Search found 276 matches

by Bob Reite
Fri Jun 22, 2018 10:41 pm
Forum: The Trading Post
Topic: For Sale: BD_PND Bubble Detector
Replies: 2
Views: 1099

Re: For Sale: BD_PND Bubble Detector

As I recall, lifetime is guaranteed to be six months from the date of manufacture, but by paying careful attention to storage instructions, I've usually been able to get a year of of them, although the calibration may not be trustworthy after six months. Not a problem if all you want to prove is tha...
by Bob Reite
Sun Jun 17, 2018 6:11 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Extensive paper on neutron activation
Replies: 12
Views: 1748

Re: FAQ - Extensive paper on neutron activation

https://archive.org/web does a pretty good job of preserving sites from the past.
by Bob Reite
Sun Jun 10, 2018 3:59 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 277 volt power at home
Replies: 5
Views: 1346

Re: 277 volt power at home

Set the lamp to 208 and run it at reduced voltage using a buck transformer. Too bad it doesn't have a tap for 230 or 240 volt
by Bob Reite
Wed Jun 06, 2018 2:06 am
Forum: New User Chat Area
Topic: Annealed copper gasket for hv feedthrough?
Replies: 1
Views: 465

Re: Annealed copper gasket for hv feedthrough?

I never bothered to anneal copper gaskets for installing feedthroughs, just viewports and never had problems.
by Bob Reite
Tue May 29, 2018 10:31 pm
Forum: Announcements and Site Administration Topics
Topic: A bit more on hamfesting (buying and selling)
Replies: 7
Views: 1271

Re: A bit more on hamfesting (buying and selling)

If I go to a 'fest at all this weekend, it will be the Rochester ham fest since it is only half the distance that VA would be from me.
by Bob Reite
Sun May 27, 2018 10:49 pm
Forum: Announcements and Site Administration Topics
Topic: A bit more on hamfesting (buying and selling)
Replies: 7
Views: 1271

Re: A bit more on hamfesting (buying and selling)

I probably should qualify that I can do gull wing and two terminal SMT rework, the most common types encountered. If the bad device is a BGA, forget it! Time for a board swap in that case.
by Bob Reite
Sat May 26, 2018 10:48 pm
Forum: Announcements and Site Administration Topics
Topic: A bit more on hamfesting (buying and selling)
Replies: 7
Views: 1271

Re: A bit more on hamfesting (buying and selling)

I bit the bullet a couple of years ago and bought surface mount rework equipment and learned how to use it. That's because newer broadcast gear is loaded with SMT and unlike consumer electronics, you can't just go to Wally World and buy another for a couple of hundred bucks. So I can fix the newer g...
by Bob Reite
Wed May 23, 2018 2:45 am
Forum: New User Chat Area
Topic: Inner grid size assessment
Replies: 12
Views: 1190

Re: Inner grid size assessment

Oh I remember Doug Coulter finding that a grid half the diameter gave him more neutrons. Not double as I recall, but statistically significant.
by Bob Reite
Sun May 20, 2018 7:52 pm
Forum: The Trading Post
Topic: Andrew Robinson FOR SALE (17/10/15)
Replies: 3
Views: 1022

Re: Andrew Robinson FOR SALE (17/10/15)

Did the meter sell? I can't read the fine print in the photo, I think it says 50 uA, but not sure. Any buyer should be aware that the proper size multiplier resistor will be needed to get this meter to indicate the voltage shown on the scales.
by Bob Reite
Sun May 20, 2018 7:34 pm
Forum: New User Chat Area
Topic: Usable Chamber?
Replies: 5
Views: 702

Re: Usable Chamber?

On the other hand, people have been reporting more neutrons per KV of input with the smaller chambers.