Dia dhuit*, 您好, Hola, Hello, नमस्कार, مرحبا
Opa!, নমস্কার, Привет!, 今日は, Halo **

cormac EI4HQ

May 2018: Now that major upgrade work on the antenna farm and shack is finally nearing completion (delayed by the worst Winter we've had in Cork in living memory), I've started work on this site in earnest. At this stage I'm simply putting in placeholders for the veritible mountain of information that will appear here over the next 6 months or so. Once I've a complete list of contents up, I'll then get stuck into writing the articles and uploading the data, files, pictures etc. In the meantime, if you need anything, just drop me an email at ei4hq.mail@gmail.com and if you're interested in keeping tabs on what I'm up to, take a look on Twitter; @EI4HQ

I'm Cormac (Gebruers) and I'm a radio experimenter. It's very nice to meet you. My callsign - EI4HQ - indicates that I've completed a formal course of radio study and passed an exam to become a licensed radio amateur. I've done this so I can get even more enjoyment from my interest in radio. My amateur radio license enables me to usefully, safely and legally make radio transmissions on a wide range of radio frequencies set aside Worldwide for radio experimentation. A good place to start to learn more about amateur radio and licensing where you are is the International Amateur Radio Union (IARU) website. I refer to myself as a radio experimenter and not amateur as in my working life as a researcher and product innovator, I work a lot with radio and related technologies. I'm particularly interested in the use of Software Defined Radio (SDR) in maritime sensing and communications applications. On this site you'll find information related to both my hobby and professional radio activities. I hope you find some of it interesting and useful.

Radio is diverse interest with many different aspects to it. My own specific interests are:

  • How radio waves travel from one place to another, a phenomenon known as propagation. Propagation is wonderfully complicated and there remain aspects that are not yet fully understood nor explained. My propagation interests are predominantly focussed on frequencies below 30MHz and at 9.5Ghz (x-band radar). The table below summarises current propagation conditions and gives a forecast for the HF (high frequency) amateur radio bands:
  • The technical and operating challenges of communicating by radio, particularly where signals are very weak (for whatever reason). This is part of but by no means all of the hobby of amateur radio
  • Two specific aspects of weak signal work that I particularly enjoy are communicating with very low power radio transmissions - in amateur radio this is known as QRP - and exploring the Universe at radio frequencies. This is radio astronomy, the detection of naturally ocurring radio signals generated by planets, stars and other objects in the Universe
  • Software Defined Radio, particularly for weak signal detection
  • Building radio equipment, particularly antennas (the most important of radio equipment bar none!). In radio circles making equipment is often called homebrewing
  • Amateur radio contesting (also called radiosport). This activity is a bit hard to describe to the uninitiated but you can get a sense of it here
  • The particular challenges of communicating with other radio amateurs over long distances and in countries that are hard to contact. This aspect of the hobby is called DXing. You can learn more about it here.

*Hello in the Irish language. ** Hello in the World's 10 most spoken languages; 1. Chinese, 2. Spanish, 3. English, 4. Hindi, 5. Arabic, 6. Portugeuse, 7. Bengali, 8. Russian, 9. Japanese and 10. Javanese. Source Ethnologue