About Jean-Paul Suijs - PA9X

Jean-Paul. Radio amateur, VERON member. HF, radiowaves, propagation, antennas. Amateur astronomer. Principal Marketeer. Rotterdam Port area, JO21ev.

The Hula Hoop Halo; a simple DIY antenna for 6 meter band DX

There is no other band that is affected by as many forms of propagation as 6m (50 MHz). Sporadic-E (Es) in summer and winter. TEP (transequatorial propagation) around March/April and September/October. F2 propagation and aurora in periods of high solar activity. Meteorscatter and the almost daily present troposcatter. But even Continue reading The Hula Hoop Halo; a simple DIY antenna for 6 meter band DX

How to build a limited space 10 and 20 meter band Square Halo DX antenna

Better horizontally than vertically polarized If you only have limited space for an antenna, but still want to DX on HF on multiple bands, you will soon have to rely on a vertical antenna. DX’ers among us know that on the 10 and 20 meter band you can often work Continue reading How to build a limited space 10 and 20 meter band Square Halo DX antenna

How the replacement of solar panel micro inverters lead to 50 dB less QRM

Past time my focus was on resolving the interference caused by neighbors’ two solar panel installations. Last year I bought a QRM eliminator with which I, in combination with a Miniwhip active antenna as auxiliary antenna, achieved good results on a decent part of the HF spectrum. But the interference Continue reading How the replacement of solar panel micro inverters lead to 50 dB less QRM

Is your antenna making noise? Use a rope!

In most cases, radio amateurs love it when their antenna resonates, because a resonating antenna is usually an efficiently radiating antenna. At least, when we talk about electrical resonance and not acoustic resonance. The latter can cause considerable nuisance and even dangerous situations. Fortunately, there is an effective and inexpensive way to keep Continue reading Is your antenna making noise? Use a rope!

Boost your QRM eliminator performance with an active antenna

In a previous post I did a review on the X-phase QRM eliminator. I found out that the antenna for receiving QRM, the auxiliary or secondary antenna, holds the key to optimum performance of the QRM eliminator. A single wire along a shelf in your shack is, for what I Continue reading Boost your QRM eliminator performance with an active antenna