Re: [Elecraft] ARRL book on receiving antennas

[Jim Brown]

On 9/10/2018 1:25 PM, GWK wrote:
We call it a "ground plane" antenna. 


No, it's quite different.

73, Jim K9YC

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[Elecraft] FS: Older ARRL Handbooks, 1953-1986

[Alan D. Wilcox]

Hello,

The house cleaning continues … see my site for the latest list:
https://wilcoxengineering.com/2018/08/21/selling-extra-equipment/

Cheers,
Alan

Alan D. Wilcox, W3DVX (K2-5373, K3-40)
570-478-0736 (cell, text)
http://amazon.com/author/alandwilcox 
Williamsport, PA 17701
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[Elecraft] P3 - TX Monitor

[N2TK, Tony]

After many months finally took the Direction Coupler out of the box and
hooked it up to my P3/K3. 
In the TXMon Menu I have the following:
Mte En - ON
Meter Scale - 2000W (I am using a 2KW Directional coupler and it is hooked
up properly.) 
Mod En - Off. If I turn it ON, the screen flashes.

The P3 screen shows the Modulation Scale, SWR meter scale and also the
digital PEP and SWR meters. But when I transmit none of the power meters  on
the P3 show anything.
I am getting power out on the LP-100. 
Any ideas on what I could be missing?

73,
N2TK, Tony


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Re: [Elecraft] ARRL book on receiving antennas

[Eric Swartz - WA6HHQ, Elecraft]

Folks, lets end this OT tread for now. It is well past our short term postings 
limit.

Also, do not leave all of the prior thread emails in your reply.  Delete most 
of the prior posts and only keep the absolute minimum needed in your reply to 
maintain context. That really helps reduce clutter and overload for our digest 
readers and als for those on slower connections. 

73,
Eric
Mooderator
elecraft.com
_..._



> On Sep 10, 2018, at 1:43 PM, Fred Jensen  wrote:
> 
> KFBK's are actually two, phased for day-night directional service.  Been 
> awhile 
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Re: [Elecraft] ARRL book on receiving antennas

[Fred Jensen]

KFBK's are actually two, phased for day-night directional service.  Been 
awhile since I saw them but the bottom insulators were maybe 10 ft above 
ground level [I'm 6'2" and it was just above my reach] so the feedpoint 
is a tiny bit higher than 1/4 wave.  1/2 wave at 1530 KHz is just over 
300 ft and the feed system at 50 KW is mechanically complex and pretty 
heavy.  I think [not sure where I read it but it was moderately 
recently] that KFBK's Franklin is the last AM broadcast one in NA.


NIST photos of WWV HF antennas show about the same height more or less.  
WWVH uses 2-element phased elements to put a cardioid null at the CONUS 
to reduce interference.  I would think that getting anything [including 
ground] farther out in the near field would reduce losses.  The choice 
is an engineering cost-benefit trade off of course.


73,

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

On 9/10/2018 11:41 AM, Jim Brown wrote:

On 9/9/2018 7:02 PM, Wes Stewart wrote:
The WWV antennas are center-fed vertical dipoles. 


Thanks for the reminder about this -- I vaguely remember reading about 
their antennas years ago.  Question -- from the description, is the 
feedpoint higher than a quarter wave above ground?  A few years ago, I 
did an NEC modeling study of HF verticals that showed that doing that 
improved the vertical pattern and seemed to suggest that it reduced 
ground losses. Your thoughts?


The study is here.  http://k9yc.com/VerticalHeight.pdf

73, Jim K9YC


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Re: [Elecraft] ARRL book on receiving antennas

[GWK]

We call it a "ground plane" antenna.

W3HBM

On 9/10/2018 2:48 PM, Walter Underwood wrote:

 From the official WWV site, the bottom element is a sloping skirt that also 
serves as guy wires. Sort of like a discone with the disc replaced by a 
vertical element, I guess.

