed a vacuum on one side. When not in use you put a pencil
through it. Patented.
On 3/31/2021 11:57 AM, Lux, Jim wrote:
In some ways it's like high power laser labs. It's not the direct beam
you worry about - nobody is going to put their hand in the beam path.
It's the stray reflection when something gets bumped and falls across
the optical bench and reflects a stray
On 3/31/21 11:33 AM, Wes wrote:
On 3/30/2021 4:33 PM, 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
-nuts] Re: The Collapse of Puerto Rico’s Iconic Telescope [April
5th, 2021 New Yorker]
On 3/30/2021 4:33 PM, 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 differ
On 3/30/2021 4:33 PM, 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 megawatt for GB, but I don't see
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
: The Collapse of Puerto Rico’s Iconic Telescope [April
5th, 2021 New Yorker]
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
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.
19 matches
Mail list logo
