Adjustments to pulsar array

Marcus Leech went “up top” to make some elevation adjustments to the now-twice-the-size pulsar array,
and added a cross-brace to the “upper” side of the array to stiffen it.

There’s been a fair amount of RFI on the 611MHz radio-astronomy ‘window’, so we’re trying to track it down.

Meteor-cam now in operation on the roof

Gary Atkins moved one of two all-sky camera systems onto the roof late last week. These camera systems are designed for detecting meteors, and we’ll be joining a “network” of such meteor cams around the world.

We’ll have a live feed of the camera pointed to from the website soon–but there are a few housekeeping details that need to be taken care of first.

We may also put a regular webcam “up top” just to show images of the antennae up on the roof. It will be boring, most of the time 🙂

Roof now has 21cm telescope on it as well

Gary Atkins and Marcus Leech moved the 21cm dish “up top” today, so that it can join the pulsar antenna.

We used a rope and brute force. This won’t work for our 1.2m dishes and their mount pods–not without a hoist of some sort.

The next antennae to go “up top” will likely be our UHF interferometer antennae, probably spaced about 30m apart or more.

Pulsar monitor undergoing overnight checkout

The pulsar antenna is now plugged into the pulsar receiver system, which consists of a pair of AirSpy SDR receivers, fed with a high-quality 10MHz OCXO timebase.

We’re running a pulsar-specific flow-graph, written by Marcus Leech, and using Gnu Radio underneath.

There are many unknowns–we don’t know if the ambient noise level is low enough without aggressive filtering, we don’t know if our antenna effective aperture is quite up to the task. This will be a useful test, but a negative result cannot be interpreted to mean “won’t work”.

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