Thanks Warren - interesting stuff !
Certainly the ground beneath the loop is probably a couple of Kv pd above the conductor at my Kw level - I can create colorful violet coronas :-) - and the capacitive affects of raising the or lowering the horizontal section of the loop just a few feet make a lot of change to the tuning -
Ive followed a suggestion to "relieve" earth losses/add a little more tuning stability by shoving a Earth mat under the loop here - at the moment it is untuned but installing it did cause an increase in loop current by a couple of percent - I saw a paper tuning this earth and it is was said to improve the stability and increase the effective power in this NVIS set up at 137.
Im using the underslung pulley system on mine at the moment which has survived one Alaskan winter :-) Rough diagram attached - there are two parallel conductors in this loop but a single black line is shown for clarity - adding a second conductor didnt change the efficiency much on 505kHz where its nearly resonant, but helped on 137
http://kl7uk.com/loopy.jpg Cheers
Laurence KL 1X WE2 XPQ
Alaska
Date: Fri, 26 Apr 2013 17:47:51 -0400
From:
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[email protected]Subject: Re: LF: Fire in the wire
Hi Stefan,
There are thousands or perhaps tens of thousands of volts from the loop to ground.
If I grounded the loop with and there was a large potential difference, wouldn't that cause a large current to flow to ground and effectively shunt my signal to ground?
73 Warren