"The top half of each antenna is a quarter-wavelength radiating element. The bottom 
half of each antenna consists of nine quarter-wavelength wires that connect to the center 
of the tower and slope downwards to the ground at a 45 degree angle. This sloping skirt 
functions as the lower half of the radiating system and also guys the antenna."

https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwv

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)


On Sep 10, 2018, at 11:41 AM, Jim Brown  wrote:

On 9/9/2018 7:02 PM, Wes Stewart wrote:

The WWV antennas are center-fed vertical dipoles.


Thanks for the reminder about this -- I vaguely remember reading about their 
antennas years ago.  Question -- from the description, is the feedpoint higher 
than a quarter wave above ground?  A few years ago, I did an NEC modeling study 
of HF verticals that showed that doing that improved the vertical pattern and 
seemed to suggest that it reduced ground losses. Your thoughts?

The study is here.  http://k9yc.com/VerticalHeight.pdf

73, Jim K9YC


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Re: [Elecraft] ARRL book on receiving antennas

[Walter Underwood]

>From the official WWV site, the bottom element is a sloping skirt that also 
>serves as guy wires. Sort of like a discone with the disc replaced by a 
>vertical element, I guess.

"The top half of each antenna is a quarter-wavelength radiating element. The 
bottom half of each antenna consists of nine quarter-wavelength wires that 
connect to the center of the tower and slope downwards to the ground at a 45 
degree angle. This sloping skirt functions as the lower half of the radiating 
system and also guys the antenna."

https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwv

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Sep 10, 2018, at 11:41 AM, Jim Brown  wrote:
> 
> On 9/9/2018 7:02 PM, Wes Stewart wrote:
>> The WWV antennas are center-fed vertical dipoles. 
> 
> Thanks for the reminder about this -- I vaguely remember reading about their 
> antennas years ago.  Question -- from the description, is the feedpoint 
> higher than a quarter wave above ground?  A few years ago, I did an NEC 
> modeling study of HF verticals that showed that doing that improved the 
> vertical pattern and seemed to suggest that it reduced ground losses. Your 
> thoughts?
> 
> The study is here.  http://k9yc.com/VerticalHeight.pdf
> 
> 73, Jim K9YC
> 
> 
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Re: [Elecraft] ARRL book on receiving antennas

[Jim Brown]

On 9/9/2018 7:02 PM, Wes Stewart wrote:
The WWV antennas are center-fed vertical dipoles. 


Thanks for the reminder about this -- I vaguely remember reading about 
their antennas years ago.  Question -- from the description, is the 
feedpoint higher than a quarter wave above ground?  A few years ago, I 
did an NEC modeling study of HF verticals that showed that doing that 
improved the vertical pattern and seemed to suggest that it reduced 
ground losses. Your thoughts?


The study is here.  http://k9yc.com/VerticalHeight.pdf

73, Jim K9YC


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Re: [Elecraft] Tuning band segments with the KPA-1500

[David Windisch]

Hi, all concerned:

Hmmm . . . OP Peter's post does not show up on my download of the nabble
reflector, but does appear on  the other reflectors.
Anyone else notice that?

Brgds, Dave, N3HE




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Brgds,
Dave, N3HE
Cincinnati OH
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Re: [Elecraft] KX3 SW ISSUE

[Petr, OK1RP/M0SIS]

Gerry,

I tested it on Snow Leopard as same as on High Sierra with 10.16.6.25 KX3
Utility and it works as it should.

Which kind of drivers are you using please?





-
73 - Petr, OK1RP 
"Apple & Elecraft freak" 
B:http://ok1rp.blogspot.com
G+:http://goo.gl/w3u2s9
G+: http://goo.gl/gP99xq
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Re: [Elecraft] searching for post by Wayne n6kr about counterpoise

[Petr, OK1RP/M0SIS]

Hi all,

everything works...
http://www.ok1rr.com/index.php/antennas/94-everything-works
;)





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73 - Petr, OK1RP 
"Apple & Elecraft freak" 
B:http://ok1rp.blogspot.com
G+:http://goo.gl/w3u2s9
G+: http://goo.gl/gP99xq
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