Tasty » Adam Sampson's hf bookmarks

Main Page - HF Underground edit / delete

Wiki for shortwave listeners; lots of interesting stuff about commercial, beacon and pirate stations.

to beacon hf pirate radio shortwave swl ... on 30 October 2010

PSK Automatic Propagation Reporter edit / delete

Show who's being heard where on PSK. fldigi can talk to it.

to digimodes ham hf psk radio ... on 23 October 2010

A Hexbeam in 3 hours edit / delete

Cute. I find myself wanting to hang washing on it, though.

to antenna hf radio ... on 01 October 2010

EH antenna homepage edit / delete

More analysis. The basic stuff is interesting, but then it... stops.

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

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