[Antennas] Short ground radials

Sun, 12 Jan 2003 15:08:00 +0200

  Hi guys! A propos radials: radials are suppoesd to extend from the antenna
base to a minimum distance of one quarter wavelength. It doesn't have
anything to do with electrical lenfth, but with free space dimensions.
Ground laid radials are intended to separate between the lossy ground and
the antenna, by providing a lower loss return path for the antenna currents,
thus free space dimensions. For an elevated radial system shortening the
radials will incur some losses, but smaller that for a ground level
installation. All in all, if you can't avoid it use it, but with tongue in
cheek.
		73 and all the best:
			Alex	4Z5KS

-----Original Message-----
From: Charles Greene [mailto:[email protected]] 
Sent: Sunday, January 12, 2003 2:37 PM
To: [email protected]
Cc: a
Subject: Re: [Antennas] Short ground radials

Ron and All.

You can use shortened radials and load them with an inductor.  Ref: Moxon, 
HF Antennas for All Locations, or model it using EZNEC.  A single inductor 
will resonate all the radials which can be connected together but not 
connected to the coax shield.  In fact, if you structure the antenna 
properly, a single coil at the base will resonate both the radials and the 
radiator.  I modelled it and then built one.

At 03:21 AM 1/12/2003 +0000, Ronald KA4INM Youvan wrote:
>>I was wondering... If one can make a "short dipole" with the use of 
>>loading coils.
>
>
>   Yes, a stinger at the end should increase efficiency.
>  (not all coil, see ham stick)  (twice in this case)
>
>>Could one also use loading coils to shorten the ground radials of an 
>>vertical antenna?
>
>
>   No, the radials are more reflectors.

73, Chas, W1CG
K2 #462

- - - 

Your moderator for this list is:
Larry Wilson KE1HZ [email protected]
_______________________________________________
Antennas mailing list
[email protected] http://mailman.qth.net/mailman/listinfo/antennas

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.435 / Virus Database: 244 - Release Date: 30/12/02

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.435 / Virus Database: 244 - Release Date: 30/12/02