Re: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Muahhh, We just had the same problem. Took out the antenna, jumper to the antenna from 1 5/8 hardline, and arrestor. System showed good vswr and worked pretty good. We did suffer damage to the RF Final PA. At 50 watts no problem, but when the PA was fixed it would cut back to about 100 watts out from 250 watts. Thought we were going to need to replaced the 1 5/8 hardline. Did a little more checking and found an ARC on the inside of the coax connector attached to the arrestor. Cut back 1" on the hardline, installed a new connector, all is working very well. Full power out, and 1.13:1 VSWR. I hope this helps. Charles Miller - Original Message - From: "muahhh" <[EMAIL PROTECTED]> To: Sent: Thursday, June 01, 2006 9:24 PM Subject: [Repeater-Builder] Problem of repeater after lighting striked RX antenna > Hi.. > > Recently, the repeater i was maintaining was hit by lightining. The > whole antenna was gone, and our turbo fans were fried.. > > However, luckilky, all the radios are still on.. > > I've changed the RX antenna, the pre-amp and the lightning arrester. > However, when we tested, between two points, lets say A and B.. A is > nearer to the repeater and B is further.. when A calls B, B could > hear, but when they reply back A couldn't hear.. > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Okay, Unlikley, but the problem nevertheless. Our preamp was fried on our site. Even though it seemed to be working fine for all of the other stations that are hooked up to it. Weird, but problem solved. You can now hit our machine over 40 miles away on an HT at 5w. Thanks and good luck with yours. Dandan ryant <[EMAIL PROTECTED]> wrote:Jeff, I am going to continue monitoring this post as the ham repeater here in Red Bluff seems to have suffered the exact same problem, less the fried antenna. The former radio tech is going to be going up to check it out for us. Jake, the repeater owner was unable to find the problem at first quick look. If we figure it out on ours, I will pass the information to you. Good luck & 73s Dan KF6ZJDJeff DePolo <[EMAIL PROTECTED]> wrote: Did you test/inspect the feedline? Arc-over within the coax isn't uncommon,and can leave resistive pathways between center and shield that translateinto high loss and/or high VSWR. Center pins on connectors are often burnedor vaporized in a good strike. Is the new Rx antenna and exact replacement of the former?--- Jeff> -Original Message-> From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of muahhh> Sent: Thursday, June 01, 2006 10:25 PM> To: Repeater-Builder@yahoogroups.com> Subject: [Repeater-Builder] Problem of repeater after > lighting striked RX antenna> > Hi..> > Recently, the repeater i was maintaining was hit by lightining. The > whole antenna was gone, and our turbo fans were fried..> > However, luckilky, all the radios are still on..> > I've changed the RX antenna, the pre-amp and the lightning arrester. > However, when we tested, between two points, lets say A and B.. A is > nearer to the repeater and B is further.. when A calls B, B could > hear, but when they reply back A couldn't hear.. > > What could be the problem? I've changed the RX radio, but still the > situation is like this.. it seems that the coverage of the repeater > is smaller than before..> > Is there any thing that i should check also or changed.. What should > i do when lightning strikes..?> > Thanx> > Fred> > > > > > > > > > > > Yahoo! Groups Links> > > > > > > -- > No virus found in this incoming message.> Checked by AVG Free Edition.> Version: 7.1.394 / Virus Database: 268.8.0/353 - Release > Date: 5/31/2006> > Yahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
dan ryant wrote: > Could the problem be something else? The reason why Im asking this is > because the ham radio system that we are on is connected to State > equipment. Namely, CDF and law enforcement through a combiner on the > RX side. The TX on the machine is working great but the RX is very > shotty. > ps. This is not the author of the original post. We just happen to > be experiecning the same problems after a lightning storm and I didn't > want to start a new thread. (Keep all good info in one place for both > to read) > Thanks > Dan So if the only question you have is "Can lightning cause other types of damage?" -- I'm sure the answer is a resounding YES from all of us on the list. :-) Is there another question in there I'm not seeing? We could list off possible damage types all day long, but until you've gone and tested the basics... you're flying blind. But if you know you took a strike and the repeater no longer operates correctly, you definitely have a problem to go troubleshoot. Time for a site trip. 'Tis the season! :-) Nate WY0X Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
