- 1. [Amps] Ferrite Rod (score: 1)
- Author: Ed Stallman <n5blz@peoplepc.com>
- Date: Tue, 02 Jan 2007 08:28:32 -0600
- Who has or sells Ferrite Rod? I'm looking for 3/8 OD , not sure how long to wind a Filament choke! Thanks Ed N5BLZ _______________________________________________ Amps mailing list Amps@contesting.co
- /archives//html/Amps/2007-01/msg00022.html (6,081 bytes)
- 2. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Harold Mandel" <ka1xo@juno.com>
- Date: Tue, 2 Jan 2007 10:20:52 -0500
- Dear Ed, and the Club, Mr. Gintaras Sakenas, LY2KW, (a/k/a "KWTUBES") has a fine stock of ferrite rods for such projects. I have dealt with Mr. Sakenas on several occasions and can attest to his wort
- /archives//html/Amps/2007-01/msg00023.html (7,815 bytes)
- 3. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Tue, 2 Jan 2007 09:32:02 -0600
- I used the .5 X 4 rods material type 33 with #10 enamel wire wound to the ends in a 3cx3000a7 amp and it works on 3.75 MHz just fine. It sits in from of a fan in the lower deck compartment. At 51.5 a
- /archives//html/Amps/2007-01/msg00024.html (7,884 bytes)
- 4. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 06:45:43 -0600
- Jim, I believe you'll be safe running paralleled 30 amp chokes in front of the 800 CFM. If you don't have the chokes already wound you might wind single windings on each ferrite rod leaving just a ve
- /archives//html/Amps/2007-01/msg00038.html (9,895 bytes)
- 5. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 07:11:33 -0600
- Jim, Forgot to mention this but you might consider floating the filament transformer. I've never tried the approach myself but have heard others that have had good results with it. It's pretty easy t
- /archives//html/Amps/2007-01/msg00039.html (10,370 bytes)
- 6. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Wed, 3 Jan 2007 08:14:52 -0500
- Parallel bifilar wound chokes are fine, as long as each winding goes to an opposing filament terminal. Of course you would effectively lose half of the choke impedance with two chokes in parallel, a
- /archives//html/Amps/2007-01/msg00040.html (8,478 bytes)
- 7. Re: [Amps] Ferrite Rod (score: 1)
- Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
- Date: Wed, 3 Jan 2007 14:36:20 +0100 (CET)
- reason being nothing cancels magnetizing flux caused by the many ampere turns of the single winding and the core often saturates. The result is at best a loss of RF choke impedance at the filament, a
- /archives//html/Amps/2007-01/msg00041.html (9,523 bytes)
- 8. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 07:52:49 -0600
- Peter, Henry made filament chokes using copper tubing and what looked to be the center insulation and conductor from RG8U slid into the center of the tubing. This tubing was then formed into a coil o
- /archives//html/Amps/2007-01/msg00042.html (8,963 bytes)
- 9. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 08:06:31 -0600
- Tom, Thanks for pointing that out. I wasn't thinking about the canceling effects of bifilar wound and the need to do so especially under high currents. Larry N5BIP reason being nothing cancels magnet
- /archives//html/Amps/2007-01/msg00043.html (8,308 bytes)
- 10. Re: [Amps] Ferrite Rod (score: 1)
- Author: "k7rdx" <k7rdx@charter.net>
- Date: Wed, 3 Jan 2007 06:11:06 -0800
- Larry,my initial thought was to urethane clear coat .125 in. copper tubing and wind enough turns around paralled ferrite rods to get what I need...I planned to isolate the filament trans anyway,so ad
- /archives//html/Amps/2007-01/msg00044.html (12,175 bytes)
- 11. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Wed, 3 Jan 2007 09:35:29 -0500
- Hi Jim, I would not use copper tubing. Copper tubing is great at Radio Frequencies where skin depth is shallow, but not for high current lower frequency stuff. Current rating at low frequencies is re
- /archives//html/Amps/2007-01/msg00045.html (9,220 bytes)
- 12. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 08:55:46 -0600
- Maybe a combination of air wound choke on secondary and a floating filament transformer would suffice. Use enough choke between tube & filament transformer secondary to server for maybe 14 MHz to 30
- /archives//html/Amps/2007-01/msg00046.html (8,174 bytes)
- 13. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Wed, 3 Jan 2007 19:03:45 -0500
- Hi Larry, The reactance of the filament choke is in series with the stray capacitance of the transformer to ground. Let's say you have 250 ohms inductive reactance from the choke on 14 MHz, and 250
- /archives//html/Amps/2007-01/msg00048.html (9,785 bytes)
- 14. Re: [Amps] Ferrite Rod (score: 1)
- Author: "Larry Carman" <lncarman@swbell.net>
- Date: Wed, 3 Jan 2007 19:04:53 -0600
- Thanks Tom. Very valuable info. Nice to have someone around who understands these things at a much higher level. Regards, Larry N5BIP Hi Larry, The reactance of the filament choke is in series with t
- /archives//html/Amps/2007-01/msg00049.html (10,140 bytes)
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