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1. Re: [Amps] Need G-10 board material (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Thu, 05 Jan 2006 15:17:56 -0500
Try McMaster Carr. They have 12 by 12 inch sheets in many thicknesses for a few bucks, each. http://www.mcmaster.com/ _______________________________________________ Amps mailing list Amps@contesting
/archives//html/Amps/2006-01/msg00188.html (6,790 bytes)

2. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Thu, 05 Jan 2006 17:08:54 -0500
The neutral carries load current, so it may have some voltage drop at the appliance end, compared to the end at the power panel. And if it ever goes high resistance, then the moment any load is conne
/archives//html/Amps/2006-01/msg00191.html (7,529 bytes)

3. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 11:58:22 -0500
All neutrals and equipment grounding conductors are connected together at the power panel. That is the only place they can be assumed to have the same potential. _____________________________________
/archives//html/Amps/2006-01/msg00214.html (8,160 bytes)

4. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 12:10:23 -0500
If there is actually no load of any kind connected to the neutral and that line is dedicated to that appliance (not shared with any other loads) then it is effectively an equipment grounding conducto
/archives//html/Amps/2006-01/msg00216.html (10,951 bytes)

5. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 18:39:27 -0500
I didn't say it is permitted. I said it is effectively a grounding conductor, because it carries no load current. For it to be permitted, it would have to be tied directly to the ground bus, not the
/archives//html/Amps/2006-01/msg00228.html (10,568 bytes)

6. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 18:44:13 -0500
(snip) (snip) The most common cause (I think) of lose connections is thermal cycles caused by load cycles. I see these often enough in industrial settings to be on the look out for them. Sometimes wi
/archives//html/Amps/2006-01/msg00229.html (9,148 bytes)

7. Re: [Amps] Plate choke and bypassing (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 18:58:17 -0500
Have you considered using a pair of ferrite cores made to suppress RFI through ribbon cables, used as an inductor core? (see part number 28R1861-000 at Digikey) I think you could get the required ind
/archives//html/Amps/2006-01/msg00230.html (8,752 bytes)

8. Re: [Amps] NEC-think. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 21:48:12 -0500
Oh, you are talking about unnecessary neutrals. Okay, you win. ;-) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a
/archives//html/Amps/2006-01/msg00234.html (9,875 bytes)

9. Re: [Amps] Plate choke and bypassing (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 06 Jan 2006 23:17:30 -0500
Sorry. I thought a plate choke was not operated at resonance, just as an inductive impedance between the plate signal and the DC supply. I agree that ferrite cores saturates with fewer ampere turns t
/archives//html/Amps/2006-01/msg00236.html (7,908 bytes)

10. Re: [Amps] Tapping a plate tank coil (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Sat, 07 Jan 2006 00:17:19 -0500
It is probably a bad idea. The turns in a spaced turn air cored inductor are only loosely coupled, so shorting out turns just detours flux around those turns. Since flux is fringing all over the plac
/archives//html/Amps/2006-01/msg00240.html (9,030 bytes)

11. Re: [Amps] choke ferrite rod (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Mon, 09 Jan 2006 12:02:10 -0500
I guy in Lithuania is selling .5 by 7.5 inch rods of unknown Russian ferrite on eBay (and also some smaller ones). I have some coming. Surplus Sales of Nebraska has a few: http://www.surplussales.com
/archives//html/Amps/2006-01/msg00276.html (8,030 bytes)

12. Re: [Amps] choke ferrite rod (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Mon, 09 Jan 2006 12:09:34 -0500
I forgot to mention one other available possibility. Digikey and other vendors sell pairs of flat ferrite rectangular blocks that are intended to be clam shelled around ribbon cable. If you add a spa
/archives//html/Amps/2006-01/msg00278.html (7,844 bytes)

13. Re: [Amps] Measuring tank Q (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Mon, 09 Jan 2006 17:48:29 -0500
Sounds pretty reasonable to me. One detail: You get a slightly more accurate center frequency by taking the square root of the product of the two -3db frequencies. This is the geometric mean, rather
/archives//html/Amps/2006-01/msg00305.html (7,529 bytes)

14. Re: [Amps] Meter Res. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Tue, 10 Jan 2006 17:57:48 -0500
What is the peak voltage you will drop across this resistor? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-01/msg00329.html (6,929 bytes)

15. Re: [Amps] Meter Res. (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Tue, 10 Jan 2006 21:50:54 -0500
Wow! 5 watts of heat and at least a 5000 volt continuous rating. I would go with 10 each 1 watt, 500k, 1% resistors, each rated for at least 1000 volts, to expect stable long term operation, since th
/archives//html/Amps/2006-01/msg00330.html (8,079 bytes)

16. Re: [Amps] LK-500 (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Tue, 17 Jan 2006 13:04:40 -0500
Newark used to carry the Sprague line, but they seem to be getting rid of them. These two might work, but check the dimensions: http://www.newark.com/NewarkWebCommerce/newark/en_US/endecaSearch/partD
/archives//html/Amps/2006-01/msg00428.html (8,027 bytes)

17. Re: [Amps] Ten Tec Herc 444 (original Herc) (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Thu, 19 Jan 2006 19:21:12 -0500
Can you point me toward a schematic of the regulator? This doesn't sound like a very difficult fix. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2006-01/msg00470.html (7,218 bytes)

18. Re: [Amps] OT : The word rookie (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Mon, 23 Jan 2006 20:22:24 -0500
Here is the most believable reference I found: http://dan.moneeek.com/content/ref/etymology/r6etym.htm To rook means to cheat. A rookie is someone easy to cheat or fool. _____________________________
/archives//html/Amps/2006-01/msg00561.html (7,838 bytes)

19. Re: [Amps] Copper / Brass strap? (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Tue, 24 Jan 2006 21:28:29 -0500
I wouldn't even consider brass, given its much higher resistance, and less malleability. You might go to McMaster Carr: http://www.mcmaster.com/ and enter [copper strip] in the search box. They have
/archives//html/Amps/2006-01/msg00598.html (7,510 bytes)

20. Re: [Amps] power supply for larger solid-state amps (score: 1)
Author: John Popelish <jpopelish@rica.net>
Date: Fri, 27 Jan 2006 22:23:54 -0500
(snip) (snip) Have you considered connecting the two 10 volt secondaries in series and using a pair of diodes to rectify the output, returning on the center tap? This cuts the diode heat and drop in
/archives//html/Amps/2006-01/msg00636.html (8,872 bytes)

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