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

[Warren]

Hi,

   Forgot to mention that I live in New England in a heavily wooded lot.

73 Warren


On 2/25/2018 11:53 AM, Warren wrote:
>
> 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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