The Doublet Antenna & Ladderline

Ever thought about a Doublet Antenna? Just why do you have to use ladderline instead of coaxial cable if you want to use multiple bands with one centre fed dipole?

Here's a look at why...





Comments

Post a Comment

Popular posts from this blog

MULTI-BAND ANTENNA FOR A SMALL SPACE/GARDEN

Image
  A Multi-band Home-brew Antenna in a Small Garden or a Newcomer to HF   A Typical Dilemma: So you have just passed your Foundation Exam and/or you live in a typical small British garden in an urban or semi-rural setting. You have no room for a full-sized 40 metre dipole (even in an inverted-v configuration). Maybe you have tried a vertical antenna such as one fed with a 9:1 UNUN but found it noisy and not a great radiator of your much-prized RF? Or you are tempted to spend a few hundred pounds on that shiny new multiband (no radials) vertical that would surely become your solution?   Such all-band off-the-shelf verticals are easily obtainable and can work well. However, many newly qualified operators are faced with two major obstacles with these antennas:   1. Price: typically ranges from around £200 to beyond £500.   2. The need for radials: Many manufacturers and sellers will maintain that you can work these vertical antennas without radials. Yo...
Read more

END-FED HALF WAVE ANTENNA FOR PORTABLE or SMALL SPACE USE

Image
  In my quest to find a convenient multi-band solution to operating HF portable I have tried several configurations, including the venerable linked-dipole for 40/20metres and full sized 20-metre-long end-fed half wave antennas. The selection of Ampro-whip antennas I own perform well from 14 MHz and upwards but become a true compromise from 7MHz and below.   My interest in using 40 metres portable has necessitated the need to use full sized half-wave antennas in both of the above mentioned configurations, which in turn requires the use of a good deal of space to accommodate a 67 foot long antenna. The safety aspect, ensuring that high voltage end points are kept above head height, means that I often need 80 feet or more of space to run an antenna portable for 7 MHz.   Those of us who operate portable have probably experienced the difficulties faced with utilising this much space. Hill-tops and beach-side locations are often used by other people and this leads to issues...
Read more

Loop Antenna 80 metres to 10 metres

Image
Thanks again to Rick, DJ0IP for publishing details of this antenna which he says provides great gain at higher angles for 80 and 40 metres as well as very good gain 20 metres through 10 metres. Let’s use MMANA-gal modelling to see if this agrees. Check out Rick’s website here: https://www.dj0ip.de/my-favorite-ante... Connect with my channel by subscribing and commenting.
Read more