Re: [IRCA] 9 Foot Longwave Box Loop (and other projects)

[D1028Gary@xxxxxxx]

Hi Kevin,
 
The 9 Foot Longwave box loop project was kind of an offshoot from the 10  
foot medium-wave box loop project, which used almost identical 1.25" diameter 
 PVC tubing. The only difference was that the LW version requires about 4 
times  as much #18 wire, which at today's copper price may deter a few LW 
enthusiasts  from building one of these monsters. Although I'm not an 
experienced LW DXer,  both the gain and directivity of this huge loop seem to be 
formidable  indeed. I plan to add a couple more turns to the loop to drop the 
coverage down  to 150 kHz, as Patrick suggests.
 
As for my sole neighbor, my full-size 2-element ham radio quad  antenna (on 
a 40' tower) was in full view, when he purchased his house.  Presumably, he 
knew what he was getting into. He jokes to his guests that I  "work for the 
CIA."
 
73, Gary
 
  
 
 
In a message dated 5/3/2009 10:02:38 P.M. Pacific Daylight Time,  
satya@xxxxxxxxxxxx writes:

Hey  Gary:

Wow, and I thought my 42" diagonal LW box loop was effective:  yours
probably has another 6 dB gain if my math is correct. Are you hearing  the
LW from Europe tonight that guys on the IRCA board are talking  about??

If one wanted to use this behemoth for LW beacons, which go  from about 200
to 530 khz, you would probably need about 15 turns or so;  perhaps 375' of
wire.  My loop tunes 200 khz to about 600 khz, for  which I had to use
about 330' of wire, I think.  To do both the LW  band down to 153 khz all
the way through 530 khz for beacons, I guess you'd  need to switch out some
capacitance, or wind the coil in two contra-wound  coils and switch those
out parallel/series.

So, what are you bribing  your neighbors with such that they don't run you
out of  town????


Kevin S
Bainbridge Island, WA



> If  you could add a couple more wraps to drop it to 150 khz, you would
>  cover the whole LW band, as the broadcasters start at 153 kHz and go  up
> to 279 kHz.
> It would be interesting to test that loop  against other kinds of
> antennas.
>
> 73,
>
>  Patrick
>
> Patrick Martin
> KGED QSL  Manager
>
>
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