I hope that the initial shutdown time (and any subsequent attempts to restart) sent a hell of a jolt up the ax!
I used to work and airborne radar set that had overload protection on the magnetron. it took 7 successive misfires before it would shut down fully. One night while troubleshooting an intermittent problem we'd been having on an aircraft, I was in the hell-hole doing a visual inspection of the waveguide and wiring while my partner ran a test on the radar from the cockpit. Unfortunately for me, I found the problem. a broken piece of flexible waveguide that was only held together by the rubber. which broke when I flexed it. I felt all 7 of those transmitter pulses before that damn thing shut done. I had to have a couple of extra brews that night to ease the pain! Mike WM4B From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Bob M. Sent: Tuesday, April 22, 2008 5:48 PM To: [email protected] Subject: RE: [Repeater-Builder] Re: More on Copper theft Usually, when the impedance/VSWR changes a large amount, or the axe shorts the center to the outer conductors, the transmitter will fault and shut down. It may try to recycle a couple of times, but that's about it. They usually do a good job protecting themselves. I was working on some station wiring and plugged in a control box that had (unknown to me) latching relays. As soon as 120VAC was available, they dutifully activated the coaxial switches, putting the antenna on the other transmitter. There was a very loud crack from the transmitter as it arced and shut down; scared more than the s**t out of me, since that put the station off the air. The other transmitter was all apart and being cleaned. All I had to do was command the coax switch from the remote control to put it on the backup transmitter, then hit the Plate On, and things got running again. Taught me a lesson though. Bob M. ====== --- "Mike Besemer (WM4B)" <[EMAIL PROTECTED] <mailto:mwbesemer%40cox.net> > wrote: > http://radioinsight.com/boards/index.php?t=msg > <http://radioinsight.com/boards/index.php?t=msg <http://radioinsight.com/boards/index.php?t=msg&goto=58094&rid=0&S=67a57780f > &goto=58094&rid=0&S=67a57780f > 5f76038ba7ec84fc7e17077#msg_58094> > &goto=58094&rid=0&S=67a57780f5f76038ba7ec84fc7e17077#msg_58094 > > > > From what I understand, they took an ax to the > feedline and collected up the > pieces, along with whatever else they could carry. > > > > This is a 48 KW ERP radio station. I wonder if the > RF burns hurt?! > > > > Mike > > WM4B > > > > From: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> > [mailto:[email protected] <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf > Of skipp025 > Sent: Tuesday, April 22, 2008 4:28 PM > To: [email protected] <mailto:Repeater-Builder%40yahoogroups.com> > Subject: [Repeater-Builder] Re: More on Copper theft > > > > > > I Don't think this Copper Thieves are actually > Targeting > > Repeater Sites Etc , Some Sites are off the beaten > path > > and in Place not readily seen by some , It is just > bad > > People trying to make some money for whatever > > Most of the time it's meth... > > Out here on the West/left Coast we're seeing people > rip the wires > out of farm ag pump connections and in a more recent > case the > control wiring for a large railroad bridge while it > was stored in > the up position. > > Farmers seem to always have people coming up to ask > about any > stray metal they want hauled off... sometimes later > with permission > or not. Alarm system alerts through the business > radio equipment > have become a fairly nice side job. > > s. __________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
<<image001.jpg>>
<<image002.jpg>>
