[600MRG] MF Vertical Wire Loop
michael polia
ab1aw at yahoo.com
Tue Nov 14 17:04:56 CST 2017
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*
>>
>>
>> _______________________________________________
>> 600MRG mailing list
>> 600MRG at w7ekb.com
>> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
_______________________________________________
600MRG mailing list
600MRG at w7ekb.com
http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
More information about the 600MRG
mailing list