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1. [Amps] Source for plate xfrmer (score: 1): Author: "Steve Bookout" <steve@dx4win.com>; Date: Mon, 13 Feb 2012 13:35:38 -0500 (EST); Hello all, Where do you look for a new HV plate transformer these days? I understand Peter Dahl is no longer around. I'm looking for 3000 VAC secondary @ 1+ amp CCS. TIA 73 de Steve, NR4M ___________; /archives//html/Amps/2012-02/msg00126.html (6,891 bytes)
2. Re: [Amps] Source for plate xfrmer (score: 1): Author: Al Kozakiewicz <akozak@hourglass.com>; Date: Mon, 13 Feb 2012 13:38:57 -0500; Unless something changed, Harbach Electronics now makes/sells the Dahl transformers. Al AB2ZY Hello all, Where do you look for a new HV plate transformer these days? I understand Peter Dahl is no lon; /archives//html/Amps/2012-02/msg00127.html (7,593 bytes)
3. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 13 Feb 2012 18:55:58 -0500; And you pay thru the nose. Id check with Heyboer Transformer if you Dont have to have a C-Core. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2012-02/msg00129.html (8,744 bytes)
4. Re: [Amps] Source for plate xfrmer (score: 1): Author: "B Osburn" <plantrunner5@msn.com>; Date: Mon, 13 Feb 2012 19:52:12 -0700; I don't think this is what you are looking for but Monster Controls has used control power XFMRs. I paid $950 for a 5kVA 240/2400V + Shipping. They only come in common medium voltage (MV) switchgear; /archives//html/Amps/2012-02/msg00136.html (11,710 bytes)
5. Re: [Amps] Source for plate xfrmer (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 13 Feb 2012 21:10:48 -0600; In addition EPD makes a good product but plan on spending at least $400, perhaps more. http://epd-inc.com/ How much are you prepared to spend? Because of the price of copper any custom plate iron you; /archives//html/Amps/2012-02/msg00137.html (8,521 bytes)
6. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 13 Feb 2012 22:13:12 -0500; Are those suitable for ham amp use or do they have old style high impedance (and DC resistance) windings that are not that suitable for a big C only filter? IE: Pole Pigs Carl KM1H I don't think this; /archives//html/Amps/2012-02/msg00139.html (10,922 bytes)
7. Re: [Amps] Source for plate xfrmer (score: 1): Author: Steve Bookout <steve@dx4win.com>; Date: Mon, 13 Feb 2012 23:05:53 -0500; Guys, This is where I think i got into trouble. I rebuilt a BTI 2000 that had already had another PS put in place of the original. The resultant load impedance was so far from the original design tha; /archives//html/Amps/2012-02/msg00141.html (14,254 bytes)
8. Re: [Amps] Source for plate xfrmer (score: 1): Author: "B Osburn" <plantrunner5@msn.com>; Date: Mon, 13 Feb 2012 21:10:26 -0700; No, they are regular EI cores. Plain transformers used to supply control power for relays, etc. on MV busses. Not high Z. My HV wdg measures(DC) 6.8 ohms, LV 0.1 ohms with a Fluke 87. Here is my name; /archives//html/Amps/2012-02/msg00143.html (14,567 bytes)
9. Re: [Amps] Source for plate xfrmer (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 14 Feb 2012 07:49:36 +0000; I'm glad the Pi-net calculator worked for you. As for the &%Ą#?@ transformer, have tried checking it out with M0KGK's 'PSU Designer' software? Follow the link (below) and you can also download some H; /archives//html/Amps/2012-02/msg00144.html (10,350 bytes)
10. Re: [Amps] Source for plate xfrmer (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 14 Feb 2012 05:17:05 -0600; In your long description you said nothing about the filter caps in use. Please describe them. Ideally I would want one or more oil caps giving around 50 uF with 6 KVWDC 73 Rob K5UJ __________________; /archives//html/Amps/2012-02/msg00145.html (8,754 bytes)