The lightning did create some damage. Since you are stating it is in the receiver, you will have to check the antenna , the feedline, and any ancillary components connected to the former. If you did not have any lightning protection, then either the antenna or one of the connectors arced over and did the job for it. You can find out by either using an swr analyzer that will work in a high rf environment or simply get a low power ht and swr meter and get the swr on the antenna. If it is high, at least you will have a direction to go for your investigations. Adam Kb2jpd Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Could the problem be something else? The reason why Im asking this is because the ham radio system that we are on is connected to State equipment. Namely, CDF and law enforcement through a combiner on the RX side. The TX on the machine is working great but the RX is very shotty. ps. This is not the author of the original post. We just happen to be experiecning the same problems after a lightning storm and I didn't want to start a new thread. (Keep all good info in one place for both to read) Thanks DanEric Lemmon <[EMAIL PROTECTED]> wrote: Fred,Since you imply that this is a two-antenna system without a duplexer, theonly item that you have not changed is the RX antenna feedline. Beforeassuming that it might be defective, use a TDR test set to sweep the cable.Also check any jumpers or adapters that may be in the receive path. Sincerepeater coverage is primarily limited by how well the repeater can hear thestations in the field, check anything and everything that is associated withthe receive path.73, Eric Lemmon WB6FLY-Original Message-From: Repeater-Builder@yahoogroups.com[mailto:[EMAIL PROTECTED] On Behalf Of muahhhSent: Thursday, June 01, 2006 7:25 PMTo: Repeater-Builder@yahoogroups.comSubject: [Repeater-Builder] Problem of repeater after lighting striked RXantennaHi..Recently, the repeater I was maintaining was hit by lightning. The whole antenna was gone, and our turbo fans were fried..However, luckily, all the radios are still on..I've changed the RX antenna, the pre-amp and the lightning arrester. However, when we tested, between two points, let's say A and B.. A is nearer to the repeater and B is further.. when A calls B, B could hear, but when they reply back A couldn't hear.. What could be the problem? I've changed the RX radio, but still the situation is like this.. it seems that the coverage of the repeater is smaller than before..Is there any thing that i should check also or changed.. What should i do when lightning strikes..?ThanxFredYahoo! Groups LinksYahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Jeff, I am going to continue monitoring this post as the ham repeater here in Red Bluff seems to have suffered the exact same problem, less the fried antenna. The former radio tech is going to be going up to check it out for us. Jake, the repeater owner was unable to find the problem at first quick look. If we figure it out on ours, I will pass the information to you. Good luck & 73s Dan KF6ZJDJeff DePolo <[EMAIL PROTECTED]> wrote: Did you test/inspect the feedline? Arc-over within the coax isn't uncommon,and can leave resistive pathways between center and shield that translateinto high loss and/or high VSWR. Center pins on connectors are often burnedor vaporized in a good strike. Is the new Rx antenna and exact replacement of the former?--- Jeff> -Original Message-> From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of muahhh> Sent: Thursday, June 01, 2006 10:25 PM> To: Repeater-Builder@yahoogroups.com> Subject: [Repeater-Builder] Problem of repeater after > lighting striked RX antenna> > Hi..> > Recently, the repeater i was maintaining was hit by lightining. The > whole antenna was gone, and our turbo fans were fried..> > However, luckilky, all the radios are still on..> > I've changed the RX antenna, the pre-amp and the lightning arrester. > However, when we tested, between two points, lets say A and B.. A is > nearer to the repeater and B is further.. when A calls B, B could > hear, but when they reply back A couldn't hear.. > > What could be the problem? I've changed the RX radio, but still the > situation is like this.. it seems that the coverage of the repeater > is smaller than before..> > Is there any thing that i should check also or changed.. What should > i do when lightning strikes..?> > Thanx> > Fred> > > > > > > > > > > > Yahoo! Groups Links> > > > > > > -- > No virus found in this incoming message.> Checked by AVG Free Edition.> Version: 7.1.394 / Virus Database: 268.8.0/353 - Release > Date: 5/31/2006> > Yahoo! Groups Links<*> To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/<*> To unsubscribe from this group, send an email to:[EMAIL PROTECTED]<*> Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/ __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
