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1. [Amps] Derating Dry Loads (score: 1): Author: "Mike & Becca Krzystyniak" <k9mk@flash.net>; Date: Mon, 6 Dec 2010 20:19:38 -0600; I have Bird 8173 Coaxial load rated at 300 watts continuous. I'm not that familiar with "dry RF loads" and I was wondering if these loads can be derated for brief periods of higher power like oil fil; /archives//html/Amps/2010-12/msg00046.html (7,237 bytes)
2. Re: [Amps] Derating Dry Loads (score: 1): Author: "Randall, Randy" <Randy.Randall@uchealth.com>; Date: Tue, 7 Dec 2010 10:25:04 -0500; I have used a 15 watt dry load @ 100 watts for 5 seconds without incident. It is the model that Radio Shack sold approx. 10 years ago. It was also sold under the Welz (sp) brand. In the specs it was; /archives//html/Amps/2010-12/msg00049.html (8,891 bytes)
3. Re: [Amps] Derating Dry Loads (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Tue, 7 Dec 2010 14:10:58 -0500; Be careful, sometimes the heat dissipation may not be the only factor. I can tell you that an internal arc at legal limit can do a lot of destruction. If the load takes it and runs away from 50 ohms; /archives//html/Amps/2010-12/msg00053.html (10,457 bytes)
4. Re: [Amps] Derating Dry Loads (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Tue, 07 Dec 2010 15:51:17 -0500; Nearly all dry loads (all that I know of) have a continuous ratings and then intermittent ratings at higher power. 73 Roger (K8RI) _______________________________________________ Amps mailing list Am; /archives//html/Amps/2010-12/msg00056.html (8,165 bytes)
5. Re: [Amps] Derating Dry Loads (score: 1): Author: "Randall, Randy" <Randy.Randall@uchealth.com>; Date: Tue, 7 Dec 2010 16:18:45 -0500; Possibly the best advice of all would be to call Bird. They would know. ;') Randy Randy E. Randall AB9GO Network Engineer UC Health Randy.Randall@UCHealth.com Phone 513-585-7146 Fax 513-585-7159 Near; /archives//html/Amps/2010-12/msg00057.html (10,061 bytes)
6. Re: [Amps] Derating Dry Loads (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 7 Dec 2010 16:40:39 -0500; The best way to determine the rating of a dry load resistor is to apply power and remove it about 30 seconds before the SWR goes up. Just like tightening head bolts on a V8. You torque the bolts unti; /archives//html/Amps/2010-12/msg00058.html (11,791 bytes)
7. [Amps] Derating dry loads (score: 1): Author: Donald Fox <taurusshoguy@yahoo.com>; Date: Tue, 7 Dec 2010 14:01:32 -0800 (PST); My experience has been that you can safely exceed a loads power rating by quite a bit for a short period of time. Kenwood used to make a small load called the RD-20. (I think) It was rated DC-500 mhz; /archives//html/Amps/2010-12/msg00059.html (7,427 bytes)
8. Re: [Amps] Derating Dry Loads (score: 1): Author: "Jim Dawson" <jdawson@jasystems.com>; Date: Tue, 7 Dec 2010 15:53:58 -0600; Well crap, that explains a lot, it is just "before" they snap! ... Just like tightening head bolts on a V8. You torque the bolts until just before you fill them give and they snap. 73 Bill wa4lav ___; /archives//html/Amps/2010-12/msg00060.html (7,921 bytes)
9. Re: [Amps] Derating Dry Loads (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Wed, 8 Dec 2010 00:25:15 -0500; For those that don't get it, a few did, once you feel the torque drop the bolt has already reached its limit and is broken. Once you see the SWR go up it is most likely too late. 73 Bill wa4lav Well; /archives//html/Amps/2010-12/msg00062.html (8,984 bytes)
10. Re: [Amps] Derating Dry Loads (score: 1): Author: "Mike & Becca Krzystyniak" <k9mk@flash.net>; Date: Wed, 8 Dec 2010 06:56:48 -0600; Thanks to all for your comments on this. One last question, where do I find one of these torque wrenches with a SWR meter in it? ;-) 73 Mike K9MK For those that don't get it, a few did, once you feel; /archives//html/Amps/2010-12/msg00063.html (9,868 bytes)
11. Re: [Amps] Derating Dry Loads (score: 1): Author: TexasRF@aol.com; Date: Wed, 8 Dec 2010 08:16:54 EST; Or, as in one of the suggestions: with an SWR anticipator meter showing vswr at T+30 seconds! 73, Gerald K5GW In a message dated 12/8/2010 6:57:10 A.M. Central Standard Time, k9mk@flash.net writes: T; /archives//html/Amps/2010-12/msg00064.html (8,402 bytes)
12. Re: [Amps] Derating Dry Loads (score: 1): Author: "Randall, Randy" <Randy.Randall@uchealth.com>; Date: Wed, 8 Dec 2010 09:24:17 -0500; I remember Ford having a torque spec on their aluminum head engines in the 80's that read " Tighten the head bolt to XX ft lbs, then turn the bolt an additional 1/4 turn." Randy Randy E. Randall AB9G; /archives//html/Amps/2010-12/msg00065.html (10,788 bytes)

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