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1. [Amps] Dummy Load Blues (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Thu, 14 Jun 2012 16:54:58 -0700 (PDT); Hello, To mess with amps, a good dummy load is a must. I went to my storage, and pulled out a Cantenna of unknown provenance that I had purchased about 30 years ago at a flea market. Not knowing what; /archives//html/Amps/2012-06/msg00113.html (8,778 bytes)
2. Re: [Amps] Dummy Load Blues (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 14 Jun 2012 18:54:43 -0400; Most came with non hazardous oil although many hams did put PCB oil in them. Did it smell like oil or mineral oil? If so it was not PCBs. Go to an industrial paint supply or even your Ace Hardware st; /archives//html/Amps/2012-06/msg00114.html (9,530 bytes)
3. Re: [Amps] Dummy Load Blues (score: 1): Author: <mike@n1ta.com>; Date: Thu, 14 Jun 2012 16:08:00 -0700; A few years ago I built something pretty similar to K4EAA's design, which can be found (with great pictures) at: http://www.k4eaa.com/dummy.html. Has worked FB for measuring low power stuff: mostly t; /archives//html/Amps/2012-06/msg00115.html (9,836 bytes)
4. Re: [Amps] Dummy Load Blues (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 14 Jun 2012 16:18:07 -0700; These make it easy: http://www.ebay.com/itm/4-ea-800-Watt-Hybrid-200-ohm-Load-Resistor-500-mHz-/370454666736?pt=LH_DefaultDomain_0&hash=item5640d19df0#ht_734wt_1396 <http://www.ebay.com/itm/4-ea-800-; /archives//html/Amps/2012-06/msg00116.html (11,698 bytes)
5. Re: [Amps] Dummy Load Blues (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Thu, 14 Jun 2012 18:45:57 -0500; Those are very expensive. Go look around on-line or at hamfests for carborundum resistors. Try to find four around 200 ohms each. If they are around 18 inches long or so and 1 inch diameter each will; /archives//html/Amps/2012-06/msg00117.html (8,646 bytes)
6. Re: [Amps] Dummy Load Blues (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Fri, 15 Jun 2012 08:00:34 +0800; I bought mine here. http://www.ebay.com.au/sch/rfandmicrowaves/m.html?_nkw=dummy+load&_sacat=0&_odkw=&_osacat=0&_trksid=p3911.c0.m270.l1313 73, Alek. VK6APK -- From sunny Binningup, Western Australia; /archives//html/Amps/2012-06/msg00118.html (13,677 bytes)
7. Re: [Amps] Dummy Load Blues (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Thu, 14 Jun 2012 17:03:06 -0700; Stop messing around with these lash-ups. You can buy a real Dummy Load, aka Bird, for short money. I got a 2500 Watt Bird for $200 over on the "evil empire" last year. With one like I got, you can re; /archives//html/Amps/2012-06/msg00119.html (10,454 bytes)
8. Re: [Amps] Dummy Load Blues (score: 1): Author: Bryan Swadener <bswadener@yahoo.com>; Date: Thu, 14 Jun 2012 17:25:49 -0700 (PDT); Hi Jerry, I wouldn't use mineral oil in a HP dummy load. The Cantenna has limited capacity. Using mineral oil will further reduce it. Actual transformer oil is as close as your power utility's transf; /archives//html/Amps/2012-06/msg00120.html (11,096 bytes)
9. Re: [Amps] Dummy Load Blues (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Thu, 14 Jun 2012 18:12:08 -0700; These are probably a better buy... http://www.ebay.com/itm/2-ea-800-Watt-Hybrid-100-ohm-Load-Resistor-to-500-mHz-/390429774095?pt=LH_DefaultDomain_0&hash=item5ae76d910f 73 Jim W7RY These make it easy; /archives//html/Amps/2012-06/msg00121.html (12,981 bytes)
10. Re: [Amps] Dummy Load Blues (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 15 Jun 2012 03:06:47 +0000; I built my very own Cantenna-like dummy load several years ago. The resistor is a carbon/ceramic tubular one with silvered ends, about 4cm diameter and 10cm long. It's 50 ohm, but I have no idea abou; /archives//html/Amps/2012-06/msg00123.html (9,413 bytes)
