Menu

Dual rhombic antenna

Search this Thread

#1

Report Post

Old

March 22nd 06, 02:00 AM posted to rec.radio.amateur.antenna

[email protected]

Posts: n/a

Default

Dual rhombic antenna

wrote:
I picked up a Oct 1973 issue of 73 & noticed a interesting article on
a mast mounted rotatible very
hig gain 435mhz antenna, cheap and easy to built. Ive been trying to
build a high gain antenna to
recieve ATV in the 903-928 band & seems this maybe the one. The claims
for
this antenna seem streached abit, they claim 26dB gain from just wire
and a few resistors

You might try modeling the antenna or rading a textbook that covers
real Rhombic antennas.

Antennas and Transmission Lines by John (jack) Kuecken is a great
place to start.

I think what you will find is that gain figure is extremely inflated.
It is unobtainable in the real world. I'd expect more like 15dBd
maximum gain if you can do almost everything perfectly, and you might
squeek another 3dB with two Rhombics in optimum configuration.
At the old VOA installations, the very large Rhombic antennas had less
gain than curtain antennas that occupied much less space.

I have a 300 foot tall support. I've been trying to model an Inverted V
or V beam with useful gain over a small Yagi without success. If
anyone has sucessfully modeled one, please let me know.

73 Tom

I've been

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 Hybrid Mode Switch to 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
Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?	Bob Miller	Shortwave	40	September 3rd 12 02:15 PM
Passive Repeater	Bryan Martin	Antenna	13	February 10th 06 02:03 PM
On Topic	[email protected]	Shortwave	5	November 2nd 05 10:35 AM
ABOUT - Making a SWL Antenna out of 300 Ohm Twin Lead and TV Coax Cable	RHF	Shortwave	0	October 28th 05 12:22 PM
The "Almost" Delta Loop Antenna for Limited Space Shortwave Listening (SWL) made from TV 'type' Parts	RHF	Shortwave	0	October 16th 05 12:34 PM

All times are GMT +1. The time now is 12:17 AM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017