Menu

Endfeed vertical halfvawe antenna

Search this Thread

Prev

Previous Post

Next Post

Next

#18

Report Post

Old

September 16th 06, 09:14 PM posted to rec.radio.amateur.antenna

Tom Donaly Tom Donaly is offline

Tom Donaly is offline

external usenet poster

First recorded activity by RadioBanter: Jul 2006

Posts: 274

Default

Endfeed vertical halfvawe antenna

wrote:
On Sat, 16 Sep 2006 17:41:01 GMT, "Harold E. Johnson"
wrote:

The simplest fed is a L network with the C at the transmitter end
and the antenna at the unterminated inductor end. Works best
in the radiator is slightly capacitive looking.

Specificallly check the article "feeding the EDZ" as that
talks about the problem at hand.

Allison

Not really, the capacitor goes on the end of the coil closest to the higher
impedance. I'm certain his half wave will be appreciably above 50 Ohms.
Mine's about 2600 Ohms.

W4ZCB

You must have missed the second sentence where I state at
resonance It's a high resistance. I think we agree.

""For a "half wave" fed at the end the sign of the reactive part will
vary depending on it's real length. If it's really resonant there is
no reactive component only a very high resistive one. ""

However in a few cases I found the radiator and mountings to be
capacitive enough to result in no additional capacitance needed.
We agree but implementation sometimes takes other forms.

One of the sites posted suggests a PI network and again with the right
values it's the most flexiable and offers a low pass characteristic
that never hurts.

Allison

How do all these various matching schemes affect bandwidth?
73,
Tom Donaly, KA6RUH

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vertical radiation from horizontal dipole?	lu6etj	Antenna	14	August 23rd 06 07:24 PM
Question is 'it' a Longwire {Random Wire} Antenna -or- Inverted "L" Antenna ?	RHF	Shortwave	5	November 6th 05 04:52 AM
Workman BS-1 Dipole Antenna = Easy Mod to make it a Mini-Windom Antenna !	RHF	Shortwave	0	November 2nd 05 11:14 AM
Questions -?- Considering a 'small' Shortwave Listener's (SWLs) Antenna	RHF	Shortwave	1	January 24th 05 09:37 PM
Ideas for a homemade mobile antenna.	Chris	CB	152	June 24th 04 02:13 AM

All times are GMT +1. The time now is 12:08 PM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017