Search found 611 matches

by Steven Sesselmann
04 May 2015, 07:29
Forum: Introductions
Topic: intro
Replies: 1
Views: 1132

Re: intro

Boris,

Great to see you have transferred from the old forum, sorry that your post was left unanswered, you are of course welcome.

Steven
by Steven Sesselmann
03 May 2015, 20:33
Forum: Detectors
Topic: Making a New Batch of Detectors
Replies: 5
Views: 2397

Re: Making a New Batch of Detectors

Karl,

Yes, I could easily cut a hole in the base of a 2" tube or shorten it if required. You find the tubes under Parts and Accessories in the store.

Steven
by Steven Sesselmann
03 May 2015, 20:29
Forum: Spectrum
Topic: NaI(Tl) not sealed this is what happens.
Replies: 3
Views: 1764

Re: NaI(Tl) not sealed this is what happens.

Luuk, Yes I learned this the hard way, now I do it excactly what you suggest, turning the lathe by hand, and that works, when I am almost through, I just use a Stanley knife to cut through the rest. As for the lathe, I sprayed it with WD40 and gave it a good cleanup, and it's still usable. Hopefully...
by Steven Sesselmann
03 May 2015, 17:49
Forum: Detectors
Topic: Making a New Batch of Detectors
Replies: 5
Views: 2397

Re: Making a New Batch of Detectors

Karl, There is a tooling cost associated with metal spinning. For each size they make a steel die onto which the aluminium is spin formed, they more or less start off with a round disk and gradually stretch it over the die into a cup. Obviously one can't have any undercuts as the die needs to be rem...
by Steven Sesselmann
03 May 2015, 10:49
Forum: Introductions
Topic: G'day everyone from John
Replies: 7
Views: 2727

Re: G'day everyone from John

John,

That would be great.., and sure, the forum now handles pdf attachments..

Steven
by Steven Sesselmann
03 May 2015, 10:24
Forum: Spectrum
Topic: NaI(Tl) not sealed this is what happens.
Replies: 3
Views: 1764

Re: NaI(Tl) not sealed this is what happens.

Luuk, Yes it melts away, and it's also worth mentioning that NaI(Tl) is extremely corrosive. A few years ago I was trying to open a sealed aluminium detector by cutting it open in my lathe, this was a pretty bad idea, because it jammed and broke the crystal, which shattered, and bits landed all over...
by Steven Sesselmann
03 May 2015, 10:08
Forum: Spectrum
Topic: pmt or maybe a bulb?
Replies: 1
Views: 991

Re: pmt or maybe a bulb?

Luuk,

Very cool, thanks for posting, must try this next time I have a dead PMT.

Steven
by Steven Sesselmann
03 May 2015, 09:50
Forum: Introductions
Topic: Hallo
Replies: 2
Views: 1533

Re: Hallo

Paolo,

Thanks for registering on the new forum and welcome, for those of you who don't know, Paolo (happynewgeiger) has been closely involved with the Theremino project since the beginning.

Steven
by Steven Sesselmann
02 May 2015, 21:54
Forum: Introductions
Topic: G'day everyone from John
Replies: 7
Views: 2727

Re: G'day everyone from John

John, Thanks for migrating to the new forum, and sharing your efforts, it is just amazing how many clever ideas you guys have come up with to improve your spectra. Stabilizing the temperature at the detector end has always been tricky, but your solution sounds simple, and it would be great if you ca...
by Steven Sesselmann
02 May 2015, 21:47
Forum: Detector drivers
Topic: Software Defined Radio instead of sound card?
Replies: 4
Views: 3460

Re: Software Defined Radio instead of sound card?

Pieter, I was just watching this video on the hackRF https://youtu.be/4Lgdtr7ylNY and Michael Ossman mentioned one could tap directly into the baseband analog port with a signal +- 1V, that's pretty much in the range of a PMT signal output, and sample at 20 MHz. Since I don't have one of these devic...