Re: [Elecraft] Lightning damage
YES Now lets dump the spell check Russ Sent from my T-Mobile 4G LTE Device Original message From: K9MA <k...@sdellington.us> Date: 11/7/17 7:46 PM (GMT-05:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Lightning damage Not lightening, LIGHTNING! -- Scott K9MA k...@sdellington.us __ Elecraft mailing list Home: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft=02%7C01%7Cmundschenk55%40msn.com%7C1e56235d65734abd2e2508d52642149a%7C84df9e7fe9f640afb435%7C1%7C0%7C636456987617788446=GJ5mi%2BZUGD5zrpZ35Ellsq4jOIoQWc2JVk1avNwegrY%3D=0 Help: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm=02%7C01%7Cmundschenk55%40msn.com%7C1e56235d65734abd2e2508d52642149a%7C84df9e7fe9f640afb435%7C1%7C0%7C636456987617788446=XPIkIdQzkbAOWusgOy0IxAQvn9Y9i94C7dpd2lbxbXU%3D=0 Post: mailto:Elecraft@mailman.qth.net This list hosted by: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net=02%7C01%7Cmundschenk55%40msn.com%7C1e56235d65734abd2e2508d52642149a%7C84df9e7fe9f640afb435%7C1%7C0%7C636456987617788446=eNmNEhV9VT8jbynlJdlGvTur%2BwHM1yb%2BzWpf812BUu4%3D=0 Please help support this email list: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html=02%7C01%7Cmundschenk55%40msn.com%7C1e56235d65734abd2e2508d52642149a%7C84df9e7fe9f640afb435%7C1%7C0%7C636456987617788446=fnFtk9qkVVRZkGVG3IF4yOzU9MZTJkqZe3V1G3xXLPE%3D=0 Message delivered to mundschen...@msn.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Lightning damage
Not lightening, LIGHTNING! -- Scott K9MA k...@sdellington.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Lightning damage
I have several series mode surge protectors. They are big, heavy and more expensive but have none of the limitations of MOV sacrificial shunt devices. I would get rid of any older MOV-based surge protection devices that are lying around. They have been known to burn. The newer ones are supposed to have thermal protection but I wouldn't trust offshore manufacturers to implement it correctly; or not skip it entirely like they do filter components in switching power supplies... All those plastic power strips that are laying around-- if any have MOV devices I'd trash them. A sacrificial shunt device in a "stylish" plastic container? No thanks. 73, Drew AF2Z On 11/06/17 22:18, djl wrote: I know personally (not FOF) of one death due to a hanging RF cable, in this case a cb antenna. Don't just leave the lead to your antenna hanging. I use very inexpensive switches from epay that have a grounded off. MOV devices only absorb a finite, unpredictable, number of hits. In other words, the next hit may be the device's failure. There are other devices that are better. As with ground fault outlets, you only need one good protective device per AC circuit. In fact, on the ordinary household service, one industrial strength device on each side of the 220 service at the breaker box is needed. Look up "whole house surge suppressor" online. Some of the "best" have mov's. I have not looked lately at availability of non-mov units, which I could recommend. Multiple outlet strips with surge protection have in general mov's that are too samll. I personally don't trust them. ARRL has a very good guide to grounding and protection. 73 and happy grounding __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Lightning damage here
Don, Really sorry to hear that. I empathize. We lost two major appliances late June when the Derecho hit Virginia with 75 mph winds and a lightning show like I haven't seen in many years. That lightning hit was not direct, but we heard the snap in the house. It came through a wall receptacle in the family room and literally blew a hole in the hardwood floor. Luckily, all my radio and computer equipment was spared, I think, due to my running around the house, as the storm approached, and unplugging everything I could and having greatly improved my grounding system based upon many a good discussion here on this reflector. We got hit, again last night and my vertical took a hit (I saw it), it blew out the gas discharge protectors I had in-line and the 2 inch grounding strap at outside copper bus plate is black and melted. But, I also had solid 2 AWG going from that plate to ground ( 8 rods, one every four feet). I wish you the very best. 73, Greg K2UM __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Lightning damage here
On Thu, Aug 9, 2012 at 8:15 PM, Don Wilhelm w3...@embarqmail.com wrote: a nearby lightning strike last evening That is a bummer, Don. Lightning can make its way throughout the house by various evil means. A few years ago a strike hit a tree across the street, traveled across the crown of nearby trees to our roof, thence into the house wiring and fried a TV set, the lawn-sprinkler system, the microwave, the sound card in my son's laptop, the display on my FT-1000MP, and my 2M/440 base-station radio. If it wants to get you, it will. Good luck getting things back to normal. Tony KT0NY -- http://www.isb.edu/faculty/facultydir.aspx?ddlFaculty=352 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
RE: [Elecraft] Lightning damage result/repair
Ron, Proof positive that lightning can and will do 'strange stuff' one never knows about its behavior. It is always a good thing to exercize caution when the sky 'rumbles'. I just repaired a K2 (no KPA100) for a fellow that was not connected to an antenna or powered on when lightning hit nearby and it zapped a PC Board trace at the DC entry and opened the reverse polarity protective diodes and zapped his internal battery pack with no other damage apparent. There is always a chance that other devices were damaged and may fail later, but short of replacing all the active devices in the K2, there are tradeoffs to be made considering the cost and trouble vs. the potential for failure later. It may be wise to say If it ain't broke, don't fix it! 73, Don W3FPR -Original Message- Hi Yesterday a thunderstorm ran through here, and while I didn't think it was anywhere too close, the SWR bridge diodes in the KPA100 thought otherwise. A few hours after the storm, I fired the K2/100 up and it was receiving fine, but my troubles started when I tried to tune up. I don't recall all the events, but I do know I was quite surprised when the K2 started to tune and suddenly all the lights went out. A quick check of the fuse in the power cord showed the 20amp fuse had blown. Replacing the fuse bought the set to life again, but when I tried to transmit, the display showed unusual readings and it was obvious there was no power going up the spout. Immediate panic set in as I visualized sending to Elecraft for a pair of new finals. However, after taking the shield off the PA and poking around with the DMM, I quickly found the FWD diode in the SWR circuit open circuit and the REV diode gave a reading of 2.2ohms both ways round. The final out come resulted in a repair that cost me two 98c diodes and a couple of hours work, as Elecraft cunningly put the SWR bridge diodes in probably the most awkward place they could think of in the KPA100. Everything works fine again now, but I have to wonder what else may have been damaged and just waiting for the likes of Field Day to stop working? Another mystery to me is why didn't the diodes in the bridge circuit of the KAT100 go as well?? And what made the 20 amp fuse blow? (perhaps the power being ramped up too high as the diodes were in their death throws?) Cheers...Ron ZL1TW ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
