I posted this on the microwave reflector just a bit ago. It occurred to me that this group might also enjoy it: I don’t suppose I am the first one to do this, but I repaired a female N connector on my 7/8” hardline. The center pin had broken off. I thought it was pretty slick how I did it, so I will post it here. I recovered a center pin from a broken, cheap Chinese adapter. With a Dremel and cutoff wheel, I dressed the broken stub of the pin. Using the flat side of the cutoff wheel as a mini-grinder and a jeweler’s file, I reduced the diameters of the new pin and the old stub slightly. Then I removed about a quarter inch of UT-141 Shield and slipped it over the two pieces and soldered. The finished product is strong and should last through many connectings. Now I know that altering the geometry of these connectors changes the impedance, so I measured with my caliper to see just how badly I had altered the impedance. I used the 138Log b/a. I found some surprising results. An original, unaltered connector yielded the value of 55.35 ohms. With the repaired connector having a .141 center diameter now, the value calculated to be 52.75 ohms. What!!? Do you mean to say that I actually improved the impedance with my repair? I doubt it very much. The SWR and loss measurements on the repaired cable show no significant degradation, compared to the original. I will accept it for what it is. I have avoided buying another connector to repair this cable run. 73, Dave, K4TO

Very interesting. I have one to repair myself, so this is useful! By the way, I found out that the innards of all the N - C series connectors all fit inside one another. N, BNC, TNC, C, etc. A male BNC without the bayonet locking connector will fit inside an N or TNC connector. 73, Zack W9SZ On Thu, Jun 29, 2017 at 5:20 PM, Dave Sublette via mvus-list <mvus-list@febo.com> wrote: > I posted this on the microwave reflector just a bit ago. It occurred to me that this group might also enjoy it: > > I don’t suppose I am the first one to do this, but I repaired a female N connector on my 7/8” hardline. The center pin had broken off. I thought it was pretty slick how I did it, so I will post it here. > > I recovered a center pin from a broken, cheap Chinese adapter. With a Dremel and cutoff wheel, I dressed the broken stub of the pin. Using the flat side of the cutoff wheel as a mini-grinder and a jeweler’s file, I reduced the diameters of the new pin and the old stub slightly. Then I removed about a quarter inch of UT-141 Shield and slipped it over the two pieces and soldered. > > The finished product is strong and should last through many connectings. > > Now I know that altering the geometry of these connectors changes the impedance, so I measured with my caliper to see just how badly I had altered the impedance. I used the 138Log b/a. I found some surprising results. An original, unaltered connector yielded the value of 55.35 ohms. With the repaired connector having a .141 center diameter now, the value calculated to be 52.75 ohms. What!!? Do you mean to say that I actually improved the impedance with my repair? I doubt it very much. The SWR and loss measurements on the repaired cable show no significant degradation, compared to the original. I will accept it for what it is. I have avoided buying another connector to repair this cable run. > > 73, > > Dave, K4TO > > > _______________________________________________ > mvus-list mailing list > mvus-list@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list <div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br /> <table style="border-top: 1px solid #D3D4DE;"> <tr> <td style="width: 55px; padding-top: 13px;"><a href="https://www.avast.com/lp-safe-emailing-3177-a?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-3177-a" target="_blank"><img src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" alt="" width="46" height="29" style="width: 46px; height: 29px;" /></a></td> <td style="width: 470px; padding-top: 12px; color: #41424e; font-size: 13px; font-family: Arial, Helvetica, sans-serif; line-height: 18px;">Virus-free. <a href="https://www.avast.com/lp-safe-emailing-3177-a?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-3177-a" target="_blank" style="color: #4453ea;">www.avast.com</a> </td> </tr> </table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div>

True, but be careful about the different center pin diameters. It's ok for a quick test to put the different series together carefully but don't push too hard. From Tom Holmes, N8ZM > On Jun 29, 2017, at 6:42 PM, Zack Widup via mvus-list <mvus-list@febo.com> wrote: > > Very interesting. I have one to repair myself, so this is useful! > > By the way, I found out that the innards of all the N - C series > connectors all fit inside one another. N, BNC, TNC, C, etc. A male BNC > without the bayonet locking connector will fit inside an N or TNC > connector. > > 73, Zack W9SZ > > > On Thu, Jun 29, 2017 at 5:20 PM, Dave Sublette via mvus-list > <mvus-list@febo.com> wrote: >> I posted this on the microwave reflector just a bit ago. It occurred to me that this group might also enjoy it: >> >> I don’t suppose I am the first one to do this, but I repaired a female N connector on my 7/8” hardline. The center pin had broken off. I thought it was pretty slick how I did it, so I will post it here. >> >> I recovered a center pin from a broken, cheap Chinese adapter. With a Dremel and cutoff wheel, I dressed the broken stub of the pin. Using the flat side of the cutoff wheel as a mini-grinder and a jeweler’s file, I reduced the diameters of the new pin and the old stub slightly. Then I removed about a quarter inch of UT-141 Shield and slipped it over the two pieces and soldered. >> >> The finished product is strong and should last through many connectings. >> >> Now I know that altering the geometry of these connectors changes the impedance, so I measured with my caliper to see just how badly I had altered the impedance. I used the 138Log b/a. I found some surprising results. An original, unaltered connector yielded the value of 55.35 ohms. With the repaired connector having a .141 center diameter now, the value calculated to be 52.75 ohms. What!!? Do you mean to say that I actually improved the impedance with my repair? I doubt it very much. The SWR and loss measurements on the repaired cable show no significant degradation, compared to the original. I will accept it for what it is. I have avoided buying another connector to repair this cable run. >> >> 73, >> >> Dave, K4TO >> >> >> _______________________________________________ >> mvus-list mailing list >> mvus-list@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list > <div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br /> > <table style="border-top: 1px solid #D3D4DE;"> > <tr> > <td style="width: 55px; padding-top: 13px;"><a > href="https://www.avast.com/lp-safe-emailing-3177-a?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-3177-a" > target="_blank"><img > src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-round-orange-animated-no-repeat-v1.gif" > alt="" width="46" height="29" style="width: 46px; height: 29px;" > /></a></td> > <td style="width: 470px; padding-top: 12px; color: #41424e; > font-size: 13px; font-family: Arial, Helvetica, sans-serif; > line-height: 18px;">Virus-free. <a > href="https://www.avast.com/lp-safe-emailing-3177-a?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=oa-3177-a" > target="_blank" style="color: #4453ea;">www.avast.com</a> > </td> > </tr> > </table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" > height="1"></a></div> > _______________________________________________ > mvus-list mailing list > mvus-list@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list

