Search found 265 matches

by Bob Reite
Mon May 25, 2020 12:54 am
Forum: Announcements and Site Administration Topics
Topic: HEAS 2020 the 31st year ????
Replies: 6
Views: 300

Re: HEAS 2020 the 31st year ????

I was hoping to attend HEAS for the first time this year, but up in the air due to the COVID-19 situation.
by Bob Reite
Mon Apr 20, 2020 10:19 pm
Forum: Items wanted
Topic: Edwards TAG controller
Replies: 6
Views: 625

Re: Edwards TAG controller

Or at least test your link in preview before submitting the post.
by Bob Reite
Mon Apr 20, 2020 10:18 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Solderless Grid Design with Shaft Coupler
Replies: 8
Views: 896

Re: Solderless Grid Design with Shaft Coupler

I found that the graphite end cap grids can take at least 500 watts input without trouble, while 400 watts was the maximum dissipation for the "traditional" wire loop grid.
by Bob Reite
Thu Apr 09, 2020 12:04 am
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 100
Views: 9558

Re: Coronavirus pandemic

I haven't been working on the fusor because now that the weather is warm enough to work outside comfortably I have been clearing more of the brush from around the vertical amateur radio antenna and the neglected vegetable garden. I'm more serious about gardening this year. Just got done putting up a...
by Bob Reite
Fri Mar 20, 2020 10:25 pm
Forum: Vacuum Technology (& FAQs)
Topic: Beware of shipping costs!!
Replies: 8
Views: 730

Re: Beware of shipping costs!!

Agreed, if it's less than 12 oz and can go first class small parcel, that is the way to do it.
by Bob Reite
Wed Mar 18, 2020 7:18 pm
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 100
Views: 9558

Re: Coronavirus pandemic

Yep, I will probably spend more time on fusor development as well. Not going to any studio locations unless it's an off the air emergency that can't be handled remotely. As far as transmitter sites, by and large they are unattended these days, so I consider them safe to visit as there is no human co...
by Bob Reite
Wed Mar 18, 2020 7:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: Beware of shipping costs!!
Replies: 8
Views: 730

Re: Beware of shipping costs!!

USPS still does have "parcel post" now called "USPS Retail Ground". But I believe that you have to drag the thing down to the post office to send it, something a large company isn't going to want to bother with.
by Bob Reite
Wed Mar 18, 2020 6:55 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HF switcher supply construction and voltage multiplication
Replies: 25
Views: 2937

Re: HF switcher supply construction and voltage multiplication

LOL! Reminds me of the very first AM solid state transmitter. No protection for the output devices. The MW-1A model got the protection diodes. I suggest that you do the same.
by Bob Reite
Fri Mar 13, 2020 6:55 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 86
Views: 8512

Re: Jim Kovalchick -My attempt at smaller fusor

Yes. a bidirectional tvs does eliminate the need for two devices. I would choose a breakdown value about twice the highest voltage you expect to read under normal conditions.
by Bob Reite
Mon Mar 09, 2020 7:30 pm
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 86
Views: 8512

Re: Jim Kovalchick -My attempt at smaller fusor

The 10 ohm current sample resistor is a nasty point for transients. During an arcing event, that point tries to go to a very high reverse voltage. I lost a digital meter there. After that I installed 10 K series resistor in the ungrounded side going to the DMM, then put a 10 volt TVS diode across th...