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Search: Posts Made By: GroundUrMast
Forum: Enthusiast's Exchange 9-Apr-2012, 8:27 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
The answer varies from one Enthusiast to...

The answer varies from one Enthusiast to another... This is the Enthusiast Exchange forum after all.

Some may have the misguided notion that they could save money (but I've built several from...
Forum: Enthusiast's Exchange 23-Nov-2011, 5:48 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
Some of the older information I've come across...

Some of the older information I've come across includes descriptions of a dual stack in which the upper and lower sections are tied together with a piece of open wire or twin lead and the...
Forum: Enthusiast's Exchange 10-Nov-2011, 1:31 AM
Replies: 17
Views: 71,923
Posted By GroundUrMast
My recent attempts to use 4NEC2 confirm that 27...

My recent attempts to use 4NEC2 confirm that 27 dB is quite 'optimistic'.

Gain of 16 to 18 dBi (free space) is a reasonable target for the 'dual-coplanar Laport' design.

The following 4NEC2...
Forum: Enthusiast's Exchange 7-Jun-2011, 9:02 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
The older documentation on rhombic antennas often...

The older documentation on rhombic antennas often comments on the low SWR over a fairly wide frequency range (2:1 is referred to as I recall), that is not an indication constant forward gain though. ...
Forum: Enthusiast's Exchange 7-Jun-2011, 8:32 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
Thanks Dave. Please note that the PDF has...

Thanks Dave.

Please note that the PDF has been updated to indicate the computer modeling work you have cited.

Still, gain in excess of 16 dBi for any home built antenna is very remarkable.
Forum: Enthusiast's Exchange 17-May-2011, 8:30 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
Advanced Rhombic Design

The attached drawing is based on the work of Edmund A. Laport and descriptions of his work from an article published in CATJ, October 1976. I specifically scaled this drawing to UHF channel 46.
...
Forum: Enthusiast's Exchange 27-Mar-2011, 7:14 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
Notice that "Enthusiast's Exchange" is at the...

Notice that "Enthusiast's Exchange" is at the bottom of the list of forums.

Enthusiast's Exchange could be code for 'the place for kids with pocket protectors and those who wish they were'. :D
...
Forum: Enthusiast's Exchange 26-Mar-2011, 10:09 PM
Replies: 17
Views: 71,923
Posted By GroundUrMast
Here is some additional information, including a...

Here is some additional information, including a link to "Edmund Laport's textbook Radio Antenna Engineering, published in 1952 and now out of copyright and freely available, scanned and processed...
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