Hi Dave, I wonder if it would be ok if I copy this email to the "Cheese Bits" newsletter of the Mt Airy VHF Radio Club (the "Packrats") some time this summer or fall? 73, Lenny W2BVH (editor) On 6/29/2017 6:20 PM, Dave Sublette via mvus-list wrote: > I posted this on the microwave reflector just a bit ago. It occurred to me that this group might also enjoy it: > > I don’t suppose I am the first one to do this, but I repaired a female N connector on my 7/8” hardline. The center pin had broken off. I thought it was pretty slick how I did it, so I will post it here. > > I recovered a center pin from a broken, cheap Chinese adapter. With a Dremel and cutoff wheel, I dressed the broken stub of the pin. Using the flat side of the cutoff wheel as a mini-grinder and a jeweler’s file, I reduced the diameters of the new pin and the old stub slightly. Then I removed about a quarter inch of UT-141 Shield and slipped it over the two pieces and soldered. > > The finished product is strong and should last through many connectings. > > Now I know that altering the geometry of these connectors changes the impedance, so I measured with my caliper to see just how badly I had altered the impedance. I used the 138Log b/a. I found some surprising results. An original, unaltered connector yielded the value of 55.35 ohms. With the repaired connector having a .141 center diameter now, the value calculated to be 52.75 ohms. What!!? Do you mean to say that I actually improved the impedance with my repair? I doubt it very much. The SWR and loss measurements on the repaired cable show no significant degradation, compared to the original. I will accept it for what it is. I have avoided buying another connector to repair this cable run. > > 73, > > Dave, K4TO > > > _______________________________________________ > mvus-list mailing list > mvus-list@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list >

Hello Lenny, Yes, you may publish this item in the newsletter. I am pleased if anything I do helps someone. I appreciate your asking to do this. I am using the repaired feed line on 6 meters now and worked 25 QSOs as far as California yesterday. I could have bought a replacement connector and not been too sad, but recovering an item that might otherwise have gone to the recycle bin is a great satisfaction. 73, Dave, K4TO > On Jul 1, 2017, at 2:13 PM, Lenny via mvus-list <mvus-list@febo.com> wrote: > > Hi Dave, > > I wonder if it would be ok if I copy this email to the "Cheese Bits" newsletter of the Mt Airy VHF Radio Club (the "Packrats") some time this summer or fall? > > 73, > > Lenny W2BVH (editor) > > > On 6/29/2017 6:20 PM, Dave Sublette via mvus-list wrote: >> I posted this on the microwave reflector just a bit ago. It occurred to me that this group might also enjoy it: >> >> I don’t suppose I am the first one to do this, but I repaired a female N connector on my 7/8” hardline. The center pin had broken off. I thought it was pretty slick how I did it, so I will post it here. >> >> I recovered a center pin from a broken, cheap Chinese adapter. With a Dremel and cutoff wheel, I dressed the broken stub of the pin. Using the flat side of the cutoff wheel as a mini-grinder and a jeweler’s file, I reduced the diameters of the new pin and the old stub slightly. Then I removed about a quarter inch of UT-141 Shield and slipped it over the two pieces and soldered. >> >> The finished product is strong and should last through many connectings. >> >> Now I know that altering the geometry of these connectors changes the impedance, so I measured with my caliper to see just how badly I had altered the impedance. I used the 138Log b/a. I found some surprising results. An original, unaltered connector yielded the value of 55.35 ohms. With the repaired connector having a .141 center diameter now, the value calculated to be 52.75 ohms. What!!? Do you mean to say that I actually improved the impedance with my repair? I doubt it very much. The SWR and loss measurements on the repaired cable show no significant degradation, compared to the original. I will accept it for what it is. I have avoided buying another connector to repair this cable run. >> >> 73, >> >> Dave, K4TO >> >> >> _______________________________________________ >> mvus-list mailing list >> mvus-list@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list >> > > _______________________________________________ > mvus-list mailing list > mvus-list@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/mvus-list