11. Re: [Amps] Source for plate xfrmer (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 14 Feb 2012 11:38:08 +0000; Good regulation requires two things: low transformer winding resistances *and* sufficient capacitance. If the winding resistances are much too high (which seems to be the case with Steve's transforme; /archives//html/Amps/2012-02/msg00146.html (9,009 bytes)
12. Re: [Amps] Source for plate xfrmer (score: 1): Author: TexasRF@aol.com; Date: Tue, 14 Feb 2012 08:33:26 -0500 (EST); Hi Ian, a third requirement for good regulation is a stiff ac power service. In rural areas this can be a bit of a problem with C filter designs. Can also be a problem in older homes with less than r; /archives//html/Amps/2012-02/msg00147.html (9,344 bytes)
13. Re: [Amps] Source for plate xfrmer (score: 1): Author: "DAVE WHITE" <mausoptik@btinternet.com>; Date: Tue, 14 Feb 2012 05:55:08 -0800; Yes, that's a bit of a problem for me here. I also remember visiting another amateur (who shall remain nameless) in south Wales and watched as he demonstrated how he could modulate the street light i; /archives//html/Amps/2012-02/msg00148.html (11,053 bytes)
14. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 14 Feb 2012 09:37:54 -0500; Thanks Brad, thats all new news to me and something to watch out for at area surplus shops. Carl KM1H No, they are regular EI cores. Plain transformers used to supply control power for relays, etc. o; /archives//html/Amps/2012-02/msg00149.html (13,672 bytes)
15. Re: [Amps] Source for plate xfrmer (score: 1): Author: Steve Bookout <steve@dx4win.com>; Date: Tue, 14 Feb 2012 09:38:45 -0500; Hello Rob, They are the snap-in type of electrolytic caps. I'm in the house right now, so don't have that info at my fingertips. Will let you know later. Using ten. something like 330 mf @ 450v. 105C; /archives//html/Amps/2012-02/msg00150.html (10,555 bytes)
16. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 14 Feb 2012 10:04:06 -0500; This is where a choke input comes in handy. About 12H (a fairly common surplus item) followed by about 20-30uF should give a stiff output at around 90%+ of RMS. Use a HV probe to check for diode spik; /archives//html/Amps/2012-02/msg00152.html (11,058 bytes)
17. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 14 Feb 2012 10:41:02 -0500; You can get more benefit with primary taps and not bothering with a pair of 120V windings; use a seperate 120V line for blowers, LV supplies, etc. Tapping the secondary limits your KVA as you go to l; /archives//html/Amps/2012-02/msg00153.html (10,944 bytes)
18. Re: [Amps] Source for plate xfrmer (score: 1): Author: TexasRF@aol.com; Date: Tue, 14 Feb 2012 10:54:42 -0500 (EST); I guess there is some electrical code that forbids connecting the 120vac blower between one side of the 240ac line and neutral? I hope this doesn't start another round of ground vs neutral wiring sin; /archives//html/Amps/2012-02/msg00154.html (10,771 bytes)
19. Re: [Amps] Source for plate xfrmer (score: 1): Author: "Steve Bookout" <steve@dx4win.com>; Date: Tue, 14 Feb 2012 11:00:30 -0500 (EST); Hello again, Rob, Caps are Nippon Chemicon KMH series 470 mf @ 450v About 1 1/2 inch dia by 2 inch height. Actually, there were 12 of them, not 10 like I said before. Steve, NR4M ____________________; /archives//html/Amps/2012-02/msg00155.html (9,315 bytes)
20. Re: [Amps] Source for plate xfrmer (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 14 Feb 2012 10:38:57 -0600; Steve: It looks like you are in pretty good shape with the caps. Gerald: You typically have two hots and ground no neutral return. You connect a 120 v. fan across one hot and CT on the plate iron pri; /archives//html/Amps/2012-02/msg00156.html (10,953 bytes)

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