Tasty » Adam Sampson's hf bookmarks

Radiating feeder: Applying a theory. edit / delete

More Microvert/EH analysis, with suggestions on taking advantage of feedline radiation.

to aerial amateur eh hf microvert radio small-aerial ... on 09 January 2010

The DL7PE-MicroVert edit / delete

Another small HF aerial design, but this one's explicitly designed to use the download as a counterpoise. This appears to be the approach that Firestik's no-ground-plane antennas use. The PDF gives all the design equations, which is nice.

to aerial amateur hf microvert radio small-aerial ... on 09 January 2010

THE EH ANALYZED edit / delete

Modelling EH antennas using SPICE. This produces some interesting results.

to aerial amateur eh electronics hf isotron modelling radio small-aerial spice ... on 09 January 2010

ZL1CLG edit / delete

Building EH antennas from the sort of "components" that, say, Wilkinsons sell. (And more speculation about how they work.)

to aerial amateur eh hf radio small-aerial ... on 09 January 2010

Site of Lloyd Butler VK5BR edit / delete

And this is someone who has some serious clue about antenna design playing with the EH/Isotron approach -- on the X2/X3 pages, he's doing experiments to figure out how it actually works, and what you need to do to make it work well. The results are nonobvious.

to aerial amateur eh hf isotron radio small-aerial ... on 09 January 2010

L'ANTENNE ISOTRON edit / delete

Right, this is more interesting: this guy twigged that the Isotron and EH antennas look like they're operating on similar principles, and came up with a simpler design drawing on both, which can be homebrewed with some plastic pipe and old hard disk platters (!). Looks like it works well. There's a PDF here giving simple instructions for building the CB version.

to aerial amateur cb eh hf isotron radio small-aerial ... on 09 January 2010

Isotron edit / delete

DIY clone of the commercial Isotron antennas. They are unimpressed with the performance.

to aerial amateur cb hf isotron radio small-aerial ... on 09 January 2010

Build the EH STAR Antenna for 27 MHz Packet Radio edit / delete

Building an EH antenna for CB use. He suggests it works all right, but it's very sensitive to the downlead placement -- i.e. it's using the downlead as a radiator.

to aerial amateur cb eh hf packet radio small-aerial ... on 09 January 2010

EH Antenna Systems edit / delete

More commercial small-space antennas, although this is definitely from the wackier end of the experimental radio spectrum, and nobody agrees with *their* explanation of how they work. (Don't miss the paper that mentions in passing that they think they should get a Nobel prize in physics for the design!)

to aerial amateur eh hf radio small-aerial ... on 09 January 2010

Isotron Antennas - Low Profile Limited and Restricted Space Antennas for HF edit / delete

Commercial HF antennas of unusual design. They get good reviews, although people can't agree on how they work. Pretty, but expensive and not very weatherproof.

to aerial amateur hf isotron radio small-aerial ... on 09 January 2010