About Us

John S · November 6th 14, 04:22 PM posted to rec.radio.amateur.antenna

On 11/6/2014 7:16 AM, amdx wrote:
On 11/5/2014 1:08 PM, wrote:
On Wednesday, November 5, 2014 1:01:02 PM UTC-6,

I would think a dipole would be a bad candidate for a "short" antenna
as you need to get the matching stuff close to the antenna to avoid
I^2R losses.

I'd probably use small matching coils at the feed point, about the
same as a mobile antenna.
In the real world, I try to avoid short antennas..
It's only a last resort due to lack of room. I rarely actually use one.

OK, nuff jabbering.
I'll set the rules 15ft tall, designed for 80 meters.
16 radials, base mounted inductor and whatever tophat you desire.
Do the theoretical design find the feed impedance with some efficiency
numbers.
Then compare data to a dipole at 1/4 wave height.

Ready Set GO!

Wait, do you have a better idea than a base mounted inductor?
How long are the radials?
Do you want to compare 8 to 16 radials.
The tophat needs to survive 80 mile an hr wind.
I'm sure there's more.

Mikek

What wire material/size? Some stainless steel rods might have a
permeability that will reduce the efficiency. It will certainly have a
higher resistance than copper. Also note that copper-clad steel must
have a cladding several times the skin depth for high efficiency.

John

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
LF Antenna Design	rickman	Homebrew	12	December 2nd 12 11:42 PM
LF Antenna Design	rickman	Antenna	11	November 26th 12 09:25 PM
New antenna design	Art Unwin	Antenna	36	September 6th 09 08:04 AM
Short 80m antenna, suggestions??	MD	Antenna	18	August 17th 05 01:08 AM
Short lot 80 and possible 160 antenna suggestions	Rick Scott	Antenna	6	January 31st 05 07:53 PM

Menu

About Us