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Long wire antennas MORE

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Mal Speer

Long wire antennas MORE

I don't know much about antennas, but in the late 60s or early 70s I worked
a station on 20 meters with a 10 mile long (long wire antenna).

That was KC4AAD in Antarctica. I don't have the QSL card I got back then,
but was a picture of part of the antenna. I know it was 20 meters, because I
only had a 20 meter antenna. A 3El wide spaced monobander up about 35 feet.

Mal WA2TWA

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briancom

Re: Long wire antennas MORE

Just for kicks, I modeled it with a 1/4 wave counter poise up 12' up
from ground. 14 MHz.

Unfortunately where ground is a question. What the parameters for
"ground" is a good question. Snow doesn't look like earth.

Anyhow the impedance came out 11470 ohms +j 17880.
The horizontal antenna pattern was along the axis with a beam width of
3.8 degrees and a gain of almost 15 db

The vertical pattern peaked at 3 degrees and straight up 5 dB down.

73 de Brian/K3KO

On 1/12/2018 16:18 PM, Mal Speer wrote:

> I don't know much about antennas, but in the late 60s or early 70s I worked
> a station on 20 meters with a 10 mile long (long wire antenna).
>
> That was KC4AAD in Antarctica. I don't have the QSL card I got back then,
> but was a picture of part of the antenna. I know it was 20 meters, because I
> only had a 20 meter antenna. A 3El wide spaced monobander up about 35 feet.
>
> Mal WA2TWA
>
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
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> Post: mailto:[hidden email]
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> Please help support this email list: http://www.qsl.net/donate.html
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> ---
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Cady, Fred-2

Re: Long wire antennas MORE

I wintered over at Byrd Station in 67-68. The "Long Wire" VLF station was, as I remember, about 11 miles away from the main Byrd station to get away from noise sources for the research that was being done. Several of us at Byrd walked out there one day (although I guess it was night, seeing as how nights were 4 months long). I'm pretty sure the 10 mile antenna was for receiving but KC4AAD might have used it for transmitting. My own station, KC4USM, used a 700' long vee beam, on the ice. "Ground" was something like 7000' below, 2000' below sea level.

Cheers and 73,

Fred KE7X OAE

________________________________
From: [hidden email] <[hidden email]> on behalf of brian <[hidden email]>
Sent: Friday, January 12, 2018 9:35 AM
To: [hidden email]
Subject: Re: [Elecraft] Long wire antennas MORE

Just for kicks, I modeled it with a 1/4 wave counter poise up 12' up
from ground. 14 MHz.

Unfortunately where ground is a question. What the parameters for
"ground" is a good question. Snow doesn't look like earth.

Anyhow the impedance came out 11470 ohms +j 17880.
The horizontal antenna pattern was along the axis with a beam width of
3.8 degrees and a gain of almost 15 db

The vertical pattern peaked at 3 degrees and straight up 5 dB down.

73 de Brian/K3KO

On 1/12/2018 16:18 PM, Mal Speer wrote:

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k6dgw

Re: Long wire antennas MORE

For transmitting, that 10-mile long conductor would be close to an
end-fed full-wave, and perhaps a flame-thrower, for SAQ [17 KHz]. On 20
meters, it would be an end-fed 805 wavelength conductor [wonder how that
would model in EZNEC?], all the power dissipated in the first few
hundred meters of the conductor, and most of the conductor in the far,
far, far field of the antenna that is actually radiating.

Actually, I have the urge to waste a little time, QRX, I'll try it.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/12/2018 11:34 AM, Cady, Fred wrote:
> I wintered over at Byrd Station in 67-68. The "Long Wire" VLF station was, as I remember, about 11 miles away from the main Byrd station to get away from noise sources for the research that was being done. Several of us at Byrd walked out there one day (although I guess it was night, seeing as how nights were 4 months long). I'm pretty sure the 10 mile antenna was for receiving but KC4AAD might have used it for transmitting. My own station, KC4USM, used a 700' long vee beam, on the ice. "Ground" was something like 7000' below, 2000' below sea level.
>
> Cheers and 73,
>
> Fred KE7X OAE
>

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k6dgw

Re: Long wire antennas MORE

In reply to this post by Cady, Fred-2

Well, bummer! EZNEC4+ won't model a conductor 52,800 feet long. :-(

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 1/12/2018 11:34 AM, Cady, Fred wrote:

> I wintered over at Byrd Station in 67-68. The "Long Wire" VLF station was, as I remember, about 11 miles away from the main Byrd station to get away from noise sources for the research that was being done. Several of us at Byrd walked out there one day (although I guess it was night, seeing as how nights were 4 months long). I'm pretty sure the 10 mile antenna was for receiving but KC4AAD might have used it for transmitting. My own station, KC4USM, used a 700' long vee beam, on the ice. "Ground" was something like 7000' below, 2000' below sea level.
>
> Cheers and 73,
>
> Fred KE7X OAE
>
>
>
> ________________________________
> From: [hidden email] <[hidden email]> on behalf of brian <[hidden email]>
> Sent: Friday, January 12, 2018 9:35 AM
> To: [hidden email]
> Subject: Re: [Elecraft] Long wire antennas MORE
>
> Just for kicks, I modeled it with a 1/4 wave counter poise up 12' up
> from ground. 14 MHz.
>
> Unfortunately where ground is a question. What the parameters for
> "ground" is a good question. Snow doesn't look like earth.
>
> Anyhow the impedance came out 11470 ohms +j 17880.
> The horizontal antenna pattern was along the axis with a beam width of
> 3.8 degrees and a gain of almost 15 db
>
> The vertical pattern peaked at 3 degrees and straight up 5 dB down.
>
> 73 de Brian/K3KO
>
> On 1/12/2018 16:18 PM, Mal Speer wrote:
>> I don't know much about antennas, but in the late 60s or early 70s I worked
>> a station on 20 meters with a 10 mile long (long wire antenna).
>>
>> That was KC4AAD in Antarctica. I don't have the QSL card I got back then,
>> but was a picture of part of the antenna. I know it was 20 meters, because I
>> only had a 20 meter antenna. A 3El wide spaced monobander up about 35 feet.
>>
>> Mal WA2TWA
>>
>>
>>
>>
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>> ---
>> This email has been checked for viruses by AVG.
>> http://www.avg.com
>>
> ______________________________________________________________
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>
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> ______________________________________________________________
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>
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>