From n1rj at roadrunner.com Thu Nov 3 15:12:46 2011 From: n1rj at roadrunner.com (Roger D Johnson) Date: Thu, 03 Nov 2011 14:12:46 -0500 Subject: [Hi-zreceivingarraydiscussions] Plus 6 preamps In-Reply-To: References: Message-ID: <4EB2E7AE.5000004@roadrunner.com> Did you forget about me? Roger From contact at hizantennas.com Thu Nov 3 15:25:37 2011 From: contact at hizantennas.com (contact) Date: Thu, 3 Nov 2011 12:25:37 -0700 Subject: [Hi-zreceivingarraydiscussions] Plus 6 preamps In-Reply-To: <4EB2E7AE.5000004@roadrunner.com> References: <4EB2E7AE.5000004@roadrunner.com> Message-ID: <011801cc9a5e$5e6f2f50$1b4d8df0$@com> Hi Roger, NO. The PLUS6s are wildly popular and we are building them as fast as possible. Your specific order is in final calibration and will either ship today or tomorrow. All the field reports in regards to the PLUS6 are all very favorable, including better SNR. Anything I can do, please let me know. Cheers / 73 Gunny (aka Dick) -----Original Message----- From: hi-zreceivingarraydiscussions-bounces at hizantennas.com [mailto:hi-zreceivingarraydiscussions-bounces at hizantennas.com] On Behalf Of Roger D Johnson Sent: Thursday, November 03, 2011 12:13 PM To: Hi-Z Receiving Array Discussions Subject: [Hi-zreceivingarraydiscussions] Plus 6 preamps Did you forget about me? Roger _______________________________________________ Hi-zreceivingarraydiscussions mailing list Hi-zreceivingarraydiscussions at hizantennas.com http://mail.hizantennas.com/mailman/listinfo/hi-zreceivingarraydiscussions_h izantennas.com From w9ixx at arrl.net Sun Nov 6 10:46:09 2011 From: w9ixx at arrl.net (Phil W9IXX) Date: Sun, 06 Nov 2011 10:46:09 -0500 Subject: [Hi-zreceivingarraydiscussions] lightning protection In-Reply-To: References: Message-ID: <4EB6ABC1.8080309@arrl.net> Hi, Will appreciate any information you can pass along on these changes to help correcting these problems on my setup here in NC. (4sq setup at NW, NE, SE, & SW) I am considering another 4sq setup for shifting in relation to the original by 45deg. Thanks again for the products and your concern in providing the best possible equipment. 73 Phil W9IXX On 10/22/2011 01:24, Lee K7TJR wrote: > I believe we may have improved our systems ability to handle the energy from close lightning strikes. I know there are rumors out there and they are somewhat true. We have found 3 separate issues. One is that our transient diodes on the CTRL switching lines were being destroyed by induced currents. We have increased the size of those didoes and installed MOV devices across each one. So far knock on wood we have not seen any more damage to the diodes. The second item is if the system is powered and the relays in the HI-Z amps are open the FET devices and there clamping diodes can be damaged from static discharge. The only way to prevent this is to turn power off to the array during threatening storms. This has been a minimal problem. Yes, it is true we have lost a few FETs but what we have found is a third item where the Hi-Z amps were being destroyed by an induced transient on the 75 ohm output RG-6 line from the amp. We have designed some protection for this and so far w! > e have been successful with no further damaged FETs directly attributable to this problem. We have modified all production to include these mods and have been installing them in any units that come in for service. One unfortunate individual that must live in the lightning capital of the world endured amp damage 3 times in as many weeks. Now after the mods we have heard of no more damage. Whew! > Any one needing more information can contact us directly as we are trying to document the mod procedure now so anyone experiencing probles can take advantage of the changes. This problem from our perspective has been a very small percentage of the units in the field. Contact us if you would like us to mod the units here. We are trying to figure out an equitable way to acoomplish this at a minimum cost to both parties. Again, not everyone will need these mods. We hope to get an application note up on the web soon with the change information also. > Thanks to every one for the tremendous support. You never know what we might come up with next! > Lee K7TJR > _______________________________________________ > Hi-zreceivingarraydiscussions mailing list > Hi-zreceivingarraydiscussions at hizantennas.com > http://mail.hizantennas.com/mailman/listinfo/hi-zreceivingarraydiscussions_hizantennas.com > From contact at hizantennas.com Sun Nov 6 14:26:49 2011 From: contact at hizantennas.com (contact) Date: Sun, 6 Nov 2011 11:26:49 -0800 Subject: [Hi-zreceivingarraydiscussions] lightning protection In-Reply-To: <4EB6ABC1.8080309@arrl.net> References: <4EB6ABC1.8080309@arrl.net> Message-ID: <01ae01cc9cba$0974a030$1c5de090$@com> Hi Phil, Please look at the Hi-Z 4-8PRO http://www.hizantennas.com/4_8_pro_8_element_array.htm It is 2 each 4 element arrays interleafed. This makes an 8 circle array, with 8 directions every 45 degrees. Any questions glad to take them off line. 73 Dick KO7N -----Original Message----- From: hi-zreceivingarraydiscussions-bounces at hizantennas.com [mailto:hi-zreceivingarraydiscussions-bounces at hizantennas.com] On Behalf Of Phil W9IXX Sent: Sunday, November 06, 2011 7:46 AM To: Hi-Z Receiving Array Discussions; Phil Subject: Re: [Hi-zreceivingarraydiscussions] lightning protection Hi, Will appreciate any information you can pass along on these changes to help correcting these problems on my setup here in NC. (4sq setup at NW, NE, SE, & SW) I am considering another 4sq setup for shifting in relation to the original by 45deg. Thanks again for the products and your concern in providing the best possible equipment. 