[600MRG] MF Vertical Wire Loop

[kl7aj at acsalaska.net]

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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