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1. [Amps] 160M PI network Toroidal Coil (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 04 Oct 2013 19:47:46 -0700; I'm going to convert a SB221 to a single band 160M amp. It seems most of the amps these days use a toroidal coil for the 160M Output PI network. Does anybody know what cores are typically used for th; /archives//html/Amps/2013-10/msg00028.html (6,609 bytes)
2. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 5 Oct 2013 11:10:59 -0400; Micrometals 2 mix, usually a stack of 2 T200-2's wrapped with Scotch 27 tape, then Teflon insulated #14 stranded or solid. However starting from scratch will require about twice the inductance of jus; /archives//html/Amps/2013-10/msg00041.html (9,112 bytes)
3. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: TexasRF@aol.com; Date: Sat, 5 Oct 2013 11:25:07 -0400 (EDT); Paul, once the old plate inductors are removed, is there not enough room for a single 160m inductor? I suspect the toroids are used for 160m primarily to save some space in a typically crowded plate; /archives//html/Amps/2013-10/msg00043.html (8,394 bytes)
4. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 05 Oct 2013 15:25:26 +0000; Paul, I'm going to convert a SB221 to a single band 160M amp. It seems most of the amps these days use a toroidal coil for the 160M Output PI network. Does anybody know what cores are typically used; /archives//html/Amps/2013-10/msg00044.html (8,059 bytes)
5. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Jim W7RY <w7ry@centurytel.net>; Date: Sat, 05 Oct 2013 08:27:05 -0700; Paul See the 3CX1500D7 amplifier project in the later versions of the ARRL handbook by Jerry K8RA. He uses a toroidal coil for both 80 and 160 meters. That may give you some ideas too. 73 Jim W7RY Us; /archives//html/Amps/2013-10/msg00045.html (9,833 bytes)
6. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Louis Parascondola <gudguyham@aol.com>; Date: Sat, 5 Oct 2013 11:28:13 -0400 (EDT); Why not use a close wound wire coil. There is plenty of room. Built a mono 160m Clipperton L using a wire coil. Amp works great and there is less room in there than the 220. Performance is great. 100; /archives//html/Amps/2013-10/msg00046.html (9,602 bytes)
7. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 05 Oct 2013 09:23:00 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: If you use either #4 or #6 solid bare copper wire it will be basically self-supporting without the need of a core. Mount it with a ceramic standoff at each e; /archives//html/Amps/2013-10/msg00051.html (8,731 bytes)
8. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Sat, 5 Oct 2013 13:10:21 -0500; When I converted my SB-200 to a single-band 160m amp, I followed the directions (more or less) at http://pa0fri.home.xs4all.nl/Lineairs/SB200/sb200eng.htm#DESIGN . The toroid was a single T-200-2 cor; /archives//html/Amps/2013-10/msg00055.html (8,919 bytes)
9. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 05 Oct 2013 11:44:02 -0700; Thanks to every one on their suggestions. It seems that multiple T200-2 cores are the most common. - Paul _______________________________________________ Amps mailing list Amps@contesting.com http://; /archives//html/Amps/2013-10/msg00056.html (7,875 bytes)
10. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Bryan Swadener <bswadener@yahoo.com>; Date: Sat, 5 Oct 2013 15:41:09 -0700 (PDT); I might as well add my input... My GS35b 160m monobander will use about 15uH fixed and 16uH adjustable, to drive ~ 25 to 500 ohms. The fixed inductor is 20T 10 AWG 19-strand silverplated copper wir; /archives//html/Amps/2013-10/msg00058.html (10,309 bytes)
11. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 5 Oct 2013 19:38:58 -0400; A sustained arc in a small glass fuse improperly used at 10 times or more its rating is far from a rare occurance. It gets downright dangerous when the glass breaks and the small arc becomes a monste; /archives//html/Amps/2013-10/msg00060.html (11,242 bytes)
12. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 06 Oct 2013 00:25:36 +0000; Bill, Wind it on a piece of 3 inch diameter pipe under as much tension as you can and you will have a strong, stiff coil with plenty of current carrying capacity. It will have essentially zero loss a; /archives//html/Amps/2013-10/msg00061.html (10,856 bytes)
13. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Bill Turner <dezrat1242@yahoo.com>; Date: Sat, 05 Oct 2013 20:43:56 -0700; ORIGINAL MESSAGE: (may be snipped) REPLY: I stand by what I said. I have such a coil in my homebrew 8877 amp using #4 wire and it runs barely warm with the key down. I call that "essentially zero" in; /archives//html/Amps/2013-10/msg00065.html (8,942 bytes)
14. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Sun, 6 Oct 2013 14:02:59 +0200; Is that a 160m mono band amp with a loaded Q of 12 in the tank circuit or is your 160m toroid coil just delivering one halve or less of the total inductance on 160m? 73 Peter ORIGINAL MESSAGE: (may b; /archives//html/Amps/2013-10/msg00068.html (9,907 bytes)
15. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: George <at6c@bellsouth.net>; Date: Sun, 06 Oct 2013 07:49:52 -0500; Hi Carl, What size wire would you recommend for a 1A supply? If there is a choice of where to insert the wire would you use it in the RF compartment or near the B+ supply? Would you recommend a glitc; /archives//html/Amps/2013-10/msg00069.html (12,620 bytes)
16. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 06 Oct 2013 09:01:49 -0400; On 10/6/2013 8:49 AM, George wrote: Hi Carl, What size wire would you recommend for a 1A supply? If there is a choice of where to insert the wire would you use it in the RF compartment or near the B+; /archives//html/Amps/2013-10/msg00070.html (10,295 bytes)
17. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 6 Oct 2013 09:28:36 -0400; ORIGINAL MESSAGE: (may be snipped) You are wrong regarding the loss. The loss isn't "essentially zero", unfortunately. Such a coil will likely end up having a Q between 300 and 350, perhaps lower if; /archives//html/Amps/2013-10/msg00071.html (10,344 bytes)
18. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 6 Oct 2013 09:28:52 -0400; I recommend a real HV fuse or a homebrew version. I DID NOT suggest using a bare wire. A glitch resistor is always a good idea and it should be mounted close to the base of the plate choke and bypass; /archives//html/Amps/2013-10/msg00072.html (13,582 bytes)
19. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: Jim W7RY <w7ry@centurytel.net>; Date: Sun, 06 Oct 2013 15:53:51 -0700; There is little to no RTTY activity on 160 meters. 73 Jim W7RY ORIGINAL MESSAGE: (may be snipped) You are wrong regarding the loss. The loss isn't "essentially zero", unfortunately. Such a coil will; /archives//html/Amps/2013-10/msg00080.html (10,670 bytes)
20. Re: [Amps] 160M PI network Toroidal Coil (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 6 Oct 2013 19:44:38 -0400; Maybe in your part of the world but there is often some RTTY or digital bozo warbling away in the CW "DX Window" until he gets chased off. Then there is the CQ QRP weenie right on top of a DX station; /archives//html/Amps/2013-10/msg00081.html (11,734 bytes)

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