73 Phil W9IXX On 10/22/2011 01:24, Lee K7TJR wrote: > I believe we may have improved our systems ability to handle the energy from close lightning strikes. I know there are rumors out there and they are somewhat true. We have found 3 separate issues. One is that our transient diodes on the CTRL switching lines were being destroyed by induced currents. We have increased the size of those didoes and installed MOV devices across each one. So far knock on wood we have not seen any more damage to the diodes. The second item is if the system is powered and the relays in the HI-Z amps are open the FET devices and there clamping diodes can be damaged from static discharge. The only way to prevent this is to turn power off to the array during threatening storms. This has been a minimal problem. Yes, it is true we have lost a few FETs but what we have found is a third item where the Hi-Z amps were being destroyed by an induced transient on the 75 ohm output RG-6 line from the amp. We have designed some protection for this and so far w! > e have been successful with no further damaged FETs directly attributable to this problem. We have modified all production to include these mods and have been installing them in any units that come in for service. One unfortunate individual that must live in the lightning capital of the world endured amp damage 3 times in as many weeks. Now after the mods we have heard of no more damage. Whew! > Any one needing more information can contact us directly as we are trying to document the mod procedure now so anyone experiencing probles can take advantage of the changes. This problem from our perspective has been a very small percentage of the units in the field. Contact us if you would like us to mod the units here. We are trying to figure out an equitable way to acoomplish this at a minimum cost to both parties. Again, not everyone will need these mods. We hope to get an application note up on the web soon with the change information also. > Thanks to every one for the tremendous support. You never know what we might come up with next! > Lee K7TJR > _______________________________________________ > Hi-zreceivingarraydiscussions mailing list > Hi-zreceivingarraydiscussions at hizantennas.com > http://mail.hizantennas.com/mailman/listinfo/hi-zreceivingarraydiscussions_h izantennas.com > _______________________________________________ Hi-zreceivingarraydiscussions mailing list Hi-zreceivingarraydiscussions at hizantennas.com http://mail.hizantennas.com/mailman/listinfo/hi-zreceivingarraydiscussions_h izantennas.com From yc0low at gmail.com Sun Nov 6 17:18:08 2011 From: yc0low at gmail.com (Jo, YC0LOW) Date: Mon, 7 Nov 2011 05:18:08 +0700 Subject: [Hi-zreceivingarraydiscussions] lightning protection In-Reply-To: References: Message-ID: Lee and Dick, I look forward to seeing the document's mod on your web. The new 2 elements rx array was working good for me while at /1 qth - a day after CQWW SSB 2011 contest. The /1 qth is also known as the 'lightning capital" :-)) and we're shortly come to raining season (pse see Locator: *OI33TG94DX* Latitude: 6?43.76' S - Longitude: 107?39.57' E) Tnx es 73 de Jo, YC0LOW On Sat, Oct 22, 2011 at 12:24 PM, Lee K7TJR wrote: > I believe we may have improved our systems ability to handle the energy > from close lightning strikes. I know there are rumors out there and they > are somewhat true. We have found 3 separate issues. One is that our > transient diodes on the CTRL switching lines were being destroyed by > induced currents. We have increased the size of those didoes and installed > MOV devices across each one. So far knock on wood we have not seen any more > damage to the diodes. The second item is if the system is powered and the > relays in the HI-Z amps are open the FET devices and there clamping diodes > can be damaged from static discharge. The only way to prevent this is to > turn power off to the array during threatening storms. This has been a > minimal problem. Yes, it is true we have lost a few FETs but what we have > found is a third item where the Hi-Z amps were being destroyed by an > induced transient on the 75 ohm output RG-6 line from the amp. We have > designed some protection for this and so far we have been successful with > no further damaged FETs directly attributable to this problem. We have > modified all production to include these mods and have been installing them > in any units that come in for service. One unfortunate individual that must > live in the lightning capital of the world endured amp damage 3 times in as > many weeks. Now after the mods we have heard of no more damage. Whew! > Any one needing more information can contact us directly as we are trying > to document the mod procedure now so anyone experiencing probles can take > advantage of the changes. This problem from our perspective has been a very > small percentage of the units in the field. Contact us if you would like us > to mod the units here. We are trying to figure out an equitable way to > acoomplish this at a minimum cost to both parties. Again, not everyone will > need these mods. We hope to get an application note up on the web soon with > the change information also. > Thanks to every one for the tremendous support. You never know what we > might come up with next! > Lee K7TJR > _______________________________________________ > Hi-zreceivingarraydiscussions mailing list > Hi-zreceivingarraydiscussions at hizantennas.com > > http://mail.hizantennas.com/mailman/listinfo/hi-zreceivingarraydiscussions_hizantennas.com >