11. Re: [Amps] Dummy Load Blues (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 14 Jun 2012 20:49:16 -0700; True, but at only half the dissipation. :-) 73, Jim N7CXI _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-06/msg00125.html (14,049 bytes)
12. Re: [Amps] Dummy Load Blues (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 14 Jun 2012 22:08:32 -0600; Manfred, Just FYI. Using your numbers and assuming the SWR issues are excess inductance, the inductance necessary to turn 50 ohms to a 1.5:1 SWR on 2m is ~23nH. If you were to put 8pF from the center; /archives//html/Amps/2012-06/msg00128.html (10,647 bytes)
13. Re: [Amps] Dummy Load Blues (score: 1): Author: Gary Smith <wa6fgi@yahoo.com>; Date: Fri, 15 Jun 2012 08:57:52 -0700 (PDT); The method of keeping the oily goo off of the floor is identical as to how I have done it for many years. Same heathkit Cantenna too. 73, Gary...wa6fgi ______________________________________________; /archives//html/Amps/2012-06/msg00146.html (11,644 bytes)
14. Re: [Amps] Dummy Load Blues (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Fri, 15 Jun 2012 12:38:43 -0700 (PDT); = ** How would I know? Does PCB oil have a specific smell? Viscosity? Color? Actually, I would REALLY like to know, because I'd like to buy some transformer oil. There's a guy on Ebay who sells it re; /archives//html/Amps/2012-06/msg00153.html (8,769 bytes)
15. Re: [Amps] Dummy Load Blues (score: 1): Author: "Jeff DePolo" <jd0@broadsci.com>; Date: Fri, 15 Jun 2012 14:25:21 -0400; I usually go by taste. Seriously, the most-basic test is that PCB oils are heavier than water, while mineral oil is lighter than water. A couple of drops of of the subject oil in a cup of water woul; /archives//html/Amps/2012-06/msg00155.html (9,272 bytes)
16. Re: [Amps] Dummy Load Blues (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 15 Jun 2012 16:59:12 -0400; If it smells like oil it's normally oil. PCBs ... I've heard it described as a sharp or garlic smell. To me it was, just different than what oil or mineral oil smell like and I can't put a name to it; /archives//html/Amps/2012-06/msg00161.html (9,488 bytes)
17. Re: [Amps] Dummy Load Blues (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Fri, 15 Jun 2012 15:34:41 -0700 (PDT); It smelled kind of like paint thinner A.K.A. mineral spirits. It didn't burn. - Jerry _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2012-06/msg00162.html (10,491 bytes)
18. Re: [Amps] Dummy Load Blues (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 15 Jun 2012 21:12:32 +0000; Larry, I didn't even measure whether the raised SWR on VHF is due to series inductance, parallel capacitance, or whatever. When I made that PI circuit, I was in a hurry to test a 1kW rig I had repair; /archives//html/Amps/2012-06/msg00163.html (8,876 bytes)
19. Re: [Amps] Dummy Load Blues (score: 1): Author: "Jerry Kaidor" <jerry@tr2.com>; Date: Fri, 15 Jun 2012 15:55:38 -0700 (PDT); OK, I'm going to buy a gallon of transformer oil, and restore the Cantenna with a steel paint can. I will probably replace the top, and just drill the new one for the little box and the overpressure; /archives//html/Amps/2012-06/msg00165.html (9,377 bytes)
20. Re: [Amps] Dummy Load Blues (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Fri, 15 Jun 2012 15:55:46 -0700 (PDT); Before purchasing any transformer oil, go by your local electric company service center. The electric companies use transformer oil by the 55-gallon drum. Offer to buy a gallon. The vast majority; /archives//html/Amps/2012-06/msg00167.html (11,238 bytes)

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