[Lowfer] Successful Antennas 137 Khz With Near-Field Issues

[Warren]

Hi David,

     I have been using a transmit loop for the past 15 years on 137 kHz, 
it's made up of silver plated RG-214  coax 500' in length, center 
conductor connected to the shields.
It's in a vertical rectangle configuration, 80' ft on the vertical sides 
and 170 ft on the horizontal sides. I resonate it with mica caps and a 
15kv vacuum variable and match it to 50 ohms with a toroidal transformer.

     I have received reports from Siberia to Venezuela, I could count on 
seeing my signal 100% of the time (nights) in European grabbers.
     I guess I would say its a successful antenna.
    I have run 1200 Watts into it and got a measured 3.5-4 W ERP 
(Experimental License), as far as I could tell that was the highest ERP 
of any amateur/experimental station on 2200 meters, with the exception 
of temporary portable operations from the U.K. expedition to Pukeridge 
(using decommissioned Decca Navigator towers) and a Russian operation 
using a large LF broadcast tower.

   Bill Ashlock (sk) wrote two articles on the subject, in fact Bill 
helped me install the antenna.
http://njdtechnologies.net/wp-content/uploads/2017/04/Bill-Ashlock-loops-CQ-July-2017.pdf

73 Warren K2ORS




On 2/25/2018 10:59 AM, David Stinson wrote:
> Is there a list somewhere of the antennas used by
> those successful in QSOs on 137 KC, and how they
> have dealt with near-field problems like
> tree-covered lots?  I've heard people say a
> transmitting loop worked well and others say it
> was useless.  Is there a consensus on antennas
> with near-field obstructions?
>
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