[600MRG] "Underground dog"

[patrick hamel]

Once upon a time there was a product called "invisible fence" to keep your dog inside the yard. 
A shock collar was put on the dog and a wire was buried around the property. 
When the dog approached the wire, the collar picked up a signal and shocked the dog.
Dogs soon learned that if they took a running leap across the wire they could go courting or hunting again.
The current way is to have the shock collar shock the dog if he gets too far away from a transmitter on the property - or if the power to the transmitter is lost.
You can see that digging a trench is no longer necessary, and there is lots of wire that has no buyers. This is the "Underground dog fence wire" referenced above.
Personally, I believe in training the dog and owner, not shocking the dog.
Pat



----- Original Message -----
From: "michael polia" <ab1aw at yahoo.com>
To: kl7aj at acsalaska.net, "dave riley3" <dave.riley3 at verizon.net>, 600mrg at w7ekb.com
Sent: Tuesday, November 14, 2017 5:04:56 PM
Subject: Re: [600MRG] MF Vertical Wire Loop

I think he meant ground hog.


      From: "kl7aj at acsalaska.net" <kl7aj at acsalaska.net>
 To: dave.riley3 at verizon.net; 600mrg at w7ekb.com 
 Sent: Tuesday, November 14, 2017 2:43 PM
 Subject: Re: [600MRG] MF Vertical Wire Loop
   
What is an underground dog?  :)



On Tue, 14 Nov 2017 14:40:50 -0500, Dave Riley  wrote:

>> *This transmitting loop has been up in the air here for about eight 
>> years or so...*
>> 
>> *1. The loop consists of ONE piece or wire and ONE variable capacitor, 
>> that's it...
>> **The high voltage wire is el-cheapo on e-bay search;
>> "Professional Electric Underground Dog Fence Wire 14 16 18 gauge 
>> 500/1000/1500"
>> Is very high voltage insulated wire and has 9 strands of copper in the 
>> various sizes...*
>> 
>> *2. This loop tunes from well below 15khz. ( SAQ ) on up to HF... You 
>> will need a decade box or other capacitor in parallel with the variable 
>> cap in order to tune _way down_ below to VLF...
>> *
>> 
>> *Here is simplified pix with plenty of space to make notes:
>> http://www.radiocom.net/600M/Loop2017a.jpg*
>> 
>> *Determine parameters of loop from this web page:
>> Tells you everything you want to know...
>> http://www.66pacific.com/calculators/small-transmitting-loop-antenna-calculator.aspx*
>> 
>> *It's too easy, requires no radials, coax, relays, etc...
>> Installs in one hour with poly-rope..*
>> 
>> *The variometer here has 6 turns of HV wire wound over the cold end in 
>> order to couple the TX RFPA final with NO HV DC on the variometer ( 
>> safety )..
>> At the top of the vario is a great spot for an e-probe for 'very fast' 
>> QSK with no relays...
>> If you don't care about the receive 'pre-select' effect then go wide 
>> band by placing the e-probe placed near the wire of the loop itself...
>> *
>> 
>> *The bananna jacks at the bottom allow you to insert a toroid 
>> transformer if you like...*
>> 
>> *I will add some 'extras' but first try a loop and see more quiet RX and 
>> higher efficiency RR above poor ground which is most everywhere )...*
>> 
>> *TNX from DaveR AA1A*
>> 
>> 
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