Re: Re: [Elecraft] OT: Electric fences
I don't have any but several of my neighbors do. I told them my problem and asked if they would mind if I just ran their fence line and fixed whatever I found every now and then. All welcomed me. The problem is almost always an arc to the T-post, a tree trunk, a tall weed that has grown up under the wire, and the like. Greg - AB7R wrote: I gotta chime in here. I have an electric fence. It is put up correctly, and it does pop on the radio. It is nice though that the K3 noise blanker either eliminates it or at least reduces it to a manageable level...usually depends on the Yep. One of the fences is over a mile long, and even though it is installed well and I've been its entire length and it is clear of arcs and bad splices, I can still hear it weakly. Ordinarily, the current drawn from the charger on a pulse is miniscule ... it's just a voltage pulse. I suspect that the long fence exhibits enough capacitance that it actually does draw current from the charger on each pulse, and Pwr = Voltage X Current. The K3 NB gets rid of all of it. 73, Fred K6DGW - Northern California Contest Club - CU in the 2008 Cal QSO Party 4-5 Oct 08 - www.cqp.org ___ 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
Re: [Elecraft] OT: Electric fences
I have a pulse noise that I thought was a fence charger, but it is to the north and the only electric fence that I have found is south east. In another internet discussion someone mentioned that he had traced a similar interference to a blinking caution light. Sure enough I have a blinking caution light 1.5 miles to the north. Fortunately for me the interference is very light and can only be heard on a nearly dead band. Fence chargers are not the only source of a pulse with about one second interval. Willis 'Cookie' Cooke K5EWJ --- On Thu, 8/21/08, Tom W8JI <[EMAIL PROTECTED]> wrote: > From: Tom W8JI <[EMAIL PROTECTED]> > Subject: Re: [Elecraft] OT: Electric fences > To: "Ken Kopp" <[EMAIL PROTECTED]>, elecraft@mailman.qth.net > Date: Thursday, August 21, 2008, 6:01 PM > > Again, the noise isn't from the charger ... > it's generated > > along the wire. Carrying an AM radio along the fence > may > > be helpful and is useful in illustrating to the fence > > > owner what > > you're talking about. He/she may already be aware > of the > > noise and not know the source. (:-)) > > While it is true most problems seem to be caused by bad > connections in the fence, the most severe problem I had > with > an electric fence was caused by a charger! The charger was > sent back and the replacement charger produced exactly the > same problem. I put RF chokes on it, ferrite beads, you > name > it. > > My neighbor switched to a different brand and the problem > vanished. > > I've generally had varying success with an AM broadcast > > radio, but a VHF aircraft radio always lets me walk right > up > to the bad area. > > 73 Tom > > > > > ___ > 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 ___ 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
RE: [Elecraft] OT: Electric fences
I've generally had varying success with an AM broadcast radio, but a VHF aircraft radio always lets me walk right up to the bad area. 73 Tom - Many Hams today don't realize that the VHF aircraft band is AM, not FM such as most hand-held Ham VHF radios use. Of course, FM is inherently noise suppressing, ignoring all amplitude modulation. That makes most Ham hand-helds useless for this purpose. However, some do receive the 120 MHz aircraft band with an AM detector. My Icom W32A is one of those. It is excellent for chasing noise, as Tom notes. The noise tends to be weaker and not propagate so easily at 120 MHz, so the source is usually much more clearly defined as you wander around with the radio in hand. Ron AC7AC ___ 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
Re: [Elecraft] OT: Electric fences
Again, the noise isn't from the charger ... it's generated along the wire. Carrying an AM radio along the fence may be helpful and is useful in illustrating to the fence owner what you're talking about. He/she may already be aware of the noise and not know the source. (:-)) While it is true most problems seem to be caused by bad connections in the fence, the most severe problem I had with an electric fence was caused by a charger! The charger was sent back and the replacement charger produced exactly the same problem. I put RF chokes on it, ferrite beads, you name it. My neighbor switched to a different brand and the problem vanished. I've generally had varying success with an AM broadcast radio, but a VHF aircraft radio always lets me walk right up to the bad area. 73 Tom ___ 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
Re: [Elecraft] OT: Electric fences
Hi Greg, I have three within a block of me that I've "fixed" and aren't a problem ... BUT none on my own property. (:-)) Isn't this a form of self-inflicted injury? I've heard that most critters ... once bit ... never approach the fence again. Maybe that would work in your case, or maybe intermittent operation would fool 'em. 73! Ken ___ 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
Re: [Elecraft] OT: Electric fences
I gotta chime in here. I have an electric fence. It is put up correctly, and it does pop on the radio. It is nice though that the K3 noise blanker either eliminates it or at least reduces it to a manageable level...usually depends on the band. - 73, Greg - AB7R Whidbey Island WA NA-065 On Thu Aug 21 14:19 , "Ken Kopp" sent: >Electric fence chargers don't (normally) cause noise. >Its the installation of the wires they feed that causes >noise. > >There are two kinds of chargers ... one generates a >quick pulse ... a "pop" ... and the other generates a >longer burst of energy and makes a "bzzzt" sound. >The later is often called a "weed burner". It's intent >is to burn away any weed that grows into contact with >the fence. > >I have had good luck with asking / offering the owner >if I can fix the fence, with an emphasis on "it will work >better when I'm through". > >They're almost always put up poorly, with no knowledge >of how to do the job correctly. Joints are made by simply >making two loops together like one would link two index >fingers together. These need to be twisted ... tightly. >Ditto for the tie-wires used to fasten wire to insulators. > >Sometimes there are -NO- insulators used on wood fence >posts, and I have found the charged wire stapled to the >post. If the staple isn't tight, a tiny arc will result. This is >one common source of "power line noise" on power line >distribution system pole ground wires, BTW. It's been known >to set poles ablaze. There are insulated gate hooks that are >fine sources of noise. > >Look at an electric fence as an antenna and construct it >in the same way. It will be much more likely to be "quiet". > >Again, the noise isn't from the charger ... it's generated >along the wire. Carrying an AM radio along the fence may >be helpful and is useful in illustrating to the fence owner what >you're talking about. He/she may already be aware of the >noise and not know the source. (:-)) > >73! Ken Kopp - K0PP > [EMAIL PROTECTED] >___ >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 ___ 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
