SDR Thermal Stabilization
Alex P
I have the SDR in a remote box rather than running a coax.
In the past, the SDR & USB Extender box had been on a shaded screen porch and was ( by chance ) somewhat temperature stabilized
Over the past several months I have been building and refining highly portable Disk Yagi antennas and for convenience, installed all electronics at the antenna.
What I did not anticipate was that an AirSpy mini SDR is quite sensitive to temperature changes . Not gain, but a significant change in spectral response : the filter shape changes .
Moving forward , I've finally stabilized the SDR by installing it within a small insulated box. June 9th was the first test of the TEC cooled , Resistive heated thermal control system
I've never had such stable data . An example is a spectrum plot set ( 135 ea) over 11 hours where the air temp changed from a morning low of 74F to a late afternoon high of 102F in the sunlit area around the SDR box ...
The large shift was due to the Sun transit within ~ 4 deg of the Declination +20 drift scan. It provides a nice separation of the 5 minute duration spectra scans.
cretaceou...@gmail.com
Folks:
For what it's worth …
My local PBS station is currently airing the film "SMALL TOWN UNIVERSE". The film is being presented as part of the "REEL SOUTH" series. Here in North Carolina the screening of this film started at 2200 EDT.
So I understand that by the time this message makes it to the
list its going to be finished.
<=30=> 🙁
You are going to need to admit that at last I tried. (I've been
told many many times that I am very trying.)
Now I understand that only some of you folks will know why I'm
bringing the screening to the SARA List-Server. I don't have time
to type an explanation at this time.
It appears that this film has been edited "For content" and to fit the allocated time slot.
Clear skies and gentle breezes,
tdj
-- Take care, Tom Jacobs Wilmington, North Carolina mailto:cretaceou...@gmail.com KD4BFQ The best minds are not in government. If any were, business would steal them away. -- Ronald Reagan
Ciprian Sufitchi
The movie was released at Tribeca film festival a few days ago, and has been awarded with best documentary feature, best cinematography and best editing.
Summary: “A remote, disconnected zone in West Virginia is home to one of the world's most sensitive telescopes and a community of vibrant individualists, who have found refuge in the quietest town in America.”
You will recognize the narrator – Dr. Jay Lockman
Trailer: https://vimeo.com/1091456783
Chip
Ciprian Sufitchi
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Clint Jeffrey
Sent: Friday, 13 June 2025 3:31 PM
To: sara...@googlegroups.com <sara...@googlegroups.com>
Subject: [SARA] New documentary about GBT: The End of Quiet
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Clint Jeffrey
To: sara...@googlegroups.com <sara...@googlegroups.com>
Subject: RE: [SARA] FWIW: Small Town Universe is airing on my local PBS station
Clint Jeffrey
Sent: Friday, 13 June 2025 3:36 PM
To: sara...@googlegroups.com <sara...@googlegroups.com>