The trials are over and the results are in.
During the trials I did some ingress tests with the ESB.
The ESB published a powerpoint presentation on the PLT trials here
Here is a Copy of my ingress report as submitted to the ESB shortly after the ingress tests
The Irish Powerline internet trials have begun in a Town called Tuam in North Co, Galway.
On the 7th of April 2004 I visited the trial area.
It seems that the laws of physics apply to powerlines in Ireland too, Very high levels of interference to HF radio was found in the trial areas.
The system used by the ESB in the trial area
is an OFDM type system with discreet carriers approximately
every 1.1 Khz and is identical in characteristics to the system
in the ARRL trial area #4
This may point to it being a DS2 system or a system using the DS2 chipset.
In the areas where I could detect significant levels of PLC
signals the following frequency ranges were in use.
18880 - 22745 Khz. Signals in the 15m band and the broadcast band
starting at 21450 Khz were up to s9+60dB and never went below s9 at
any of the carrier frequencies. Several very strong broadcast
stations were audible but in all cases the interference to reception
was severe, I followed this system along the lines into town.
Reception was on a vertical mobile whip
2720 to 5870 Khz, Signals in the 80m band were in excess of s9, up
to s9+20dB or so as received on an inefficient vertical mobile whip.
It was impossible to hear any amateur stations above the noise.
You can find out more about the impact of PLT on HF radio on the following web sites
The ARRL have a PLT page here
Peter Cochrane has this to say on the subject of PLT
Here (290KB PDF file) is an interesting economic analysis of the financial viability of PLT done by Carnegie Mellon University in the US, it's fairly full of economist speak but if true points to the financial viability of PLT for the operators being marginal to say the least.
The national society representing Amateur radio in Ireland is theIRTS ( Irish radio transmitters society )
This page is at a very preliminary stage of construction, please
feel free to contact me with corrections and suggestions for
I am Brendan Minish, EI6IZ and I can be contacted by E-mail firstname.lastname@example.org