On Jun 1, 2006, at 8:24 PM, muahhh wrote: > However, luckilky, all the radios are still on.. Do you have any baseline sensitivity measurements like a 12 dB SINAD point on the original setup? Hard to say if your receiver is still as sensitive as it once was if you don't have anything to measure against. > I've changed the RX antenna, the pre-amp and the lightning arrester. > However, when we tested, between two points, lets say A and B.. A is > nearer to the repeater and B is further.. when A calls B, B could > hear, but when they reply back A couldn't hear.. Other people mentioned the feedline and connectors, but another question came to mind: Did you have a pre-amp in line? The above measurement would tell you if it's still working. > What could be the problem? I've changed the RX radio, but still the > situation is like this.. it seems that the coverage of the repeater > is smaller than before.. Ah, different receiver. Okay. So if you know how sensitive the receiver was on the original you can compare them. If not, you're guessing. > Is there any thing that i should check also or changed.. What should > i do when lightning strikes..? Another thought - is it a properly grounded site with a polyphaser at an entrance panel? If so, did the polyphaser blow? I'm guessing not since you're saying it's generally working, but might be worth a look for damage if you have one. Assuming you have no filter cavities and are running dual-antenna only, it rules out damage to the filters, but if you're using a bandpass cavity, check it out for signs of arc damage also. Nate WY0X Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Fred, Since you imply that this is a two-antenna system without a duplexer, the only item that you have not changed is the RX antenna feedline. Before assuming that it might be defective, use a TDR test set to sweep the cable. Also check any jumpers or adapters that may be in the receive path. Since repeater coverage is primarily limited by how well the repeater can hear the stations in the field, check anything and everything that is associated with the receive path. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of muahhh Sent: Thursday, June 01, 2006 7:25 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Problem of repeater after lighting striked RX antenna Hi.. Recently, the repeater I was maintaining was hit by lightning. The whole antenna was gone, and our turbo fans were fried.. However, luckily, all the radios are still on.. I've changed the RX antenna, the pre-amp and the lightning arrester. However, when we tested, between two points, let's say A and B.. A is nearer to the repeater and B is further.. when A calls B, B could hear, but when they reply back A couldn't hear.. What could be the problem? I've changed the RX radio, but still the situation is like this.. it seems that the coverage of the repeater is smaller than before.. Is there any thing that i should check also or changed.. What should i do when lightning strikes..? Thanx Fred Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Problem of repeater after lighting striked RX antenna
Did you test/inspect the feedline? Arc-over within the coax isn't uncommon, and can leave resistive pathways between center and shield that translate into high loss and/or high VSWR. Center pins on connectors are often burned or vaporized in a good strike. Is the new Rx antenna and exact replacement of the former? --- Jeff > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of muahhh > Sent: Thursday, June 01, 2006 10:25 PM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Problem of repeater after > lighting striked RX antenna > > Hi.. > > Recently, the repeater i was maintaining was hit by lightining. The > whole antenna was gone, and our turbo fans were fried.. > > However, luckilky, all the radios are still on.. > > I've changed the RX antenna, the pre-amp and the lightning arrester. > However, when we tested, between two points, lets say A and B.. A is > nearer to the repeater and B is further.. when A calls B, B could > hear, but when they reply back A couldn't hear.. > > What could be the problem? I've changed the RX radio, but still the > situation is like this.. it seems that the coverage of the repeater > is smaller than before.. > > Is there any thing that i should check also or changed.. What should > i do when lightning strikes..? > > Thanx > > Fred > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.394 / Virus Database: 268.8.0/353 - Release > Date: 5/31/2006 > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Problem of repeater after lighting striked RX antenna
Hi.. Recently, the repeater i was maintaining was hit by lightining. The whole antenna was gone, and our turbo fans were fried.. However, luckilky, all the radios are still on.. I've changed the RX antenna, the pre-amp and the lightning arrester. However, when we tested, between two points, lets say A and B.. A is nearer to the repeater and B is further.. when A calls B, B could hear, but when they reply back A couldn't hear.. What could be the problem? I've changed the RX radio, but still the situation is like this.. it seems that the coverage of the repeater is smaller than before.. Is there any thing that i should check also or changed.. What should i do when lightning strikes..? Thanx Fred Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
