[Lowfer] [part15] Beacon & quot; XR & quot; antenna photos

[Paul Daulton]

   Looks like you are correct. The Q you calculate is unloaded Q. I 
wanted to compare mine to yours, but my DVM wont work on low scale. I 
will measure res when I can find another meter and compare readings to 
yours. 

   I need to back calculate your coil dimensions and come up with the 
no of turns and check wire tables for res/1000ft. Seems like I did this 
once before and came up with 24awg. 

   Its been about 4 years since I have been throught the calculatons so 
I will have to review the hand book and get back to you. 

   Thanks

Quoting Andy - KU4XR :

   Paul and list:

Math certainly isn't my strong point, so I may really mess this
up. First, the measured coil resistance is 5.8 Ohms, and the
measured Inductance when peaked for max RF - I is 2.24 mH
Now how accurate are my calculations ?

Xl = 2pi * F * L :: 6.28 * 185298.66 * 2.24 = 2606.63 Ohms

Q = Xl / R :: 2606.63 / 5.8 = 449.41 ???? How bad off am I ??

Coil winding is 2 inches high. 

This is now getting into the stuff that causes Brain Bog :)

Andy - KU4XR - EM75xr - Friendsville, TN. 
LOWfer Beacon " XR " @ 185.29866 KHz ( QRSS-60 )
Coordinates: N: 35* 43' 54" - W: 84* 3' 16"
http://www.myspace.com/beaconxr

--- On Mon, 11/9/09, Paul Daulton  wrote:

> From: Paul Daulton Subject: Re: [Lowfer] [part15] Beacon " XR " 
> antenna photos
> To: part15 at yahoogroups.com, lowfer at mailman.qth.net
> Date: Monday, November 9, 2009, 10:19 PM
>
>
>    ,NIce pictures. Your trailer should serve
> as a good ground plane. Bonding panels together may help. Seems like 
> I read where
> DEX and LYLe mounted thier lowfer antennas over metal barn roofs.    
> Cant understand how you did it without
> Duct Tape.    Q= Xl/R. Can you measure resistance of
> coil with DVM and measure inductance( then calculate Xl. I believe 
> improving the q of
> your coil either by larger conductor or more correct dia/length ratio
> would be next best place to improve.Best d/l ratio is 2.5. I judge
> the length of your coil to be about 1.5 inch. A wire size that will give
> the needed inductance with a length of 6 inch on the paint bucket
> would be ideal . Measure R and Xl and let us know the values. Both on
> present inductor and any future changes.    Extend right hand over 
> left sholder and
> give yourself a pat on the back for me.    Paul K5wms
>
> Quoting Andy - KU4XR :
>
>    Hi all:
>
> I uploaded the antenna project photos today. The easiest
> link to view the photos is:
>
> http://webpages.charter.net/ku4xr/%22%20XR%20%22%20Antenna%20project/
>
> 73 :::
>
> Andy - KU4XR - EM75xr - Friendsville, TN. LOWfer Beacon " XR " @ 
> 185.29866 KHz ( QRSS-60 )
> Coordinates: N: 35* 43' 54" - W: 84* 3' 16"
> http://www.myspace.com/beaconxr
>
>
> Paul Daulton K5WMS
> beacon WMS 187.492 khz qrss30/slow 24/7
> Jacksonville,Ar 72076
> em34wu
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Paul Daulton K5WMS
beacon WMS 187.492 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu