[Lowfer] UWL on

Tue Mar 16 16:37:01 EDT 2010

Hi, Paul.  The entire loading coil shows 6.3 mH on my dvm, but I'm not
sure what the inductance is from where I'm tapped on that.  I'll
measure that tonight and let you know.

I don't know what the capacitance to ground is.  How do I measure
that?  Simply with my dvm (that measures C)?  Or by some other means?
If with the dvm, then how exactly?  Just tell me how to do this and I
will give it a shot.

The antenna is just a 14 ga stranded wire.  The pole you see are fit-
together  sections that are each 44" when you subtract the overlap
part where they slide together.  Two of them are aluminum (I
think...at least a magnet won't stick to them) and the rest are
fiberglass.  The tophat uses #4 Cu radials and a copperweld halo.  The
#14 antenna wire is suspended from one of the radials near the center.

Please let me know about that C measurement, and I'll read the L
actually in use tonight on my coil.

Regarding the surroundings...well, it's not a forested area, but it's
not what most folks probably think Oklahoma is like either.
Surrounded by houses on 1/3 to 1/2 acre lots and treed.  There are 19
oak trees in my yard alone.

I _will_ get some pics posted of my station as promised.  Last night I
could leave my homemade dds alone.  I went to a multitasking OS on the
microcontroller which brought a few problems along with it (learning
curve) but I just can't leave it alone!  Everytime I think I have
decided to go back to the stand-alone code I make another advance with
the multitasking stuff.  I just can't leave it alone!! i have it all
working, just need to reduce memory consumption a bit in my floating
point display tasks...display being an LCD.  Check out http://freertos.org/
  if you are interested.  I'm using an Atmel AVR microcontroller, an 8
bit part, the ATmega1284p which has 128k of memory.

Eric KD5UWL / WD2XFX

On Mar 16, 2010, at 3:00 PM, Paul Daulton <k5wms at centurytel.net> wrote:

> A few details about the short verticle would satisfy my curiousity.
> 1. is it tubing or wire?
> 2. What is capacity to ground? How much inductance is required to
> load?
> 3. What are the surroundings? ie how close to trees and buildings.
>
> I used to work out well with an 18ft verticle from my camping
> trailer on 75
> meters.
>
> Eric and Lawrence have shown the practicality of less than ideal
> antennas.
> This is good material to recruit new comers to the lowfer bands.
>
> I want to try and shunt feed my HF tower. It is 36 to 40 ft tall
> with a
> Mosely TA33jr on top. It is free standing, bottom section is buried
> in the
> concrete bolted to pipes driven into the soil below the concrete. Any
> suggestions as to how to do this would be appreciated.
> ----- Original Message -----
> From: "Bill Ashlock" <ashlockw at hotmail.com>
> To: <lowfer at mailman.qth.net>
> Sent: Tuesday, March 16, 2010 1:37 AM
> Subject: Re: [Lowfer] UWL on
>
>
>>
>> A vertical that short is banking a lot on the ground system, Mike.
>> You can
>> only pull it off with that super-conductive mid-western soil :)
>> Wouldn't
>> work so well, especially at the lower frequencies, in this area
>> (particularly up north in the mountains) unless a counterpoise is
>> used.
>>
>> Bill
>>
>>> Date: Mon, 15 Mar 2010 19:39:06 -0500
>>> From: we0h at gmx.com
>>> To: lowfer at mailman.qth.net
>>> Subject: Re: [Lowfer] UWL on
>>>
>>> Mini verticals do work no matter what band they are used on. We
>>> have a
>>> fellow in Iowa on 600 meters who uses a 20' tall vertical with a
>>> hat and
>>> covers the country just fine with 100w. His local signal is very
>>> strong
>>> also. Note the micro sized vertical used on 8.97kc today in
>>> Germany and
>>> the distance covered with a little over 100w...
>>>
>>> Mike
>>> WE0H
>>>
>>>
>>>
>>>
>>>
>>>
>>> Eric S wrote:
>>>> That's all I could manage, Bill, with reasonable effort.  But I've
>>>> never had one any taller and I've always managed to do the things I
>>>> want to try with them.
>>>>
>>>> How's that SVM coming along?  Mike and I still would each like to
>>>> beta
>>>> test one for you :)
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>
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